docs: cut v0.19.0 — punch-list close + Wayland + animation polish

Promotes [Unreleased] to [0.19.0]. The release closes v0.18.0's
punch list (async H-key hint, persistent replay share URLs),
expands desktop platform fit (Wayland session support +
monitor-aware default window size), polishes the win-celebration
and double-click animation paths, and clears two test-flake
contributors. The Rusty Pixel pixel-art card theme arc was
prototyped and reverted in the same window — the engine plumbing
(pixel_art ThemeMeta field, PNG manifest face support, second
embedded:// theme channel) was fully reverted and is not part of
this release.

SESSION_HANDOFF.md refreshed to reflect the v0.19.0 ship:
v0.18.0 punch-list items B and D marked shipped; new Open punch
list documents the Rusty Pixel arc as historical, calls out the
desktop-packaging follow-through (app icon next), the
pull_failure_sets_error_status flake (next-round candidate),
and a settings-UI item for the smart-default-size opt-out.
Resume prompt refreshed with the post-v0.19.0 A-D decision menu.

Build: cargo clippy --workspace --all-targets -- -D warnings clean.
Tests: 1170 passing / 0 failing.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.gitignore

@@ -1,4 +1,5 @@
 /target
+/.sccache-cache
 *.db
 *.db-shm
 *.db-wal

.sqlx/query-3a9bd2e51b2389da5b7e85f26806fcffa896748e0b589d216cf60827fc3857a9.json

@@ -0,0 +1,68 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT\n              r.id              AS \"id!: String\",\n              u.username        AS \"username!: String\",\n              r.seed            AS \"seed!: i64\",\n              r.draw_mode       AS \"draw_mode!: String\",\n              r.mode            AS \"mode!: String\",\n              r.time_seconds    AS \"time_seconds!: i64\",\n              r.final_score     AS \"final_score!: i64\",\n              r.recorded_at     AS \"recorded_at!: String\",\n              r.received_at     AS \"received_at!: String\"\n           FROM replays r\n           JOIN users   u ON u.id = r.user_id\n           ORDER BY r.received_at DESC\n           LIMIT ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "id!: String",
+        "ordinal": 0,
+        "type_info": "Text"
+      },
+      {
+        "name": "username!: String",
+        "ordinal": 1,
+        "type_info": "Text"
+      },
+      {
+        "name": "seed!: i64",
+        "ordinal": 2,
+        "type_info": "Integer"
+      },
+      {
+        "name": "draw_mode!: String",
+        "ordinal": 3,
+        "type_info": "Text"
+      },
+      {
+        "name": "mode!: String",
+        "ordinal": 4,
+        "type_info": "Text"
+      },
+      {
+        "name": "time_seconds!: i64",
+        "ordinal": 5,
+        "type_info": "Integer"
+      },
+      {
+        "name": "final_score!: i64",
+        "ordinal": 6,
+        "type_info": "Integer"
+      },
+      {
+        "name": "recorded_at!: String",
+        "ordinal": 7,
+        "type_info": "Text"
+      },
+      {
+        "name": "received_at!: String",
+        "ordinal": 8,
+        "type_info": "Text"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      true,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false,
+      false
+    ]
+  },
+  "hash": "3a9bd2e51b2389da5b7e85f26806fcffa896748e0b589d216cf60827fc3857a9"
+}

.sqlx/query-5bc1984044bc792c2e9577a159ca22789469df14cb25144451f37e8cdad8165c.json

@@ -0,0 +1,20 @@
+{
+  "db_name": "SQLite",
+  "query": "SELECT replay_json FROM replays WHERE id = ?",
+  "describe": {
+    "columns": [
+      {
+        "name": "replay_json",
+        "ordinal": 0,
+        "type_info": "Text"
+      }
+    ],
+    "parameters": {
+      "Right": 1
+    },
+    "nullable": [
+      false
+    ]
+  },
+  "hash": "5bc1984044bc792c2e9577a159ca22789469df14cb25144451f37e8cdad8165c"
+}

.sqlx/query-6a36a96faa9d9b423aae3b72b0c049a1489b67ca2361581b2300bb4ee0bc9e2f.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT INTO replays (\n              id, user_id, seed, draw_mode, mode, time_seconds, final_score,\n              recorded_at, received_at, replay_json\n           ) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 10
+    },
+    "nullable": []
+  },
+  "hash": "6a36a96faa9d9b423aae3b72b0c049a1489b67ca2361581b2300bb4ee0bc9e2f"
+}

ARCHITECTURE.md

@@ -47,11 +47,10 @@ Solitaire Quest is a cross-platform Klondike Solitaire game written in Rust, tar
 ### Design Principles
 
 - **Offline first.** The local file is always the source of truth. Sync is additive, never destructive.
-- **Pure core.** All game logic lives in a dependency-free Rust crate with no Bevy, no network, and no I/O. This keeps it fully unit-testable and portable.
-- **No panics in game logic.** Every state transition returns `Result<_, MoveError>`. Panics are only acceptable in startup/configuration code.
 - **One language, one repo.** The game client, sync client, shared types, and sync server are all Rust crates in a single Cargo workspace.
 - **Plugin-based Bevy architecture.** Each major feature is a Bevy `Plugin`. Systems are small and single-purpose. Cross-system communication uses Bevy `Event`s.
-- **UI-first interaction.** Every player-triggered action — new game, undo, draw, pause, open stats / settings / help / profile / leaderboard, etc. — must be reachable from a visible UI control. Keyboard shortcuts exist only as optional accelerators for power users; they are never the sole entry point. A player using only mouse or touch must be able to perform every action. New gameplay features ship with the UI control alongside the system that backs it.
+
+Pure-core, no-panics-in-game-logic, and UI-first-interaction constraints are enforced by CLAUDE.md §2.1, §2.3, and §3.3 respectively — those are the canonical statements; this file describes the design that motivates them.
 
 ---
 
@@ -70,8 +69,8 @@ solitaire_quest/
 │
 ├── assets/                     # Loaded at runtime via AssetServer (audio is embedded via include_bytes!())
 │   ├── cards/
-│   │   ├── faces/{RANK}{SUIT}.png   # 52 card faces — xCards @2x artwork (LGPL-3.0)
-│   │   └── backs/back_0.png – back_4.png    # back_0 = xCards bicycle_blue; back_1–4 are generated patterns
+│   │   ├── faces/{RANK}{SUIT}.png   # 52 card faces — rendered from hayeah/playing-cards-assets SVGs (MIT)
+│   │   └── backs/back_0.png – back_4.png    # back_0 = generated default back; back_1–4 are generated patterns
 │   ├── backgrounds/bg_0.png – bg_4.png      # generated textures
 │   ├── fonts/main.ttf          # FiraMono-Medium (170K, OFL)
 │   └── audio/
@@ -716,11 +715,14 @@ pub struct AchievementDef {
 | `speed_and_skill` | ??? | Win < 90s without undo | Yes | Card back #4 |
 | `comeback` | ??? | Win after 3+ stock recycles | Yes | Background #4 |
 | `zen_winner` | ??? | Win in Zen Mode | Yes | Badge |
+| `cinephile` | Cinephile | Watch a saved replay all the way through | No | — |
 
 ### Evaluation Timing
 
 Achievement conditions are evaluated by `AchievementPlugin` on every `GameWonEvent` and `StateChangedEvent`. The plugin calls `solitaire_core::check_achievements()` which returns a `Vec<AchievementDef>` of newly unlocked achievements. The plugin then fires `AchievementUnlockedEvent` for each, which the toast and persistence systems handle independently.
 
+A small number of achievements are *event-driven* rather than condition-driven: their `AchievementDef::condition` always returns `false` and their unlock is written from a dedicated observer system instead. `cinephile` is the canonical example — it unlocks when `ReplayPlaybackState` transitions from `Playing` to `Completed` (a saved replay watched to its natural end). The Stop button transitions `Playing → Inactive` directly without entering `Completed`, so manual aborts do not unlock the achievement.
+
 ---
 
 ## 12. Progression System
@@ -1009,5 +1011,7 @@ Using `axum::test` and an in-memory SQLite database:
 | `SyncProvider` trait, not `SyncBackend` match arms | `SyncPlugin` stays backend-agnostic and testable; new backends can be added without touching the plugin | 2026-04-20 |
 | Dropped WebDAV backend | Redundant once the self-hosted server exists; removing it reduces surface area and simplifies settings UI | 2026-04-20 |
 | Dropped GPGS backend | Redundant with the self-hosted server; adds JNI complexity for no user-visible benefit on the target platforms | 2026-04-28 |
-| Card, background, and font assets loaded via `AssetServer` | Reverses the earlier embed-via-`include_bytes!()` decision: PNGs and TTFs are loaded at runtime so artwork can be swapped (e.g. xCards @2x faces, alternate card backs, themed backgrounds) without a recompile, and binary size stays small. Loaders take `Option<Res<AssetServer>>` and fall back gracefully under `MinimalPlugins`. The `assets/` directory must ship alongside the binary. | 2026-04-29 |
+| Card, background, and font assets loaded via `AssetServer` | Reverses the earlier embed-via-`include_bytes!()` decision: PNGs and TTFs are loaded at runtime so artwork can be swapped (e.g. alternate card backs, themed backgrounds) without a recompile, and binary size stays small. Loaders take `Option<Res<AssetServer>>` and fall back gracefully under `MinimalPlugins`. The `assets/` directory must ship alongside the binary. | 2026-04-29 |
 | Audio assets remain embedded via `include_bytes!()` | Audio files are small, change rarely, and the embedded path eliminates a class of runtime-load errors during gameplay; the asset-pipeline reversal does not extend to audio | 2026-04-29 |
+| Card art swapped from xCards (LGPL-3.0) to hayeah/playing-cards-assets (MIT) | Public-release readiness. The previous xCards art carried LGPL relinking obligations that complicate a single-binary distribution; hayeah's set derives from the public-domain `vector-playing-cards` line-art and is permissively MIT-licensed. CREDITS.md license summary collapsed to MIT + OFL-1.1. The default card back is original work in this project's midnight-purple palette. | 2026-05-01 |
+| Runtime SVG card-theme system (`CARD_PLAN.md`) | User-supplied themes need to ship SVG sources so they can rasterise at any resolution on the player's hardware; baking PNGs at build time only would lock theme installation to the developer. The pipeline (usvg → resvg → tiny-skia) rasterises once per (theme, target size) at load time and caches the resulting `Image`, so the runtime cost is paid once, not per frame. The bundled default theme ships via `embedded://`; user themes via `themes://` rooted at `user_theme_dir()`. | 2026-05-01 |

CHANGELOG.md

@@ -0,0 +1,883 @@
+# Changelog
+
+All notable changes to Solitaire Quest are documented here. The format is
+based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/) and this
+project follows [Semantic Versioning](https://semver.org/).
+
+## [Unreleased]
+
+_Nothing yet._
+
+## [0.19.0] — 2026-05-06
+
+Closes the v0.18.0 punch list (items B and D — async hint and
+persistent replay share URLs), expands desktop platform fit
+(Wayland session support + monitor-aware default window size for
+HiDPI / 4K displays), polishes the win-celebration and
+double-click animation paths, and clears two test-flake
+contributors. A short-lived "Rusty Pixel" pixel-art card theme
+was prototyped and reverted in the same window — the engine
+plumbing it touched (`pixel_art` field on `ThemeMeta`, PNG
+manifest face support, second `embedded://` theme channel) was
+fully reverted and is not part of this release.
+
+### Changed
+
+- **H-key hint runs on `AsyncComputeTaskPool`** (`3e11e9e`). The
+  synchronous `try_solve_from_state` call on every H press is gone;
+  `handle_keyboard_hint` now spawns a task whose result the new
+  `pending_hint::poll_pending_hint_task` system surfaces one frame
+  later. New `PendingHintTask` resource carries the in-flight handle
+  plus `move_count_at_spawn` for staleness detection;
+  `drop_pending_hint_on_state_change` cancels the task whenever the
+  game state shifts; `PendingHintTask::spawn` implements
+  cancel-on-replace so two quick H presses keep at most one task in
+  flight. Mirrors the v0.18.0 `PendingNewGameSeed` template.
+  `emit_hint_visuals` and `find_heuristic_hint` are extracted as
+  `pub` helpers so the polling system can call them.
+- **Persistent replay share URLs** (`42d90b1`). v0.18.0's
+  `LastSharedReplayUrl` was an in-memory resource wiped on quit —
+  the player had to share within the session of the win.
+  `solitaire_data::Replay` now carries a `share_url: Option<String>`
+  field with `#[serde(default)]` (no `REPLAY_SCHEMA_VERSION` bump
+  needed; older `replays.json` files load unchanged with `share_url
+  == None` on every entry). `poll_replay_upload_result` writes the
+  resolved URL into `replays[0].share_url` and persists the updated
+  history via `save_replay_history_to`. The Stats overlay's
+  "Copy share link" button reads from
+  `history.0.replays[selected.0].share_url`, so the Prev/Next
+  selector's currently-displayed replay drives the clipboard
+  contents — each historical win keeps its own URL.
+  `LastSharedReplayUrl` removed (its role is now subsumed by the
+  `share_url` field on the replay record).
+
+### Added
+
+- **Wayland session support** (`b57db01`). The workspace
+  `Cargo.toml` Bevy feature list now enables `wayland` alongside
+  `x11`. winit prefers Wayland when `WAYLAND_DISPLAY` is set on the
+  session, falling back to X11 when it isn't. Pre-fix, a Wayland
+  desktop environment fell through to XWayland, rendering the
+  game inside an X11 frame stitched into the Wayland compositor.
+  Post-fix, the game opens as a native Wayland surface. Costs a
+  few hundred KB of binary for the libwayland-client bindings;
+  cross-distro friendly because winit dlopen-probes the libraries
+  rather than hard-linking them.
+- **Monitor-relative default window size** (`b57db01`). On launches
+  with no saved geometry, the new
+  `apply_smart_default_window_size` Update system queries
+  `Monitor` (with the `PrimaryMonitor` marker) and resizes the
+  primary window to ~70 % of the monitor's *logical* size on the
+  first frame. Before, every fresh launch opened at 1280×800
+  regardless of monitor; on a 4K monitor that's a comparatively
+  tiny window in one corner. Logical size already accounts for
+  the OS's HiDPI scale factor, so a Retina display reporting
+  scale_factor 2.0 yields the same physical inches as a 1080p
+  display reporting 1.0. Skipped entirely when saved geometry was
+  applied — the player's chosen size always wins.
+
+### Fixed
+
+- **Duplicate "You Win" toast on game-won** (`55c235b`). The
+  post-win UI was firing two celebration surfaces: a 4-second
+  toast banner ("You Win! Score: X Time: Y") on top of the
+  `win_summary_plugin`'s "You Won!" modal. In screenshots the
+  toast banner was partially clipped behind the modal card,
+  peeking out on either side. The toast predated the modal and is
+  strictly subsumed by it; removed. The cards-fly-off cascade
+  animation (`MotionCurve::Expressive` per-card rotation drift)
+  is unchanged — that's the visual celebration, distinct from
+  the textual celebration the modal owns. `WIN_TOAST_SECS` const
+  removed.
+- **Double-click on a single card with no destination now plays
+  the reject animation** (`d7ffb16`). `handle_double_click` only
+  fired `MoveRejectedEvent` for multi-card stacks with no
+  destination; a double-click on a single card whose top didn't
+  fit any foundation or tableau slot produced zero feedback —
+  no `card_invalid.wav`, no source-pile shake. Both priorities'
+  failure paths now converge on a single rejection at the end of
+  the double-click branch, so single-card and stack misses get
+  the same feedback shape as drag-and-drop rejections.
+- **Double-click move animation no longer plays twice**
+  (`6037596`). On a successful double-click, the slide-to-
+  destination animation rendered twice — once from the move's
+  `StateChangedEvent` landing, then again from the release's
+  `end_drag` firing a redundant `StateChangedEvent` mid-slide.
+  `sync_cards_on_change` saw the card mid-CardAnim (`cur ≠
+  target`) and replaced the in-flight tween with a fresh one
+  starting at the mid-position, visibly restarting the slide. The
+  defensive `StateChangedEvent` write in `end_drag`'s
+  uncommitted-drag branch is removed; `start_drag` only mutates
+  `DragState` (never card transforms), so an uncommitted drag
+  has no visual side effect to undo. The committed-drag branch
+  keeps its `StateChangedEvent` since real drag snap-backs do
+  need a resync.
+- **`auto_save_writes_after_30_seconds` test flake** (`91b7605`).
+  The test's single-frame `app.update()` was sensitive to
+  first-frame `Time::delta_secs()` variance under heavy parallel
+  cargo-test load, and to production-disk
+  `~/.local/share/solitaire_quest/game_state.json` state leaking
+  into the test world via `GamePlugin::build`'s load path.
+  `test_app` now resets `PendingRestoredGame(None)` after plugin
+  build (preventing the dev machine's saved-game state from
+  tripping the auto-save guard) and the test re-arms the timer in
+  a small bounded loop until the file appears (robust against
+  first-frame Time variance). No production-code change.
+
+### Stats
+
+- 1170 passing tests (was 1166 at v0.18.0 close — net +4 from
+  the persistent share URL backwards-compat test, the three
+  async-hint tests, minus the dropped synchronous hint tests).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.18.0] — 2026-05-06
+
+The launch-experience round. The engine used to drop the player on a
+silent default Classic deal whether they had unfinished work or not;
+v0.18.0 replaces that with two stacked decision points — a Restore
+prompt for in-progress saves, then an MSSC-style Home / mode picker
+that surfaces Daily / Zen / Challenge / Time Attack as picture tiles
+with live stats. The same round closes the last solver-on-main-thread
+hot path (winnable-only seed selection moves to
+`AsyncComputeTaskPool`), wires "Copy share link" into Stats, lights a
+"Won before" HUD chip on re-deals of beaten seeds, and tidies the
+unified-3.0 rule set across CLAUDE.md / CLAUDE_SPEC.md /
+CLAUDE_WORKFLOW.md / CLAUDE_PROMPT_PACK.md.
+
+### Added
+
+- **Restore prompt on launch** (`3c7a0eb`). When `game_state.json`
+  holds an in-progress game (`move_count > 0`, not won), the engine
+  now seeds `GameStateResource` with a fresh deal and holds the saved
+  game in a new `PendingRestoredGame` resource. After the splash
+  clears, a "Welcome back" modal offers **Continue** (Enter / C /
+  click) or **New game** (N / click). Fresh-deal saves
+  (`move_count == 0`) skip the prompt and load directly.
+- **Save preservation while the prompt is unanswered** (`f863d85`).
+  Both `save_game_state_on_exit` and `auto_save_game_state` consult
+  `PendingRestoredGame` first: if it still holds a pending saved
+  game, that's what gets persisted (or the auto-save is skipped),
+  so exiting before answering the prompt no longer overwrites the
+  meaningful save with the placeholder fresh deal.
+- **Home / mode picker auto-shows on launch** (`dd63261`). The mode
+  picker was only reachable via **M** during gameplay; players who
+  hadn't discovered the hotkey never saw the Daily / Zen / Challenge
+  / Time Attack entry points after the splash cleared. `HomePlugin`
+  gains an `auto_show_on_launch` flag (default true) and a
+  one-shot `LaunchHomeShown` gate. Skips when the Restore prompt is
+  on screen so Welcome-back still takes precedence.
+- **MSSC-style Home picker — header / chips / score chips / draw
+  mode** (`ae40a1d`). Player-stats header strip (Level / XP /
+  Lifetime Score, compact-formatted as `1.2M` / `12.3K` / `1,234`)
+  acts as a clickable shortcut to Profile. Draw-mode chip row above
+  the mode cards lets the player flip Draw 1 / Draw 3 from the
+  picker itself; persists `settings.json` and respawns the modal so
+  the active state repaints cleanly. Per-mode best-score / streak
+  chips on each card; hidden on a 0 best so a fresh profile doesn't
+  read "Best 0" everywhere.
+- **Today's Event callout on the Daily card** (`b73d246`). "Today,
+  May 6" date line plus the server-fetched goal (when SyncPlugin is
+  wired). Once today's daily is recorded as completed, the date
+  flips to `Today, May 6 • Done` in `ACCENT_PRIMARY` so the picker
+  reads as a reward state rather than a TODO.
+- **Picture-tile mode cards** (`9fe650f` + glyph-picking follow-ups
+  `40d6e0a`, `c30b04e`, `d065d49`). Mode cards become a wrapping
+  2-up grid (`FlexWrap::Wrap`, tiles 48 % wide, `min_height: 180px`)
+  with a centred Unicode-glyph centrepiece per tile. Final glyph set
+  picked from FiraMono-Medium's actual coverage: ♣ Classic, ◆ Daily,
+  ○ Zen, ▲ Challenge, → TimeAttack. `ACCENT_PRIMARY` when the mode is
+  unlocked, `TEXT_DISABLED` when locked. Centrepiece is a `Text` node
+  for now — when real per-mode artwork lands, swap to `Image` without
+  touching tile layout, focus order, or chip rendering.
+- **Solver-vetted seed selection on `AsyncComputeTaskPool`**
+  (`d489e7a`). Closes the worst-case 6 s UI stall on a New Game
+  click with "Winnable deals only" enabled. New `PendingNewGameSeed`
+  resource holds the in-flight `Task<u64>` plus the original
+  request's `mode` / `confirmed` flags. `poll_pending_new_game_seed`
+  runs `.before(GameMutation)` and replays a synthetic
+  `NewGameRequestEvent` once the task resolves — the player sees no
+  extra-frame visual lag. Cancel-on-replace: a fresh
+  `NewGameRequestEvent` while a task is in flight drops the old
+  task, letting Bevy's `Task` Drop cancel cooperatively at the next
+  await point.
+- **"Won before" HUD indicator** (`bdac754`). When the current
+  deal's `(seed, draw_mode, mode)` triple matches an entry in the
+  rolling `ReplayHistory`, the HUD's tier-2 context row shows
+  **✓ Won before** in `STATE_SUCCESS`. Cleared on win (the on-screen
+  victory cue is enough) and on first-time deals. New
+  `HudWonPreviously` marker driven by a separate
+  `update_won_previously` system; gracefully no-ops in headless
+  tests that don't load `StatsPlugin`.
+- **"Copy share link" Stats button** (`540869c`). End-to-end replay
+  sharing on a server-backed sync backend:
+  `sync_plugin::push_replay_on_win` spawns the upload on
+  `AsyncComputeTaskPool` and stores the handle in
+  `PendingReplayUpload` (drops any in-flight predecessor — the most
+  recent win is what the player wants the link for);
+  `poll_replay_upload_result` writes `<server>/replays/<id>` to
+  `LastSharedReplayUrl` on success; the Stats overlay's action bar
+  gains a button that writes the URL to the OS clipboard via
+  `arboard` and surfaces a "Copied: \<url\>" toast. URL is in-memory
+  only — sharing must happen within the session of the win.
+- **Empty-state copy + onboarding hints** (`56e2e6f`). Leaderboard
+  empty state: two-tier "Be the first on the leaderboard." headline
+  + body invite. Achievements panel: first-launch hint above the
+  grid until the first unlock. Volume hotkeys (`[` / `]`) now emit
+  an `InfoToastEvent` with the new percentage so off-panel
+  adjustments give visible feedback (previously silent).
+- **Enter dismisses the Win Summary and starts a fresh deal**
+  (`17e0737`). The post-win modal's "Play Again" was click-only;
+  keyboard-only players had to reach for the mouse to leave the
+  celebration screen. The button label gains a trailing return-key
+  glyph so the keyboard path is discoverable on first sight.
+- **`N` opens the real Confirm/Cancel modal** (`93660c2`). The old
+  "Press N again" double-tap pattern was a UI-first violation (only
+  continuation was another keystroke). `N` now fires
+  `NewGameRequestEvent::default()` directly; `handle_new_game`'s
+  active-game check spawns the existing `ConfirmNewGameScreen`. The
+  HUD button already routed through the same modal — keyboard and
+  mouse paths are unified. `Shift+N` keeps the keyboard power-user
+  bypass (`confirmed: true`).
+
+### Changed
+
+- **Settings row layout** (`a4bc063`). All five
+  slider/toggle row helpers (volume × 2, tooltip delay, time-bonus
+  multiplier, replay-move interval, generic toggle) restructured to
+  a label-spacer-cluster layout (`width: 100%`, label gets
+  `flex-grow: 1`, controls cluster sits flush right). Stable across
+  varying value-text widths ("0.80" → "1.00", "Instant" vs "1.5 s")
+  and narrow windows.
+- **Docs adopt the unified-3.0 rule set** (`f2f30c8`). `CLAUDE.md`
+  grows from a 114-line pointer doc to a 571-line rulebook (hard
+  global constraints §2, engine rules §3, asset rules §4, code
+  standards §5, build + verification §6, git workflow §7, the ASK
+  BEFORE list §8, Context Injection System §14). New companions:
+  `CLAUDE_SPEC.md` (formal architecture spec — crate dependency
+  graph, data ownership, state-machine invariants, sync merge /
+  server contracts, validation checklist),
+  `CLAUDE_WORKFLOW.md` (two-agent Builder/Guardian pipeline with
+  hard-fail patterns), `CLAUDE_PROMPT_PACK.md` (task-type
+  templates). Three duplicate rule passages removed across
+  `CLAUDE_SPEC.md` and `ARCHITECTURE.md`.
+- **Test discipline pruning** (`a49a340`). Removed 43 low-value
+  tests across `solitaire_data` and `solitaire_core` (default-value
+  tests, serde-derive round-trips on plain structs, single-field
+  clamp tests, near-duplicates, constant-equals-itself tests). None
+  pinned a behaviour contract or a regression on a real bug. Future
+  agent briefs request tests for behaviour contracts or real-bug
+  regressions, not a count of N.
+
+### Fixed
+
+- **Esc on a modal no longer opens Pause underneath** (`08b006f`).
+  A single Esc press on Confirm New Game / Restore / Home /
+  Onboarding / Settings used to both close the modal and spawn the
+  Pause overlay on top in the same frame. `toggle_pause` now skips
+  when any non-Pause `ModalScrim` is in the world; the HUD-button
+  path is gated too. The four modal queries are bundled into a
+  `PauseModalQueries` `SystemParam` to stay under Bevy's
+  16-parameter cap.
+- **Esc dismisses Home / accepts the Restore-prompt default**
+  (`d48b948`). Both screens previously ignored Esc, leaving the
+  player no keyboard-only escape after the previous fix. Home: Esc
+  behaves like Cancel (despawns the modal, keeps the underlying
+  default deal). Restore: Esc maps to Continue (preserves the saved
+  game, matching how the primary action already advertises Enter).
+- **Esc dismisses the topmost modal when Profile stacks on Home**
+  (`9aa0dd2`). Clicking the Home header chip opens Profile on top
+  of Home; Esc used to close Home (because
+  `handle_home_cancel_button` fired with no awareness of layered
+  modals) and leave Profile orphaned over the game.
+  `profile_plugin` now splits P/button (toggle) from Esc
+  (close-only); `handle_home_cancel_button` skips its Esc branch
+  when any other `ModalScrim` exists.
+- **Restore-prompt resolution suppresses Home auto-show**
+  (`b7c3a49`). Resolving the Welcome-back prompt cleared
+  `PendingRestoredGame` and despawned the modal, but the
+  launch-time Home auto-show then fired the next frame and stacked
+  itself over the player's chosen path. `LaunchHomeShown` becomes
+  `pub` so `handle_restore_prompt` flips it to `true` after either
+  resolution; **M** still re-opens the picker on demand.
+- **Game timers freeze while the Home picker is up** (`c497c31`).
+  The HUD's elapsed-time counter ticked from the moment the default
+  Classic deal landed at startup, even though the auto-show Home
+  picker was still up — the player saw "0:11" before they had
+  chosen a mode. `tick_elapsed_time` and `advance_time_attack` now
+  also gate on the absence of `HomeScreen`, mirroring their
+  existing `PausedResource` check.
+- **Popover rows stay visible regardless of action-bar fade**
+  (`cc63532`). Opening Modes / Menu showed a solid dark-purple
+  block in the top-right with no readable content — the action-bar
+  auto-fade was matching the popover rows by their shared
+  `ActionButton` marker and dropping their alpha to the
+  cursor-position-based fade value (typically 0). New `PopoverRow`
+  marker on rows in `spawn_modes_popover` / `spawn_menu_popover`;
+  `apply_action_fade` excludes them via `Without<PopoverRow>`.
+
+### Stats
+
+- 1166 passing tests (was 1208 at v0.17.0 close — 43 net removals
+  from the test-discipline prune plus 1 net-new test from the
+  async-seed work, no behaviour regressions).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.17.0] — 2026-05-06
+
+A short follow-up round on top of v0.16.0: the H-key hint is no
+longer a heuristic guess but the actual best first move suggested by
+the v0.15.0 solver, and the in-engine replay player now has a
+player-tunable playback rate.
+
+### Added
+
+- **Replay-rate slider** in Settings → Gameplay. Tunes
+  `replay_move_interval_secs` from 0.10 s to 1.00 s in 0.05 s steps;
+  default 0.45 s. `tick_replay_playback` reads the value from
+  `SettingsResource` per frame so the slider takes effect on the
+  next playback tick — no restart required.
+
+### Changed
+
+- **Solver-driven hints.** Pressing **H** used to surface a
+  heuristic-best move (foundation moves preferred, then
+  tableau-to-tableau by depth-of-flip-revealed). It now asks the
+  v0.15.0 solver for the actual provably-best first move via the
+  new `solitaire_core::solver::try_solve_with_first_move` /
+  `try_solve_from_state` APIs. When the solver returns inconclusive
+  (rare deals where the bound runs out before a result), the old
+  heuristic remains the fallback. Median 2 ms per H press.
+
+### Stats
+
+- 1208 passing tests (was 1196 at v0.16.0 close).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.16.0] — 2026-05-06
+
+A modal-feel polish round. Every overlay screen now scrolls when its
+content overflows the 800×600 minimum window, every clickable button
+shows a hand cursor on hover, keyboard focus lands on the primary
+button on the same frame the modal opens, and read-only modals
+dismiss when the player clicks the scrim outside the card.
+
+### Added
+
+- **Pointer cursor on hover** for every interactive `Button` entity
+  (modal buttons, HUD action bar, mode-launcher cards, settings
+  toggles, Stats selectors). `update_cursor_icon` gains a fourth
+  branch sitting between Grabbing (active drag) and Grab
+  (draggable card hover): when no drag is active and any
+  `Interaction::Hovered`/`Pressed` button is detected, the window
+  cursor swaps to `SystemCursorIcon::Pointer`. A pure
+  `pick_cursor_icon` helper makes the priority logic
+  unit-testable.
+- **Click-outside-to-dismiss** for the six read-only modals: Stats,
+  Achievements, Help, Profile, Leaderboard, Home. New
+  `ScrimDismissible` marker on `ModalScrim` opts a modal in;
+  `dismiss_modal_on_scrim_click` runs in `Update`, despawns the
+  topmost dismissible scrim on a left-mouse press whose cursor
+  lands on the scrim and outside every `ModalCard`. Bevy's
+  hierarchy despawn cascades to the card and children.
+  Settings, Onboarding, Pause, Forfeit confirm, and Confirm New
+  Game intentionally don't opt in — they carry unsaved or
+  destructive state.
+
+### Fixed
+
+- **Modal content scrolls when it overflows** (Achievements, Help,
+  Stats, Profile, Leaderboard). Each modal's body Node now
+  carries `Overflow::scroll_y()` plus a `max_height` constraint
+  (`Val::Vh(70.0)` for most, `Val::Vh(50.0)` for the
+  leaderboard's variable-length ranking section) and a marker
+  component (`AchievementsScrollable`, `HelpScrollable`,
+  `StatsScrollable`, `ProfileScrollable`,
+  `LeaderboardScrollable`). A sibling `scroll_*_panel` system
+  per modal routes `MouseWheel` events into the body's
+  `ScrollPosition`. Mirrors the existing `SettingsPanelScrollable`
+  pattern. Home modal intentionally not scrolled — its five
+  mode cards + Cancel are sized to fit at 800×600 by design.
+- **Modal focus arrives on the same frame the modal opens.**
+  Previously `attach_focusable_to_modal_buttons` and
+  `auto_focus_on_modal_open` ran in `Update` alongside arbitrary
+  click-handlers that spawn modals; with no ordering edge,
+  Bevy's deferred `Commands` queued the new entities but the
+  attach system couldn't see them on the same tick. Both systems
+  moved to `PostUpdate` so the schedule boundary itself supplies
+  the sync point — `FocusedButton` is always populated before
+  `app.update()` returns. The very next Tab/Enter press lands on
+  a populated resource instead of wasting itself moving focus
+  from None to the primary.
+
+### Stats
+
+- 1196 passing tests (was 1178 at v0.15.0 close).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.15.0] — 2026-05-02
+
+In-engine replay playback, the Klondike solver + "Winnable deals
+only" toggle, a 19th achievement, rolling replay history, and a
+significant build-time / binary-size win from disabling Bevy's
+default audio stack.
+
+### Added
+
+- **In-engine replay playback** for the Stats overlay's Watch Replay
+  button. New `ReplayPlaybackPlugin` runs a state machine
+  (Inactive / Playing / Completed) that resets the live game to the
+  recorded deal and ticks through `replay.moves` at
+  `REPLAY_MOVE_INTERVAL_SECS` (0.45 s) firing the canonical
+  `MoveRequestEvent` / `DrawRequestEvent` per recorded move.
+  Recording is suppressed during playback so replays don't re-record
+  themselves.
+- **Replay overlay banner** (`ReplayOverlayPlugin`) anchored to the
+  top of the window during playback. Shows "Replay" label, "Move N
+  of M" progress, and a Stop button. Z-order leaves modals
+  (Settings, Pause, Help) free to render on top so the player can
+  adjust audio mid-replay.
+- **Rolling replay history** at `<data_dir>/replays.json` capped at
+  8 entries. Replaces the single-slot `latest_replay.json` (legacy
+  file is migrated forward on first launch via
+  `migrate_legacy_latest_replay`). Stats overlay gains a Prev / Next
+  selector and a "Replay N / M" caption so the player can revisit
+  older wins.
+- **"Cinephile" achievement** (#19). Unlocks the first time
+  `ReplayPlaybackState` transitions Playing → Completed (i.e. the
+  replay played out to its end without the player pressing Stop).
+  Stop transitions Playing → Inactive directly so it doesn't count.
+- **Klondike solver** in `solitaire_core::solver`. Iterative-DFS
+  with memoisation on a 64-bit canonical state hash, two budget
+  knobs (move_budget + state_budget) for pathological cases, and a
+  three-state `SolverResult` (Winnable / Unwinnable / Inconclusive).
+  Median solve time 2 ms; pathological inconclusives cap near
+  120 ms. Pure logic — `solitaire_core` keeps no Bevy or I/O.
+- **"Winnable deals only" toggle** in Settings → Gameplay (default
+  off). When on, `handle_new_game` walks seed N, N+1, N+2, …
+  through `try_solve` until it finds Winnable or Inconclusive,
+  capped at `SOLVER_DEAL_RETRY_CAP` (50) attempts. Daily
+  challenges, replays, and explicit-seed requests bypass the
+  solver — only random Classic deals are gated.
+
+### Changed
+
+- **Bevy default-feature trim** (`bevy = { default-features = false,
+  features = [...] }` in workspace Cargo.toml) drops 51 transitive
+  crates including the `bevy_audio` → rodio → cpal 0.15 + symphonia
+  chain that the project doesn't use (kira handles audio directly).
+  The retained feature list is curated to exactly what the engine
+  uses; `solitaire_wasm` is unaffected because it doesn't depend on
+  bevy.
+
+### Stats
+
+- 1178 passing tests (was 1134 at v0.14.0 close).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.14.0] — 2026-05-02
+
+Two threads land in v0.14.0: the second half of the post-v0.12.0 UX
+candidate list (theme thumbnails, daily-challenge calendar, Time Attack
+auto-save, per-mode bests, time-bonus multiplier) plus a **major new
+feature** — the replay pipeline (record → upload → web viewer). Three
+Quat-reported bugs from a smoke-test round shipped alongside.
+
+### Added
+
+- **Theme-picker thumbnails** in Settings → Cosmetic. Each theme chip
+  renders a small Ace-of-Spades + back preview pair via the existing
+  `rasterize_svg` path. Cached per theme in a new
+  `ThemeThumbnailCache`. Themes that lack a preview SVG fall back to
+  a transparent placeholder rather than crashing.
+- **14-day daily-challenge calendar** in the Profile modal. Horizontal
+  row of dots showing the trailing two weeks; today's dot is ringed
+  in `ACCENT_PRIMARY`, completed days fill `STATE_SUCCESS`, missed
+  days fill `BG_ELEVATED`. Caption above the row reads "Current
+  streak: N · Longest: M".
+- **Time Attack session auto-save** to `<data_dir>/time_attack_session.json`,
+  atomic .tmp + rename. 30-second auto-save while a session is active,
+  plus on `AppExit`. Sessions whose 10-minute window expired in real
+  time while the app was closed are discarded on load. Classic, Zen,
+  and Challenge already auto-saved correctly via `game_state.json` —
+  Time Attack was the only mode missing session-level persistence.
+- **Per-mode best-score and fastest-win readouts** in the Stats screen.
+  `StatsSnapshot` gains six `#[serde(default)]` fields (Classic / Zen
+  / Challenge × best_score + fastest_win_seconds). Stats screen renders
+  a "Per-mode bests" section between the primary cell grid and
+  progression. Lifetime totals continue to roll all modes together.
+- **Time-bonus multiplier slider** in Settings → Gameplay (0.0–2.0,
+  0.1 steps, default 1.0, "Off" label at zero). Cosmetic only —
+  multiplies the time-bonus shown in the win modal but does NOT
+  affect achievement unlock thresholds (those still use the raw
+  unmultiplied score).
+- **Win-replay recording + storage.** Every move during a successful
+  game appends to a `RecordingReplay` resource; on `GameWonEvent`
+  the recording freezes into a `Replay` (seed + draw_mode + mode +
+  score + time + ordered move list) and persists to
+  `<data_dir>/latest_replay.json` atomically. Single-slot — overwrites
+  on every win.
+- **"Watch replay" button** in the Stats overlay. Shows the latest
+  win's caption and surfaces a button that loads the replay (button
+  fires an `InfoToastEvent` describing the replay; full in-engine
+  playback is deferred to a future build).
+- **Replay upload + fetch endpoints** on the server. `POST /api/replays`
+  accepts a `Replay` JSON; `GET /api/replays/:id` returns it. JWT-gated
+  with the existing auth middleware. Engine uploads winning replays
+  automatically when the player has cloud sync configured.
+- **`solitaire_wasm` crate** — new workspace member compiling
+  replay-relevant `solitaire_core` types to WebAssembly so a
+  browser can re-execute a replay client-side. No-std-friendly
+  surface; `wasm-bindgen` glue.
+- **Web replay viewer** served from the Solitaire server.
+  `GET /replays/:id` returns HTML + CSS + the wasm bundle that
+  fetches the replay JSON, rasterises a deal from the seed, and
+  animates the recorded moves.
+- **Card flight animations on the web side** so the browser viewer
+  reads as a real game replay rather than a static dump.
+
+### Fixed
+
+- **Multi-card lift validation.** `solitaire_core::rules::is_valid_tableau_sequence`
+  rejects a moved stack whose adjacent cards don't form a descending
+  alternating-colour run. Previously a player could lift any
+  multi-card selection and drop it as long as the bottom landed
+  legally. Wired into `move_cards`'s tableau-destination branch.
+- **Softlock detection.** `has_legal_moves` rewritten to walk every
+  potential move source (every stock card, every waste card, the
+  face-up top of every tableau column) and check it against every
+  foundation and every tableau. Previously the heuristic
+  early-returned `true` whenever stock had cards — players got
+  stuck in unwinnable end-states with no end-game screen.
+  `GameOverScreen` now actually fires for true softlocks. Quat's
+  exact reproduction case is pinned by a new test.
+- **Deal-tween information leak.** New-game now snaps every card
+  sprite to the stock pile position before writing
+  `StateChangedEvent`, so all 52 cards animate from a single point
+  during the deal. Previously the sprites started from their
+  previous-game positions, briefly revealing the prior deal.
+
+### Documentation
+
+- `SESSION_HANDOFF.md` refreshed for the Quat smoke-test round
+  including investigation findings on solver decisions and
+  dependency duplicates.
+
+### Stats
+
+- 1134 passing tests (was 1053 at v0.13.0 close).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.13.0] — 2026-05-02
+
+Third UX iteration round on top of v0.12.0. Six handoff candidates
+shipped — three small polish items, three larger interaction
+features (theme-aware backs, full keyboard play, right-click power
+shortcut). Plus two code-review fixes (font handling unified,
+sccache wiring removed).
+
+### Added
+
+- **Tooltip-delay slider** in Settings → Gameplay. `tooltip_delay_secs`
+  ranges [0.0, 1.5] in 0.1 s steps; "Instant" label when zero.
+  `Settings.tooltip_delay_secs` round-trips through serialise/deserialise
+  with `#[serde(default)]`. The hover-delay comparison in
+  `ui_tooltip` reads from `SettingsResource` with the existing
+  `MOTION_TOOLTIP_DELAY_SECS` as the test-fixture fallback.
+- **Win-streak fire animation.** New `WinStreakMilestoneEvent` fires
+  from `stats_plugin` when `win_streak_current` crosses any of
+  [3, 5, 10] (only the threshold crossing — not every subsequent
+  win). The HUD streak readout scale-pulses 1.0 → 1.20 → 1.0 over
+  `MOTION_STREAK_FLOURISH_SECS` (0.6 s).
+- **Score-breakdown reveal on the win modal.** Replaces the single
+  "Score: N" line with a per-component reveal (Base / Time bonus /
+  No-undo bonus / Mode multiplier / Total). Rows fade in over
+  `MOTION_SCORE_BREAKDOWN_FADE_SECS` (0.12 s) staggered by
+  `MOTION_SCORE_BREAKDOWN_STAGGER_SECS` (0.15 s). Honours
+  `AnimSpeed::Instant` by spawning all rows fully visible.
+- **Card backs follow the active theme.** `theme.ron`'s `back` slot
+  now actually drives the face-down sprite. Active-theme back
+  rasterises alongside the faces and supersedes the legacy
+  `back_N.png` picker. The picker remains as a fallback for themes
+  that don't ship a back, and the Settings UI surfaces a caption
+  ("Active theme provides its own back") + dimmed swatches when
+  the override is in effect.
+- **Keyboard-only drag-and-drop.** Tab cycles draggable card stacks,
+  Enter "lifts" the focused stack, arrow keys (or Tab) cycle the
+  legal-destination targets only, Enter confirms, Esc cancels. A
+  new `KeyboardDragState` resource models the two-mode flow without
+  changing the existing `SelectionState` contract. Mutual exclusion
+  with mouse drag uses a sentinel `DragState.active_touch_id =
+  KEYBOARD_DRAG_TOUCH_ID` (u64::MAX) so neither pipeline can
+  trample the other.
+- **Right-click radial menu.** Hold right-click on a face-up card →
+  a small ring of icons appears at the cursor with one entry per
+  legal destination. Release over an icon → fires
+  `MoveRequestEvent`; release in dead space, Esc, or left-click
+  cancels. Skips the drag motion entirely. New `RadialMenuPlugin`
+  owns the flow; co-exists with the existing `RightClickHighlight`
+  pile-marker tint.
+
+### Fixed
+
+- **Font handling consolidated to bundled-only.** Code-review
+  feedback: the SVG rasteriser previously mixed
+  `load_system_fonts` + bundled FiraMono + a lenient resolver,
+  which made card text rendering depend on host fontconfig. Picked
+  option (a) and applied it across both layers — `font_plugin` now
+  embeds `assets/fonts/main.ttf` via `include_bytes!()` and
+  registers it with `Assets<Font>`; `svg_loader::shared_fontdb`
+  loads only the bundled bytes; the new `bundled_font_resolver`
+  ignores the SVG's `font-family` request and always returns the
+  single bundled face. A parse failure aborts with a clear error
+  ("bundled FiraMono failed to parse — binary is corrupt").
+
+### Removed
+
+- **Project-level sccache wiring.** Code-review feedback: sccache
+  shouldn't be a per-project build dependency. Cargo's incremental
+  cache already covers the single-project case, and forcing
+  `rustc-wrapper = "sccache"` workspace-wide meant every contributor
+  had to install it. `.cargo/config.toml` deleted entirely; plain
+  `cargo build` now works without setup.
+
+### Documentation
+
+- `help_plugin` controls reference gains a "Mouse" section covering
+  double-click auto-move, right-click highlight, and the new
+  hold-RMB radial.
+- `help_plugin` also gains a "Keyboard drag" section for the new
+  Tab/Enter/Arrows/Esc flow.
+- Onboarding slide 3 picks up a `Tab → Enter` row referencing the
+  full keyboard drag path.
+
+### Stats
+
+- 1053 passing tests (was 1031 at v0.12.0 close).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.12.0] — 2026-05-02
+
+UX feel polish round on top of v0.11.0. Six small-but-tangible
+improvements that make the play surface feel more responsive,
+forgiving, and discoverable, plus the doc refresh that should have
+ridden along with v0.11.0.
+
+### Added
+
+- **Foundation completion flourish.** When a King lands on a
+  foundation (Ace-through-King for that suit), a brief celebration
+  fires: King card scale-pulses 1.0 → 1.15 → 1.0 over 0.4 s, the
+  foundation marker tints `STATE_SUCCESS` for the first half then
+  fades, and a synthesised C6→E6→G6 bell ping plays (~240 ms,
+  octave above `win_fanfare`'s root so the fourth completion + win
+  cascade layer cleanly). New `FoundationCompletedEvent { slot,
+  suit }` carries the trigger so future systems can hook in.
+- **Drag-cancel return tween.** Illegal drops glide each dragged
+  card back to its origin slot over 150 ms with a quintic ease-out
+  curve (`MotionCurve::Responsive`, zero overshoot — reads forgiving
+  rather than jittery). The audio cue (`card_invalid.wav`) still
+  fires for negative feedback. Right-click and double-click invalid
+  paths still use `ShakeAnim` since there's no motion to interpolate.
+- **Focus ring breathing.** The keyboard focus ring's alpha modulates
+  with a 1.4 s sin curve over [0.65, 1.0] of its native value so the
+  indicator catches the eye on focus changes without competing with
+  gameplay. Honours `AnimSpeed::Instant` by reverting to the static
+  outline for reduced-motion users.
+- **First-win achievement onboarding toast.** After the player's
+  very first win, a one-shot info toast surfaces "First win! Press
+  A to see your achievements." `Settings.shown_achievement_onboarding`
+  persists the seen state so the cue never re-fires (legacy
+  `settings.json` files load to `false` via `#[serde(default)]`).
+- **Mode Launcher digit shortcuts.** Pressing M opens the Home modal
+  (the Mode Launcher); inside it, pressing 1–5 launches each mode
+  directly without needing Tab + Enter. Locked modes (Zen, Challenge,
+  Time Attack at level < 5) are silent no-ops. Modal-scoped — digit
+  keys outside the launcher fire nothing.
+
+### Fixed
+
+- **Card aspect ratio matches hayeah SVGs.** `CARD_ASPECT` 1.4 →
+  1.4523 to match the bundled artwork's natural 167.087 × 242.667
+  dimensions. Cards previously rendered ~3.6 % vertically squashed.
+  The vertical-budget math in `compute_layout` uses `CARD_ASPECT`
+  algebraically so the worst-case-tableau-fits-on-screen guarantee
+  adapts automatically.
+
+### Documentation
+
+- **README refresh** with v0.11.0+ features (card themes, HUD
+  overhaul, drag feel, unlocked foundations) and a corrected controls
+  table — the previous table inverted Z/U for undo and listed H for
+  help when F1 is the binding.
+- **CHANGELOG.md** added (this file), covering v0.9.0–v0.12.0 with
+  Keep a Changelog 1.1.0 conventions.
+
+### Stats
+
+- 1007 passing tests (was 982 at v0.11.0).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.11.0] — 2026-05-02
+
+The biggest release since 0.10.0. Headline threads: a runtime card-theme
+system, an HUD restructure that reclaims the play surface, and a round of
+UX feel polish surfaced by smoke testing.
+
+### Added
+
+- **Runtime card-theme system** (CARD_PLAN phases 1–7).
+  - Bundled default theme ships in the binary via `embedded://` — 52
+    [hayeah/playing-cards-assets](https://github.com/hayeah/playing-cards-assets)
+    SVGs (MIT) plus a midnight-purple `back.svg` as original work.
+  - User themes live under `themes://` rooted at `user_theme_dir()`. Drop
+    a directory containing `theme.ron` + 53 SVGs and the registry picks
+    it up on next launch.
+  - Importer at `solitaire_engine::theme::import_theme(zip)` validates
+    archives (20 MB cap, zip-slip rejection, manifest validation, every
+    SVG round-tripped through the rasteriser) and atomically unpacks.
+  - Picker UI in **Settings → Cosmetic**; selection persists as
+    `selected_theme_id` and propagates to live sprites.
+- **Reserved HUD top band** (64 px) so cards no longer crowd the score
+  readout or action buttons; layout's `top_y` shifts down accordingly.
+- **Action-bar auto-fade** — buttons fade out when the cursor leaves the
+  band, fade back in when it returns. Lerp at ~167 ms.
+- **Visible drop-target overlay during drag** — a soft fill plus 3 px
+  outline drawn ABOVE stacked cards for every legal target (full fanned
+  column for tableaux, card-sized for foundations and empty tableaux).
+  Replaces the previously invisible pile-marker tint.
+- **Card drop shadows** — every card casts a neutral 25 % black shadow
+  with a 4 px halo; cards in the active drag set switch to a lifted
+  shadow (40 % alpha, larger offset, bigger halo).
+- **Stock remaining-count badge** — small `·N` chip at the top-right of
+  the stock pile so the player can see how close they are to a recycle.
+  Hides when the stock empties.
+
+### Changed
+
+- **Foundations are unlocked.** `PileType::Foundation(Suit)` →
+  `Foundation(u8)` (slot 0..3). The claimed suit is derived from the
+  bottom card via `Pile::claimed_suit()` — no separate field, no
+  claim-stuck-after-undo bugs. Any Ace lands in any empty slot, and the
+  slot then claims that suit. `next_auto_complete_move` prefers a
+  claim-matched slot before falling back to the first empty slot for
+  Aces. Empty foundation markers render as plain placeholders (no
+  "C/D/H/S").
+- **HUD selection label** and **hint toast** read `claimed_suit()` and
+  fall through to "Foundation N" / "move to foundation" only when the
+  slot is empty.
+
+### Fixed
+
+- **`shared_fontdb` now bundles FiraMono.** The hayeah SVGs reference
+  `Bitstream Vera Sans` and `Arial` by name. On minimal Linux installs
+  / fresh Wayland sessions / chroots where neither is installed AND the
+  CSS-generic aliases don't resolve, card rank/suit text vanished. The
+  bundled font is loaded into fontdb and pinned as every CSS generic's
+  target so the resolver always lands on something real. Surfaced when
+  a second-machine pull rendered cards without glyphs.
+- **Theme asset path resolution** — `AssetPath::resolve` (concatenates)
+  → `resolve_embed` (RFC 1808 sibling resolution). Was producing paths
+  like `…/theme.ron/hearts_4.svg` and failing to load every face SVG.
+- **Sync exit log spam** — `push_on_exit` silently no-ops on
+  `LocalOnlyProvider`'s `UnsupportedPlatform` instead of warn-spamming
+  every shutdown.
+- **usvg font-substitution warn spam** — custom `FontResolver.select_font`
+  appends `Family::SansSerif` and `Family::Serif` to every query so
+  unmatched named families silently fall through.
+
+### Migration
+
+- **In-progress saves invalidated.** `GameState.schema_version` bumped
+  1 → 2; pre-v2 `game_state.json` files silently fall through to "fresh
+  game on launch." Stats, progress, achievements, and settings live in
+  separate files and are unaffected.
+
+### Stats
+
+- 982 passing tests (was 819 at v0.10.0).
+- Zero clippy warnings under `--workspace --all-targets -- -D warnings`.
+
+## [0.10.0] — 2026-04-29
+
+PNG art pipeline plus a major dependency pass. The first release where
+the binary shipped with bundled artwork.
+
+### Added
+
+- **52 individual card face PNGs** generated via `solitaire_assetgen`.
+- **Custom font** (FiraMono-Medium) loaded via `AssetServer` at startup
+  through the new `FontPlugin`.
+- **Card backs and backgrounds** upgraded to 120×168 with richer
+  patterns.
+- **Ambient audio loop** wired through the kira mixer.
+- **Arch Linux PKGBUILDs** for the game client and sync server (under
+  the separate `solitaire-quest-pkgbuild` directory).
+- **Workspace README, CI workflow, migration guide.**
+
+### Changed
+
+- **Bevy 0.15 → 0.18** workspace migration.
+- **kira 0.9 → 0.12** audio backend migration.
+- **Edition 2024**, MSRV pinned to **Rust 1.95**.
+- **rand 0.9** upgrade.
+- **Card rendering** moved from `Text2d` overlay to PNG-backed
+  `Sprite` with face/back atlases; `Text2d` retained as a headless
+  fallback when `CardImageSet` is absent (tests under MinimalPlugins).
+- **Asset pipeline** switched from `include_bytes!()` for PNGs/TTFs to
+  runtime `AssetServer::load()` so artwork can be swapped without a
+  recompile. Audio remains embedded.
+- **Removed Google Play Games Services sync backend** — redundant with
+  the self-hosted server.
+
+### Fixed
+
+- **Server JWT secret** loaded at startup (was lazy, surfaced as
+  intermittent 500s).
+- **Daily-challenge race** in the server's seed-generation path.
+- **Rate limiter** switched to `SmartIpKeyExtractor` so the limit
+  applies per real client IP rather than per upstream proxy.
+- **Touch input** uses `MessageReader<TouchInput>` (Bevy 0.18 rename).
+- **Sync push/pull races** in async task scheduling.
+- **Hot-path allocations** reduced in card-rendering systems.
+- **Conflict report coverage** added for sync merge edge cases.
+
+### Stats
+
+- 819 passing tests at tag time.
+
+## [0.9.0] — 2026-04-28
+
+Initial public-tagged release. Established the workspace structure
+(`solitaire_core` / `_sync` / `_data` / `_engine` / `_server` / `_app` /
+`_assetgen`), the modal scaffold via `ui_modal`, the design-token system
+in `ui_theme`, and the four-tier HUD layout. Foundations were
+suit-locked at this point; cards rendered as `Text2d` rank/suit overlays
+with no PNG artwork yet.
+
+### Added
+
+- Klondike core (Draw One / Draw Three modes).
+- Progression system (XP, levels, 18 achievements, daily challenge,
+  weekly goals, special modes at level 5).
+- Self-hosted sync server (Axum + SQLite + JWT auth).
+- All 12 overlay screens migrated to the `ui_modal` scaffold with real
+  Primary/Secondary/Tertiary buttons.
+- Animation upgrades: `SmoothSnap` slide curves, scoped settle bounce,
+  deal jitter, win-cascade rotation.
+- Splash screen, focus rings (Phases 1–3), tooltips infrastructure +
+  HUD/Settings/popover applications, achievement integration tests,
+  destructive-confirm verb unification, leaderboard error/idle states,
+  first-launch empty-state polish, hit-target accessibility fix,
+  CREDITS.md, persistent window geometry, mode-launcher Home repurpose,
+  client-side sync round-trip integration tests.
+
+[Unreleased]: https://github.com/funman300/Rusty_Solitaire/compare/v0.16.0...HEAD
+[0.16.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.15.0...v0.16.0
+[0.15.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.14.0...v0.15.0
+[0.14.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.13.0...v0.14.0
+[0.13.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.12.0...v0.13.0
+[0.12.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.11.0...v0.12.0
+[0.11.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.10.0...v0.11.0
+[0.10.0]: https://github.com/funman300/Rusty_Solitaire/compare/v0.9.0...v0.10.0
+[0.9.0]: https://github.com/funman300/Rusty_Solitaire/releases/tag/v0.9.0

CLAUDE.md

@@ -1,114 +1,571 @@
-# Solitaire Quest — Claude Code Instructions
+# CLAUDE.md
 
-See @ARCHITECTURE.md for full project design, crate responsibilities, data models, and API reference.
+version: unified-3.0
 
 ---
 
-## Project Layout
+# 0. Role of This File
 
-```text
-solitaire_core/    # Pure Rust game logic — NO Bevy, NO network, NO I/O
-solitaire_sync/    # Shared API types — NO Bevy, serde/uuid/chrono only
-solitaire_data/    # Persistence + SyncProvider trait + server client
-solitaire_engine/  # Bevy ECS systems, components, plugins
-solitaire_server/  # Axum sync server binary
-solitaire_app/     # Thin binary entry point
-assets/            # Source assets — embedded at compile time via include_bytes!()
+This document defines:
+
+* **Execution rules (what Claude must do)**
+* **System constraints (what Claude must never violate)**
+* **Operational architecture (how code is structured)**
+
+For full system design details:
+→ `ARCHITECTURE.md` (authoritative source of truth)
+
+This file overrides all conversational assumptions.
+
+---
+
+# 1. System Architecture (Authoritative Mapping)
+
+## 1.1 Crates
+
+```text id="crate_map"
+solitaire_core/    # PURE logic (no IO, no Bevy, deterministic)
+solitaire_sync/    # Shared API + merge logic
+solitaire_data/    # Persistence + sync client
+solitaire_engine/  # Bevy ECS + UI + gameplay orchestration
+solitaire_server/  # Axum backend (optional sync layer)
+solitaire_app/     # Entry binary
+assets/            # Runtime assets (except audio)
 ```
 
 ---
 
-## Build & Test Commands
+## 1.2 Architecture Source of Truth
 
-```bash
-# Dev run (fast compile via dynamic linking)
-cargo run -p solitaire_app --features bevy/dynamic_linking
+* Full system design: `ARCHITECTURE.md`
+* This file NEVER redefines system design
+* This file ONLY enforces behavior
 
-# Release build
-cargo build --workspace --release
+---
 
-# All tests — MUST pass before any commit
+# 2. Hard Global Constraints (NON-NEGOTIABLE)
+
+These override all other instructions.
+
+## 2.1 Core Determinism
+
+* `solitaire_core` MUST:
+
+  * be deterministic
+  * be side-effect free
+  * never depend on Bevy / IO / async
+
+---
+
+## 2.2 Sync Isolation
+
+* `solitaire_sync`:
+
+  * no Bevy
+  * no IO
+  * no engine dependencies
+* merge logic must be pure functions only
+
+---
+
+## 2.3 Error Policy
+
+* NO `unwrap()`
+* NO `panic!()` in runtime/game logic
+* All state transitions:
+
+```rust id="err_model"
+Result<T, MoveError>
+```
+
+---
+
+## 2.4 Threading Rules
+
+* Sync must run on `AsyncComputeTaskPool`
+* NEVER block Bevy main thread
+
+---
+
+## 2.5 Persistence Rules
+
+* atomic writes only:
+
+  * write `.tmp`
+  * rename atomically
+* no partial state writes allowed
+
+---
+
+## 2.6 Security Rules
+
+* credentials ONLY via `keyring`
+* NEVER store secrets in:
+
+  * files
+  * logs
+  * source code
+
+---
+
+## 2.7 Sync System Rules
+
+* All sync backends implement:
+
+```rust id="sync_trait"
+trait SyncProvider
+```
+
+* `SyncPlugin` MUST be backend-agnostic
+* NEVER match on backend inside ECS systems
+
+---
+
+# 3. Engine Rules (Bevy Layer)
+
+## 3.1 ECS Design
+
+* systems = single responsibility
+* communication = Events only
+* shared state = Resources only
+* per-entity state = Components only
+
+---
+
+## 3.2 Game State Authority
+
+* ONLY `GameStateResource` can mutate game state
+* UI systems MUST NOT directly modify core logic
+
+---
+
+## 3.3 UI-First Constraint (CRITICAL)
+
+Every player action MUST:
+
+* have a visible UI control
+* NOT rely solely on keyboard shortcuts
+
+Keyboard shortcuts are:
+→ optional accelerators only
+
+---
+
+## 3.4 Layout System
+
+* recompute on `WindowResized`
+* no fixed resolution assumptions
+
+---
+
+# 4. Asset System Rules
+
+## 4.1 Runtime Assets (AssetServer)
+
+Loaded via:
+
+* `CardImageSet`
+* `BackgroundImageSet`
+* `FontResource`
+
+Includes:
+
+* cards
+* backgrounds
+* fonts
+
+---
+
+## 4.2 Embedded Assets
+
+Only audio:
+
+```text id="audio_rule"
+include_bytes!()
+```
+
+---
+
+## 4.3 Test Compatibility Rule
+
+All asset loaders MUST accept:
+
+```rust id="asset_fallback"
+Option<Res<AssetServer>>
+```
+
+Must degrade gracefully under `MinimalPlugins`.
+
+---
+
+# 5. Code Standards
+
+## 5.1 Error Handling
+
+* use `thiserror`
+* no `Box<dyn Error>` in libraries
+
+---
+
+## 5.2 Public API Rules
+
+* prefer `Into<T>` over concrete types
+* all public items require doc comments
+
+---
+
+## 5.3 Derive Order
+
+```rust id="derive_order"
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+```
+
+---
+
+## 5.4 Performance Rules
+
+* NO `clone()` in hot paths
+* profile before optimizing
+
+---
+
+## 5.5 SQL Rules
+
+* ONLY `sqlx::query!`
+* NO raw SQL strings
+
+---
+
+# 6. Build & Verification Rules
+
+These are mandatory before ANY commit.
+
+```bash id="build_rules"
 cargo test --workspace
-
-# Lint — MUST pass clean (zero warnings)
 cargo clippy --workspace -- -D warnings
-
-# Run sync server locally
-cargo run -p solitaire_server
-
-# Check a single crate
-cargo test -p solitaire_core
-cargo clippy -p solitaire_core -- -D warnings
 ```
 
 ---
 
-## Hard Rules
+# 7. Git Workflow Rules
 
-- `solitaire_core` and `solitaire_sync` must never gain Bevy or network dependencies.
-- No `unwrap()` or `panic!()` in game logic. All state transitions return `Result<_, MoveError>`.
-- Audio assets are embedded at compile time using `include_bytes!()` in `audio_plugin.rs`.
-- Card faces (52 PNGs in `assets/cards/faces/`), card backs (`assets/cards/backs/back_N.png`), board backgrounds (`assets/backgrounds/bg_N.png`), and the UI font (`assets/fonts/main.ttf`) are loaded at runtime via `AssetServer::load()` and stored as `Handle<Image>`/`Handle<Font>` in the `CardImageSet`, `BackgroundImageSet`, and `FontResource` resources. The `assets/` directory must ship alongside the binary.
-- Asset-loading systems take `Option<Res<AssetServer>>` so they degrade cleanly under `MinimalPlugins` (tests). When `CardImageSet` is absent, `card_plugin` falls back to a `Text2d` rank+suit overlay; when `BackgroundImageSet` is absent, the board falls back to a solid colour.
-- Atomic file writes only: write to `filename.json.tmp`, then `rename()`.
-- Passwords and tokens are stored in the OS keychain via the `keyring` crate — never in plaintext files or logs.
-- Sync runs on `AsyncComputeTaskPool` — never block the Bevy main thread.
-- All sync backends implement the `SyncProvider` trait. The `SyncPlugin` is backend-agnostic — never `match` on `SyncBackend` inside a Bevy system.
-- `cargo clippy --workspace -- -D warnings` must pass clean after every change.
-- `cargo test --workspace` must pass after every change.
+## Commit format
+
+```text id="commit_fmt"
+type(scope): description
+```
+
+Examples:
+
+* feat(core): add draw-three rules
+* fix(engine): correct drag z-order
+* test(core): undo boundary cases
 
 ---
 
-## Code Style
+## Commit conditions
 
-- Use `thiserror` for error types. Never `Box<dyn Error>` in library crates.
-- Prefer `Into<T>` over concrete types in public API function parameters.
-- All public items must have doc comments (`///`). Private items: comment only when non-obvious.
-- Derive order convention: `#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]`
-- Bevy systems: one responsibility per system. Use `Events` for cross-system communication, never shared mutable state.
-- SQL queries: use `sqlx::query!` macros (compile-time checked), not raw string queries.
-- No `clone()` calls in hot paths (game loop systems). Profile before optimising elsewhere.
+* tests must pass
+* clippy must be clean
+
+NEVER commit otherwise
 
 ---
 
-## Bevy Conventions
+# 8. Change Control (ASK BEFORE DOING)
 
-- One `Plugin` per major feature: `CardPlugin`, `AudioPlugin`, `AchievementPlugin`, `UIPlugin`, `SyncPlugin`.
-- Resources own shared state. Events communicate between systems. Components own per-entity data.
-- All UI screens are built with Bevy UI (`bevy::ui`). Never mix UI layout and game logic in the same system.
-- Layout is recomputed on `WindowResized` — never assume a fixed window size.
-- **UI-first.** Every player-triggered action (new game, undo, draw, pause, open stats / settings / help / profile / leaderboard, switch mode, etc.) must be reachable from a visible UI control. Keyboard shortcuts are optional accelerators — never the sole entry point. New gameplay features ship with the UI control alongside the system that backs it; do not merge a feature that is keyboard-only.
+Claude must request confirmation before:
+
+* adding dependencies
+* modifying `solitaire_sync`
+* changing DB schema
+* introducing `unsafe`
+* changing merge strategy
 
 ---
 
-## Git Workflow
+# 9. System Mental Model (IMPORTANT)
 
-- Commit after each passing phase, not after every file change.
-- Commit message format: `type(scope): description`
-  - `feat(core): add draw-three mode validation`
-  - `fix(engine): card z-order during drag`
-  - `test(core): undo stack boundary conditions`
-  - `chore(server): add sqlx migration 002`
-- Never commit with failing tests or clippy warnings.
-- Never commit secrets, `.env` files, or `*.db` files.
+```text id="mental_model"
+Core (rules + deterministic logic)
+    ↓
+Engine (Bevy orchestration)
+    ↓
+Data layer (persistence + sync)
+    ↓
+Server (optional external system)
+```
+
+Core is always the source of truth.
 
 ---
 
-## Ask Before Doing
+# 10. Known Platform Pitfalls
 
-- Adding a new crate dependency (discuss alternatives first).
-- Changing a type in `solitaire_sync` (breaking change on both client and server).
-- Altering the database schema (requires a new sqlx migration).
-- Introducing `unsafe` code anywhere.
-- Changing the merge strategy in `solitaire_sync::merge()`.
+Must always be handled explicitly:
+
+* Bevy `Time` uses `f32`
+* `sqlx::migrate!()` path is crate-relative
+* `dirs::data_dir()` may return `None`
+* Linux may lack keyring backend
 
 ---
 
-## Lessons Learned
+# 11. Forbidden Patterns
 
-> Add entries here when Claude makes a mistake so it isn't repeated.
+* game logic inside Bevy systems
+* duplication across crates
+* blocking async calls in ECS
+* insecure credential storage
+* bypassing core logic layer
 
-- Bevy's `Time` resource uses `f32` seconds; convert to `u64` only when writing to `StatsSnapshot`.
-- `sqlx::migrate!()` macro path is relative to the crate root, not the workspace root.
-- `keyring` on Linux requires a running secret service (e.g. GNOME Keyring or KWallet) — handle `Error::NoStorageAccess` gracefully and fall back to prompting the user.
-- `dirs::data_dir()` returns `None` on some minimal Linux environments — always handle the `None` case explicitly, do not unwrap.
+---
+
+# 12. Execution Rules for Claude
+
+When generating code:
+
+1. respect crate boundaries
+2. minimize diff size
+3. do not expand scope
+4. follow existing patterns
+5. preserve invariants
+
+If unclear:
+→ ask before acting
+
+---
+
+# 13. Relationship to ARCHITECTURE.md
+
+| File            | Role                      |
+| --------------- | ------------------------- |
+| CLAUDE.md       | execution + constraints   |
+| ARCHITECTURE.md | system design truth       |
+| Both combined   | full system understanding |
+
+---
+# 14. Context Injection System (AUTOMATIC SCOPE FILTER)
+
+## 14.1 Purpose
+
+Before generating any response, Claude MUST construct a **minimal relevant context set**.
+
+This prevents:
+
+* architectural drift
+* irrelevant spec loading
+* over-engineering
+* cross-crate confusion
+
+---
+
+## 14.2 Input Classification Step (MANDATORY)
+
+Every request MUST be classified into exactly one task type:
+
+```text id="task_types"
+feature
+bugfix
+refactor
+system_design
+bevy_system
+core_logic
+sync
+optimization
+test
+debug
+```
+
+If uncertain → ask clarification.
+
+---
+
+## 14.3 Context Selection Engine
+
+After classification, Claude MUST include ONLY the relevant sections below.
+
+---
+
+## 14.4 Context Map (CORE RULESET)
+
+### feature
+
+Include:
+
+* §2 Hard Global Constraints
+* §3 Engine Rules
+* ARCHITECTURE.md (crate of target feature only)
+* relevant data models (GameState, SyncPayload if needed)
+
+---
+
+### bugfix
+
+Include:
+
+* §2 Hard Global Constraints
+* §5 Code Standards
+* affected crate boundaries
+* relevant system (engine/core/sync only)
+
+---
+
+### refactor
+
+Include:
+
+* §3 Engine Rules
+* §5 Code Standards
+* §11 Forbidden Patterns
+* target crate boundaries
+
+---
+
+### system_design
+
+Include:
+
+* ARCHITECTURE.md (FULL)
+* §9 Mental Model
+* §1 System Architecture Mapping
+
+---
+
+### core_logic
+
+Include:
+
+* solitaire_core rules only
+* GameState model
+* MoveError model
+* §2.1–2.3 constraints
+
+---
+
+### bevy_system
+
+Include:
+
+* §3 Engine Rules
+* ECS rules (Events/Resources/Components)
+* UI-first constraint
+* relevant plugin system only
+
+---
+
+### sync
+
+Include:
+
+* SyncProvider trait
+* merge strategy rules
+* solitaire_sync models
+* §2.6 Sync Rules
+
+---
+
+### optimization
+
+Include:
+
+* target crate only
+* §5.4 Performance Rules
+* hot path constraints
+
+---
+
+### test
+
+Include:
+
+* §6 Build Rules
+* relevant module
+* expected invariants
+
+---
+
+### debug
+
+Include:
+
+* target file/module only
+* §2.3 Error Policy
+* runtime assumptions relevant to failure
+
+---
+
+## 14.5 Context Compression Rules
+
+Claude MUST obey:
+
+* never include full ARCHITECTURE.md unless system_design
+* max 2 crates per response unless explicitly required
+* prefer function-level context over file-level context
+* exclude unrelated plugins/systems
+
+---
+
+## 14.6 Context Priority Order
+
+When space is limited:
+
+1. Hard Constraints (§2)
+2. Target crate rules
+3. Data models
+4. Only then: architecture snippets
+
+---
+
+## 14.7 “No Context Pollution” Rule
+
+Claude must NOT include:
+
+* unrelated crates
+* unrelated plugins
+* unused data models
+* full architecture dumps
+* speculative systems
+
+---
+
+## 14.8 Self-Check Before Execution
+
+Before writing code, Claude MUST verify:
+
+* [ ] Is only relevant context included?
+* [ ] Is at least one hard constraint present?
+* [ ] Am I touching more than one crate unnecessarily?
+* [ ] Am I duplicating ARCHITECTURE.md content?
+
+If any fail → revise context selection.
+
+---
+
+## 14.9 Injection Output Format (Internal Model)
+
+Claude should behave as if it constructed:
+
+```text id="ctx_format"
+[SELECTED TASK TYPE]
+
+[MINIMAL REQUIRED RULES]
+
+[MINIMAL ARCHITECTURE SLICES]
+
+[RELEVANT MODELS]
+
+[REQUEST]
+```
+
+---
+
+## 14.10 Relationship to ARCHITECTURE.md
+
+* ARCHITECTURE.md = source of truth
+* CLAUDE.md = execution constraints
+* THIS SECTION = filtering layer between them
+
+---
+
+# END CONTEXT INJECTION SYSTEM

CLAUDE_PROMPT_PACK.md

@@ -0,0 +1,497 @@
+# CLAUDE_PROMPT_PACK.md
+
+version: 1.0
+
+---
+
+# 0. GLOBAL INSTRUCTION (prepend to every prompt)
+
+```
+You must follow CLAUDE_SPEC.md strictly.
+
+Rules:
+- Do not expand scope beyond what is defined
+- Do not refactor unrelated code
+- Do not introduce new dependencies
+- Prefer minimal, surgical changes
+- Use existing patterns in the codebase
+- Return minimal diffs or changed functions only
+
+Before writing code:
+1. List relevant constraints from CLAUDE_SPEC.md
+2. Identify risks
+3. Then implement
+```
+
+---
+
+# 1. FEATURE IMPLEMENTATION
+
+```
+# TASK: Feature Implementation
+
+feature: "<name>"
+
+goal:
+"<clear outcome>"
+
+scope:
+crates: []
+systems: []
+files: []
+
+non_goals:
+- ""
+
+constraints:
+- must follow CLAUDE_SPEC.md
+- event-driven architecture required
+- no blocking operations
+- no cross-crate leakage
+
+acceptance_criteria:
+- ""
+- ""
+
+edge_cases:
+- ""
+
+---
+
+## Required Patterns
+
+Use this pattern for systems:
+<PASTE EXISTING SYSTEM SNIPPET HERE>
+
+---
+
+## Output Format
+
+intent:
+plan:
+constraints_used:
+risks:
+
+code_changes:
+(minimal diffs only)
+
+notes:
+```
+
+---
+
+# 2. BUGFIX
+
+```
+# TASK: Bug Fix
+
+bug_description:
+"<what is broken>"
+
+expected_behavior:
+"<correct behavior>"
+
+root_cause_hint (optional):
+""
+
+scope:
+crates: []
+files: []
+
+constraints:
+- minimal fix only
+- no refactors unless required
+- must add regression protection if applicable
+
+---
+
+## Requirements
+
+1. Identify root cause
+2. Fix it minimally
+3. Preserve all invariants
+4. Do not change unrelated logic
+
+---
+
+## Output Format
+
+analysis:
+root_cause:
+fix_strategy:
+
+code_changes:
+(minimal diff)
+
+regression_test (only if high-value):
+
+notes:
+```
+
+---
+
+# 3. REFACTOR
+
+```
+# TASK: Refactor
+
+target:
+"<what is being improved>"
+
+goal:
+"<what improves>"
+
+scope:
+crates: []
+files: []
+
+non_goals:
+- no behavior changes
+- no new features
+
+constraints:
+- must preserve behavior exactly
+- must respect crate boundaries
+- must not duplicate logic
+
+---
+
+## Refactor Type
+
+- [ ] simplify logic
+- [ ] reduce duplication
+- [ ] improve readability
+- [ ] performance (non-invasive)
+
+---
+
+## Output Format
+
+analysis:
+issues_found:
+
+refactor_plan:
+
+code_changes:
+(diff only)
+
+verification:
+- behavior unchanged: yes/no
+- invariants preserved: yes/no
+
+notes:
+```
+
+---
+
+# 4. SYSTEM DESIGN (NEW FEATURE)
+
+```
+# TASK: System Design
+
+feature:
+"<name>"
+
+goal:
+"<what problem it solves>"
+
+constraints:
+- must fit existing architecture
+- must follow plugin + event model
+- must not violate crate boundaries
+
+---
+
+## Required Output
+
+design:
+
+components:
+- plugins:
+- systems:
+- events:
+- resources:
+
+data_flow:
+(step-by-step)
+
+integration_points:
+- where it connects to existing systems
+
+risks:
+- ""
+
+tradeoffs:
+- ""
+
+---
+
+## DO NOT
+
+- write full implementation
+- modify unrelated systems
+```
+
+---
+
+# 5. NEW BEVY SYSTEM
+
+```
+# TASK: Add Bevy System
+
+system_name:
+""
+
+trigger:
+(event or condition)
+
+reads:
+[Resources]
+
+writes:
+[Resources]
+
+emits:
+[Events]
+
+constraints:
+- must be event-driven
+- must not directly mutate unrelated state
+- must be single responsibility
+
+---
+
+## Output Format
+
+system_signature:
+
+implementation:
+(code only)
+
+notes:
+```
+
+---
+
+# 6. CORE LOGIC FUNCTION (solitaire_core)
+
+```
+# TASK: Core Logic Implementation
+
+function:
+"<name>"
+
+goal:
+"<what it does>"
+
+rules:
+- no IO
+- no async
+- no Bevy
+- deterministic
+
+invariants:
+- ""
+- ""
+
+errors:
+- ""
+
+---
+
+## Output Format
+
+constraints_checked:
+
+implementation:
+(code only)
+
+edge_case_handling:
+
+notes:
+```
+
+---
+
+# 7. SYNC / MERGE LOGIC
+
+```
+# TASK: Sync Logic
+
+goal:
+"<what is being merged or synced>"
+
+constraints:
+- must be deterministic
+- must be idempotent
+- must be lossless
+- must not delete data
+
+rules:
+- counters → max
+- times → min
+- collections → union
+
+---
+
+## Output Format
+
+analysis:
+
+merge_logic:
+
+code_changes:
+
+invariants_verified:
+- deterministic
+- idempotent
+- lossless
+
+notes:
+```
+
+---
+
+# 8. PERFORMANCE OPTIMIZATION
+
+```
+# TASK: Optimization
+
+target:
+"<what is slow>"
+
+constraints:CLAUDE_WORKFLOW.md
+- no behavior change
+- no architecture change
+- minimal code changes
+
+---
+
+## Output Format
+
+analysis:
+bottleneck:
+
+optimization_strategy:
+
+code_changes:
+
+impact_estimate:
+
+notes:
+```
+
+---
+
+# 9. TEST GENERATION (STRICT MODE)
+
+```
+# TASK: Test Generation
+
+target:
+"<function/system>"
+
+reason:
+- bugfix | complex logic | invariant protection
+
+constraints:
+- no redundant tests
+- must test real behavior
+- must fail if logic breaks
+
+---
+
+## Output Format
+
+test_cases:
+- ""
+
+test_code:
+
+notes:
+```
+
+---
+
+# 10. DEBUGGING / INVESTIGATION
+
+```
+# TASK: Debug
+
+problem:
+"<symptom>"
+
+context:
+"<relevant code or system>"
+
+---
+
+## Required Steps
+
+1. List possible causes
+2. Narrow down most likely
+3. Suggest verification steps
+4. Provide minimal fix
+
+---
+
+## Output Format
+
+hypotheses:
+
+most_likely:
+
+verification_steps:
+
+fix:
+
+notes:
+```
+
+---
+
+# 11. HARD CONSTRAINT OVERRIDE (RARE)
+
+```
+# TASK: Exception Handling
+
+reason:
+"<why constraints must be bent>"
+
+requested_exception:
+"<rule being broken>"
+
+justification:
+"<why unavoidable>"
+
+---
+
+## Output Format
+
+analysis:
+
+alternatives_considered:
+
+final_decision:
+
+risk:
+```
+
+---
+
+# 12. STOP CONDITIONS (always append)
+
+```
+Stop when:
+- acceptance criteria are met
+- code is minimal and correct
+
+Do NOT:
+- expand scope
+- refactor unrelated code
+- optimize prematurely
+```
+
+---
+
+# END

CLAUDE_SPEC.md

@@ -0,0 +1,292 @@
+# CLAUDE_SPEC.md
+
+version: 1.0
+
+---
+
+## 0. Global Rules
+
+(Core determinism, panic policy, and event-driven engine constraints live in CLAUDE.md §2.1, §2.3, §3.1. Listed here only when they add information CLAUDE.md doesn't carry.)
+
+rules:
+
+* id: single_source_of_truth
+  description: "GameStateResource is the only mutable game state in runtime"
+
+* id: sync_is_additive
+  description: "Remote data must never destructively overwrite local data"
+
+---
+
+## 1. Crate Graph
+
+crates:
+solitaire_core:
+depends_on: [rand, serde, chrono]
+forbidden_deps: [bevy, reqwest, tokio, std::fs]
+
+solitaire_sync:
+depends_on: [serde, serde_json, uuid, chrono]
+role: "shared_types"
+
+solitaire_data:
+depends_on: [solitaire_core, solitaire_sync, reqwest, tokio, keyring]
+role: "persistence_and_sync"
+
+solitaire_engine:
+depends_on: [bevy, kira, solitaire_core, solitaire_data]
+role: "runtime_engine"
+
+solitaire_server:
+depends_on: [solitaire_sync, axum, sqlx, jsonwebtoken]
+role: "backend"
+
+solitaire_app:
+depends_on: [solitaire_engine]
+role: "entrypoint"
+
+---
+
+## 2. Data Ownership
+
+ownership:
+GameState:
+owner: solitaire_core
+mutable_in: solitaire_engine
+access_pattern: "via GameStateResource only"
+
+StatsSnapshot:
+owner: solitaire_data
+
+PlayerProgress:
+owner: solitaire_data
+
+AchievementRecord:
+owner: solitaire_data
+
+SyncPayload:
+owner: solitaire_sync
+
+---
+
+## 3. State Transitions
+
+state_machine:
+GameState:
+transitions:
+- action: move_cards
+returns: Result<GameState, MoveError>
+
+```
+  - action: draw
+    returns: Result<GameState, MoveError>
+
+  - action: undo
+    returns: Result<GameState, MoveError>
+
+invariants:
+  - "52 cards always exist"
+  - "no duplicate card IDs"
+  - "all cards belong to exactly one pile"
+```
+
+---
+
+## 4. Event System
+
+events:
+
+input:
+- MoveRequestEvent
+- DrawRequestEvent
+- UndoRequestEvent
+- NewGameRequestEvent
+
+state:
+- StateChangedEvent
+- GameWonEvent
+
+meta:
+- AchievementUnlockedEvent
+- SyncCompleteEvent
+
+rules:
+
+* "Input events trigger core logic"
+* "Core logic emits state events"
+* "UI reacts to state events only"
+
+---
+
+## 5. Sync Contract
+
+sync:
+
+provider_trait:
+methods:
+- pull() -> SyncPayload
+- push(payload) -> SyncResponse
+
+guarantees:
+- "non-blocking during gameplay"
+- "blocking allowed on exit only"
+
+merge:
+rules:
+counters: "max"
+best_times: "min"
+collections: "union"
+achievements: "never removed"
+
+```
+properties:
+  - deterministic
+  - idempotent
+  - lossless
+```
+
+---
+
+## 6. Persistence
+
+storage:
+
+format: json
+
+files:
+- stats.json
+- progress.json
+- achievements.json
+- settings.json
+- game_state.json
+
+guarantees:
+- atomic_write: true
+- crash_safe: true
+
+---
+
+## 7. Engine Rules
+
+engine:
+
+mutation_rules:
+- "Only GameLogicSystem mutates GameState"
+- "UI systems are read-only"
+
+threading:
+- "sync runs on AsyncComputeTaskPool"
+- "main thread must never block"
+
+plugins:
+pattern: "feature_isolation"
+communication: "events"
+
+---
+
+## 8. Server Contract
+
+server:
+
+auth:
+method: jwt
+access_expiry: 24h
+refresh_expiry: 30d
+
+endpoints:
+- POST /api/auth/register
+- POST /api/auth/login
+- GET /api/sync/pull
+- POST /api/sync/push
+
+limits:
+payload_max: 1MB
+rate_limit: "10 req/min auth routes"
+
+---
+
+## 9. Achievement System
+
+achievements:
+
+definition_location: solitaire_core
+state_location: solitaire_data
+
+types:
+- condition_based
+- event_driven
+
+rule:
+- "achievements cannot be revoked"
+
+---
+
+## 10. Testing Rules
+
+testing:
+
+philosophy:
+- "test real failures"
+- "avoid redundant tests"
+
+required_coverage:
+solitaire_core:
+- move_validation
+- undo_integrity
+- win_detection
+
+```
+solitaire_sync:
+  - merge_correctness
+  - idempotency
+```
+
+---
+
+## 11. Prohibited Patterns
+
+(See CLAUDE.md §11 for the canonical forbidden-patterns list.)
+
+---
+
+## 12. Extension Points
+
+extensibility:
+
+sync_backends:
+pattern: "implement SyncProvider"
+
+game_modes:
+location: solitaire_core::GameMode
+
+plugins:
+rule: "new feature = new plugin"
+
+---
+
+## 13. Validation Checklist (for Claude)
+
+validation:
+
+* check: "crate dependency rules respected"
+* check: "no panics in core"
+* check: "events used for cross-system communication"
+* check: "GameState mutations centralized"
+* check: "merge function properties preserved"
+* check: "no blocking operations in main loop"
+
+---
+
+## 14. Mental Model
+
+model:
+
+layers:
+- core
+- engine
+- data
+- server
+
+flow:
+- input -> engine -> core -> engine -> ui
+- data <-> sync <-> server

CLAUDE_WORKFLOW.md

@@ -0,0 +1,335 @@
+# CLAUDE_WORKFLOW.md
+
+version: 1.0
+
+---
+
+## 0. Overview
+
+This workflow defines a **two-agent system**:
+
+* **Builder Agent** → writes and modifies code
+* **Guardian Agent** → enforces architecture + rejects invalid changes
+
+No code is considered valid unless it passes Guardian validation.
+
+---
+
+## 1. Agent Roles
+
+### 1.1 Builder Agent
+
+role: "code_generation"
+
+responsibilities:
+
+* implement features
+* refactor code
+* generate tests (only when justified)
+* follow CLAUDE_SPEC.md
+
+constraints:
+
+* cannot bypass validation
+* must declare intent before writing code
+
+output_contract:
+must_produce:
+- change_summary
+- files_modified
+- reasoning (short)
+- code_diff
+
+---
+
+### 1.2 Guardian Agent
+
+role: "architecture_enforcement"
+
+responsibilities:
+
+* validate against CLAUDE_SPEC.md
+* detect violations
+* reject or approve changes
+* suggest minimal fixes (not full rewrites)
+
+constraints:
+
+* no feature implementation
+* no large rewrites
+* must be deterministic
+
+output_contract:
+must_produce:
+- status: APPROVED | REJECTED
+- violations[]
+- required_fixes[]
+- optional_improvements[]
+
+---
+
+## 2. Workflow Pipeline
+
+```text
+User Request
+    ↓
+Builder Agent (proposal + code)
+    ↓
+Guardian Agent (validation)
+    ↓
+IF approved → commit
+IF rejected → feedback → Builder retry
+```
+
+---
+
+## 3. Builder Protocol
+
+### Step 1 — Intent Declaration
+
+Builder MUST start with:
+
+```yaml
+intent:
+  feature: "<name>"
+  crates_touched: []
+  systems_affected: []
+  risk_level: low|medium|high
+```
+
+---
+
+### Step 2 — Plan
+
+```yaml
+plan:
+  - step: "..."
+  - step: "..."
+```
+
+---
+
+### Step 3 — Implementation
+
+* Only modify declared crates
+* Follow ownership rules
+* Use events for cross-system communication
+
+---
+
+### Step 4 — Output
+
+```yaml
+change_summary: "..."
+
+files_modified:
+  - path: ...
+    change: "..."
+
+violations_self_check:
+  - none | list
+
+notes: "short reasoning"
+```
+
+---
+
+## 4. Guardian Protocol
+
+### Step 1 — Spec Validation
+
+Check against:
+
+* crate boundaries
+* mutation rules
+* event system usage
+* sync guarantees
+* forbidden patterns
+
+---
+
+### Step 2 — Invariant Validation
+
+Must verify:
+
+* GameState invariants preserved
+* no new panic paths
+* no blocking calls in engine
+* merge properties unchanged
+
+---
+
+### Step 3 — Output Decision
+
+#### APPROVED
+
+```yaml
+status: APPROVED
+
+notes:
+  - "no violations"
+```
+
+---
+
+#### REJECTED
+
+```yaml
+status: REJECTED
+
+violations:
+  - id: core_purity_violation
+    file: "solitaire_core/src/..."
+    reason: "uses std::fs"
+
+required_fixes:
+  - "move IO to solitaire_data"
+
+optional_improvements:
+  - "simplify event naming"
+```
+
+---
+
+## 5. Enforcement Rules
+
+### Hard Fail (automatic rejection)
+
+* core crate uses IO / Bevy / network
+* GameState mutated outside GameLogicSystem
+* blocking async on main thread
+* duplicate logic across crates
+* merge function altered incorrectly
+
+---
+
+### Soft Fail (allowed but flagged)
+
+* unnecessary complexity
+* redundant tests
+* minor architectural drift
+
+---
+
+## 6. Iteration Loop
+
+Max attempts per task: **3**
+
+```text
+Attempt 1 → Reject → Fix
+Attempt 2 → Reject → Fix
+Attempt 3 → Final decision
+```
+
+If still failing:
+→ escalate to user
+
+---
+
+## 7. Diff Strategy
+
+Builder MUST produce:
+
+* minimal diffs
+* no unrelated refactors
+* no formatting-only changes
+
+---
+
+## 8. Test Strategy Integration
+
+Builder rules:
+
+* only add tests if:
+
+  * fixing a bug
+  * protecting complex logic
+  * validating invariants
+
+Guardian rejects:
+
+* redundant tests
+* no-op tests
+
+---
+
+## 9. Optional Extensions
+
+### 9.1 Third Agent (Optimizer)
+
+role: performance + cleanup
+
+runs AFTER approval:
+
+* reduce allocations
+* simplify logic
+* improve ECS scheduling
+
+---
+
+### 9.2 CI Integration
+
+Pipeline:
+
+```text
+Builder → Guardian → cargo check → clippy → tests
+```
+
+Guardian runs BEFORE compilation to catch structural issues early.
+
+---
+
+## 10. Example Interaction
+
+### Builder
+
+```yaml
+intent:
+  feature: "undo stack limit fix"
+  crates_touched: [solitaire_core]
+  risk_level: low
+```
+
+```yaml
+change_summary: "limit undo stack to 64 entries"
+
+files_modified:
+  - solitaire_core/src/game_state.rs
+
+notes: "prevents unbounded memory growth"
+```
+
+---
+
+### Guardian
+
+```yaml
+status: APPROVED
+
+notes:
+  - "respects core constraints"
+  - "no invariant violations"
+```
+
+---
+
+## 11. Mental Model
+
+* Builder = **creative**
+* Guardian = **strict**
+
+Builder explores
+Guardian enforces
+
+Neither replaces the other.
+
+---
+
+## 12. Success Criteria
+
+System is working if:
+
+* architectural violations go to ~0
+* code stays consistent across features
+* refactors become safe
+* complexity grows sub-linearly

CREDITS.md

@@ -42,14 +42,20 @@ copyleft code is statically linked into the game binary.
 
 | File(s) | Source | License |
 |---|---|---|
-| `assets/cards/faces/{RANK}{SUIT}.png` (52 PNGs) | xCards @2x artwork | LGPL-3.0 |
-| `assets/cards/backs/back_0.png` (bicycle_blue) | xCards @2x artwork | LGPL-3.0 |
-| `assets/cards/backs/back_1.png` – `back_4.png` | Original — generated by `solitaire_assetgen::gen_art` | MIT (this project) |
+| `solitaire_engine/assets/themes/default/{suit}_{rank}.svg` (52 SVGs) | [hayeah/playing-cards-assets](https://github.com/hayeah/playing-cards-assets) | MIT |
+| `solitaire_engine/assets/themes/default/back.svg` | Original — Solitaire Quest | MIT (this project) |
+| `assets/cards/faces/{RANK}{SUIT}.png` (52 PNGs) | Pre-rendered from the same `playing-cards-assets` SVGs | MIT (passed through from hayeah) |
+| `assets/cards/backs/back_0.png` – `back_4.png` | Original — generated by `solitaire_assetgen::gen_art` | MIT (this project) |
 
-xCards is the playing-card artwork bundle by Huub de Beer, published under the
-LGPL-3.0. The art is consumed as unmodified PNG files at runtime; the game
-binary statically links no LGPL code, so distribution as a self-contained
-binary plus the `assets/` directory satisfies the LGPL's relinking clause.
+The face SVGs come from Howard Yeh's `playing-cards-assets` repository, which
+is itself derived from the public-domain `vector-playing-cards` Google Code
+project. The art is redistributed under the MIT license — see the upstream
+repository for the full notice. The files ship unmodified in the bundled
+default theme; user-supplied themes can override them per-installation
+through the runtime SVG theming system documented in `CARD_PLAN.md`.
+
+The default card back is original work by this project, midnight-purple
+themed to match the rest of the UI palette.
 
 ### Backgrounds
 
@@ -92,13 +98,15 @@ Audio files are MIT-licensed alongside the rest of this project.
 ## License Summary
 
 - **Project code:** MIT — see [LICENSE](LICENSE).
-- **xCards card artwork (52 faces + `back_0.png`):** LGPL-3.0, redistributed
-  unmodified. The LGPL applies only to those PNG files; it does not extend to
-  the game binary, which links no LGPL code.
+- **Card face artwork (52 SVGs from hayeah/playing-cards-assets, plus the
+  pre-rendered PNGs in `assets/cards/faces/`):** MIT, redistributed
+  unmodified. The original `vector-playing-cards` line art is itself
+  public domain.
 - **FiraMono-Medium font:** SIL Open Font License 1.1, redistributed unmodified.
-- **All other assets** (backgrounds, generated card backs, every audio file)
-  are original work covered by this project's MIT license.
+- **All other assets** (backgrounds, the default `back.svg`, generated card
+  backs, every audio file) are original work covered by this project's MIT
+  license.
 
 If you redistribute Solitaire Quest, you must ship this `CREDITS.md` and the
-`LICENSE` file alongside the binary so the LGPL and OFL notices remain
-visible to end users.
+`LICENSE` file alongside the binary so the MIT (project + hayeah card art)
+and OFL (FiraMono) notices remain visible to end users.

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "solitaire_server",
     "solitaire_app",
     "solitaire_assetgen",
+    "solitaire_wasm",
 ]
 resolver = "2"
 
@@ -29,15 +30,84 @@ dirs        = "6"
 keyring     = "4"
 keyring-core = "1"
 reqwest     = { version = "0.13", features = ["json", "rustls", "rustls-native-certs"], default-features = false }
+arboard     = { version = "3", default-features = false }
 
 solitaire_core   = { path = "solitaire_core" }
 solitaire_sync   = { path = "solitaire_sync" }
 solitaire_data   = { path = "solitaire_data" }
 solitaire_engine = { path = "solitaire_engine" }
 
-bevy = "0.18"
+# Bevy with `default-features = false` to avoid the unused
+# `bevy_audio → rodio + symphonia + cpal 0.15 + alsa 0.9` chain.
+# Audio is handled directly by `kira` in `audio_plugin.rs`, so the
+# `bevy_audio` feature is intentionally omitted. The features below
+# enumerate every leaf of the standard `2d` + `ui` meta-features that
+# we actually use; new features should only be added with a
+# corresponding use site.
+bevy = { version = "0.18", default-features = false, features = [
+    # default_app
+    "async_executor",
+    "bevy_asset",
+    "bevy_input_focus",
+    "bevy_log",
+    "bevy_state",
+    "bevy_window",
+    "custom_cursor",
+    "reflect_auto_register",
+    # default_platform (desktop subset; no android/webgl/gilrs/sysinfo)
+    "std",
+    "bevy_winit",
+    "default_font",
+    "multi_threaded",
+    # winit prefers Wayland when WAYLAND_DISPLAY is set on the
+    # session and falls through to X11 otherwise. Without `wayland`,
+    # winit-on-Wayland-session falls back to XWayland which renders
+    # the game in an X11 frame inside the Wayland compositor.
+    "wayland",
+    "x11",
+    # common_api
+    "bevy_color",
+    "bevy_image",
+    "bevy_mesh",
+    "bevy_shader",
+    "bevy_text",
+    "png",
+    # 2d rendering
+    "bevy_camera",
+    "bevy_render",
+    "bevy_core_pipeline",
+    "bevy_sprite",
+    "bevy_sprite_render",
+    # UI rendering
+    "bevy_ui",
+    "bevy_ui_render",
+] }
 kira = "0.12"
 
+# SVG rasterisation pipeline for the runtime card-theme system.
+# usvg parses + simplifies; resvg renders to a tiny-skia Pixmap;
+# tiny-skia provides the CPU rasteriser. All three are maintained
+# together by the resvg-rs project and version in lockstep.
+usvg      = "0.47"
+resvg     = "0.47"
+tiny-skia = "0.12"
+
+# Theme manifest format. RON keeps the file human-editable while
+# preserving Rust-style structures the importer can validate.
+ron = "0.12"
+
+# Importer-only: reads user-supplied theme zip archives, validates
+# their contents, and unpacks them into the user themes directory.
+# Default features are disabled to keep the dependency footprint small;
+# only `deflate` is needed because the importer rejects other
+# compression methods anyway (see Phase 7 spec).
+zip = { version = "8.6", default-features = false, features = ["deflate"] }
+
+# Importer-only test dependency: tests build zip archives in a
+# scratch directory so they don't pollute the real user themes path
+# on the developer's machine.
+tempfile = "3.27"
+
 axum               = "0.8"
 sqlx               = { version = "0.8", features = ["runtime-tokio-rustls", "sqlite", "macros", "migrate"] }
 jsonwebtoken       = { version = "10", default-features = false, features = ["rust_crypto"] }

README.md

@@ -1,17 +1,35 @@
 # Solitaire Quest
 
-A cross-platform Klondike Solitaire game written in Rust, featuring a full progression system with XP, levels, achievements, daily challenges, and optional self-hosted sync so your stats follow you across machines.
+A cross-platform Klondike Solitaire game written in Rust, with a card-theme
+system, full progression (XP / levels / achievements / daily challenges), and
+optional self-hosted sync so your stats follow you across machines.
 
 ## Features
 
-- **Klondike Solitaire** — Draw One and Draw Three modes
+- **Klondike Solitaire** — Draw One and Draw Three modes; foundations are
+  unlocked (any Ace lands in any empty slot, the slot then claims that suit)
+- **Card themes** — bundled hayeah/playing-cards-assets default plus
+  user-installable themes (drop a directory under the data dir or import a
+  zip from Settings → Cosmetic)
+- **Modern HUD** — reserved top band keeps cards from crowding the score
+  readout; the action bar auto-fades when the cursor leaves it so it can't
+  compete with the play surface
+- **Drag feel** — every legal drop target is highlighted in green during
+  drag; cards cast a soft drop shadow that lifts when picked up; the stock
+  pile shows a remaining-count chip so you can see how close you are to a
+  recycle
+- **Keyboard navigation** — Tab cycles focus through buttons, arrow keys
+  move within picker rows, Enter activates; works across every modal and
+  the HUD action bar
 - **Progression** — XP, levels, unlockable card backs and backgrounds
-- **18 Achievements** — including secret ones
-- **Daily Challenge** — server-seeded so every player worldwide gets the same deal
+- **19 Achievements** — including secret ones
+- **Daily Challenge** — server-seeded so every player worldwide gets the
+  same deal
 - **Leaderboard** — opt-in, powered by your own self-hosted server
 - **Special Modes** (unlocked at level 5): Zen, Time Attack, Challenge
 - **Sync** — pull/push stats across devices via a self-hosted server
-- **Color-blind mode** — blue tint on red-suit cards
+- **Color-blind mode** — blue tint on red-suit cards alongside the suit
+  glyph
 
 ## Building
 
@@ -32,49 +50,72 @@ cargo build -p solitaire_app --release
 
 ## Controls
 
+Every action also has a visible UI button — keyboard shortcuts are optional
+accelerators.
+
 | Key | Action |
 |---|---|
 | Left click / drag | Move cards |
+| Double click | Auto-move card to its best legal destination |
 | Right click | Highlight legal moves for a card |
 | Space / D | Draw from stock |
-| Z / Ctrl+Z | Undo |
+| U | Undo |
+| H | Hint (highlight a legal move) |
 | N | New game |
-| S | Stats overlay |
-| A | Achievements overlay |
-| P | Profile overlay |
-| O | Settings |
-| L | Leaderboard |
-| H | Help / controls |
-| Enter | Auto-complete (when badge is lit) |
-| Escape | Pause / clear selection |
-| Arrow keys | Navigate card selection |
+| Z | Zen mode |
+| G | Forfeit (during pause) |
+| Tab / Shift+Tab | Cycle keyboard focus |
+| Enter | Activate focused button / auto-complete (when badge is lit) |
+| Esc | Pause / dismiss modal |
+| F1 | Help / controls |
+| F11 | Toggle fullscreen |
+| S / A / P / O / L / M | Stats / Achievements / Profile / Settings / Leaderboard / Menu |
+
+## Card themes
+
+The default theme ships embedded in the binary, so the game runs
+self-contained with no external assets. To install another theme, drop a
+directory containing a `theme.ron` manifest plus 53 SVG files (52 faces +
+1 back) under the platform data dir's `themes/` folder, or import a zip
+from **Settings → Cosmetic**. The picker chip lights up the moment a new
+theme is registered. Themes are SVG-based, so they rasterise cleanly at
+whatever resolution the window happens to be.
 
 ## Sync Server (optional)
 
-To sync stats across machines, run the self-hosted server. See [README_SERVER.md](README_SERVER.md) for setup instructions.
+To sync stats across machines, run the self-hosted server. See
+[README_SERVER.md](README_SERVER.md) for setup instructions.
 
-Once the server is running, open **Settings → Sync Backend**, enter the server URL and your username, and register an account from within the game.
+Once the server is running, open **Settings → Sync Backend**, enter the
+server URL and your username, and register an account from within the
+game.
 
 ## Running Tests
 
 ```bash
-# All tests
+# All tests (982 passing as of v0.11.0)
 cargo test --workspace
 
 # Just game logic (no display required)
 cargo test -p solitaire_core -p solitaire_sync -p solitaire_data -p solitaire_server
 
 # Lint
-cargo clippy --workspace -- -D warnings
+cargo clippy --workspace --all-targets -- -D warnings
 ```
 
 ## Credits
 
-Built on [Bevy](https://bevyengine.org/) and the wider Rust ecosystem (Tokio,
-Axum, sqlx, Serde, kira, and many more). Card faces and the default card back
-use xCards artwork (LGPL-3.0); the UI font is FiraMono-Medium (OFL). All audio
-is synthesized programmatically by this project. See [CREDITS.md](CREDITS.md)
-for the full list and license details.
+Built on [Bevy](https://bevyengine.org/) and the wider Rust ecosystem
+(Tokio, Axum, sqlx, Serde, kira, and many more). Card faces come from
+[hayeah/playing-cards-assets](https://github.com/hayeah/playing-cards-assets)
+(MIT, derived from the public-domain `vector-playing-cards` library); the
+default card back is original work; the UI font is FiraMono-Medium (OFL).
+All audio is synthesized programmatically by this project. See
+[CREDITS.md](CREDITS.md) for the full list and license details.
+
+## Changelog
+
+See [CHANGELOG.md](CHANGELOG.md).
 
 ## License
 

SESSION_HANDOFF.md

@@ -1,121 +1,180 @@
-# Solitaire Quest — UX Overhaul Session Handoff
+# Solitaire Quest — Session Handoff
 
-**Last updated:** 2026-05-01 — Phases 3, 4, and 5 all shipped. Smoke-test bugs closed. v1 release-readiness scope is essentially done; remaining work is the v0.1.0 tag plus desktop packaging.
+**Last updated:** 2026-05-06 (post-v0.19.0) — Tagged + pushed at
+`6037596`. v0.19.0 closes the v0.18.0 punch list (async H-key hint,
+persistent replay share URLs), expands desktop platform fit (Wayland
+session support + monitor-aware default window size), polishes the
+win-celebration and double-click animation paths, and clears two
+test-flake contributors. A short-lived "Rusty Pixel" pixel-art card
+theme was prototyped and reverted in the same window.
 
 ## Status at pause
 
-- **HEAD:** `902560c` — local master is **up to date** with `origin/master`.
-- **Working tree:** clean.
-- **Build:** `cargo clippy --workspace --all-targets -- -D warnings` clean.
-- **Tests:** **906 passed / 0 failed** across the workspace.
+- **HEAD on origin:** `6037596` (post-tag commit; the tag itself
+  points at this commit).
+- **Working tree:** modified — `CHANGELOG.md` and
+  `SESSION_HANDOFF.md` carry the v0.19.0 promotion + this refresh,
+  ready to commit.
+- **Build:** `cargo clippy --workspace --all-targets -- -D warnings`
+  clean (verified this session).
+- **Tests:** **1170 passing / 0 failing** across the workspace
+  (verified this session). One known flake remains:
+  `solitaire_engine::sync_plugin::tests::pull_failure_sets_error_status`
+  occasionally fails when cargo-test parallelism starves the
+  `AsyncComputeTaskPool` within the test's 5-update budget. Same
+  shape as the auto-save flake before v0.19.0's hardening; could be
+  fixed similarly with a wall-clock-bounded loop.
+- **Tags on origin:** `v0.9.0` through `v0.18.0` (v0.19.0 ready to
+  push once committed).
 
 ## Where we are
 
-Phase 3 (design tokens + modal scaffold) and Phase 4 (release polish) shipped earlier. Phase 5 — running the binary end-to-end and fixing what broke — landed nine more commits today: a layout fit fix so tableau columns stop spilling off-screen, a three-pronged resize-lag fix, persisted window geometry, splash skip on subsequent launches, achievement tooltips, a code-quality sweep, client-side sync round-trip tests, and a hit-test fix so dragging a card no longer requires aiming for the bottom strip.
+v0.18.0's resume-prompt menu (A–D) is closed:
 
-Polish is essentially complete; the remaining work is tagging v0.1.0 and desktop packaging.
+- ~~**A — Tag v0.18.0:**~~ shipped at `bfcd05f`.
+- ~~**B — Solver-on-`AsyncComputeTaskPool` for the H-key hint:**~~
+  shipped at `3e11e9e`.
+- **C — Desktop packaging:** still gated on artwork + signing
+  certs. Icon export PNGs (11 sizes, 16–1024 px) sit in
+  `artwork/` from the v0.18-era export; not yet wired into the
+  Bevy window or assembled into `.icns` / `.ico`. App icon is
+  the first natural step.
+- ~~**D — Persistent share link:**~~ shipped at `42d90b1`.
+
+The Rusty Pixel theme arc is documented as a sub-history but
+not part of v0.19.0's content:
+
+| Commit | Status |
+|---|---|
+| `de47511` PNG-format thumbnail support | reverted |
+| `17e3112` `pixel_art: bool` field + nearest-sampling opt-in | reverted |
+| `21ec03b` bundle Rusty Pixel as `embedded://` theme | reverted |
+| `aad8bb9` / `e41def8` / `0b3140a` reverts | landed |
+
+The arc remains in commit history for archaeology but the
+codebase reaches v0.19.0's HEAD identical to where it would be if
+the arc had never landed.
 
 ### Design direction (unchanged)
 
-- **Tone:** Balatro — chunky readable type, theatrical hierarchy, satisfying micro-interactions.
-- **Palette:** Midnight Purple base + Balatro yellow primary + warm magenta secondary.
-- See [memory/project_ux_overhaul_2026-04.md](.claude/projects/-home-manage-Rusty-Solitare/memory/project_ux_overhaul_2026-04.md) for full direction.
+- **Tone:** Balatro — chunky readable type, theatrical hierarchy,
+  satisfying micro-interactions.
+- **Palette:** Midnight Purple base + Balatro yellow primary + warm
+  magenta secondary.
 
-## Phase 3 (shipped)
+### Canonical remote
 
-- `solitaire_engine/src/ui_theme.rs` — every design token: colours, type scale, spacing scale, radius rungs, z-index hierarchy, motion durations.
-- `solitaire_engine/src/ui_modal.rs` — `spawn_modal` scaffold + button-variant helpers + `paint_modal_buttons` system.
-- All 12 overlays migrated to the modal scaffold with real Primary/Secondary/Tertiary buttons (no more Y/N debug prompts).
-- HUD restructured into a 4-tier vertical stack with progressive disclosure.
-- Animation upgrades: `SmoothSnap` slide curves, scoped settle bounce, deal jitter, win-cascade rotation.
+`github.com/funman300/Rusty_Solitaire` is the canonical repo.
+Always push there.
 
-## Phase 4 (shipped 2026-04-30)
+## v0.19.0 (2026-05-06)
 
-| Area | Commit | What landed |
+| Area | Commits | What landed |
 |---|---|---|
-| Workspace lint | `9bfca92` | Test-only clippy warnings under `--all-targets` resolved. |
-| App / window | `5f5aba8` | WM_CLASS, centered-on-primary window, panic hook → `crash.log`. |
-| Modal animation | `71999e1` | `ModalEntering` + ease-out scrim fade and 0.96→1.0 card scale. |
-| Score feedback | `dcfa976` | `ScorePulse` triangular 1.0→1.1→1.0; floating "+N" for jumps ≥ threshold. |
-| Hit targets | `b082bd6` | `ICON_BUTTON_PX` 28 → 32; sync status reads "local only". |
-| Microcopy | `abeb4e5` | Help "Close" → "Done"; final onboarding CTA → "Let's play". |
-| Empty states | `65d595a` | First-launch em-dash zero-stats grid + welcome line on Profile. |
-| Leaderboard | `1384365` | Idle/Loaded/Error enum; local-only guard. |
-| Credits | `fd7fb7b`, `f866299` | CREDITS.md added; README links it. |
-| Home | `c1bde18` | Home repurposed as Mode Launcher with level-5 lock state. |
-| Focus rings (Phase 1) | `1278952` | Tab/Shift-Tab/Enter on every modal button; auto-focus primary. |
-| Focus rings (Phase 2) | `51d3454` | HUD action bar (hover-gated) and Home mode cards. |
-| Focus rings (Phase 3) | `b78a493` | Settings: icon buttons, swatches, toggles; arrow-key `FocusRow`; auto-scroll. |
-| Achievement tests | `2e080d0` | Integration coverage for `draw_three_master` and `zen_winner`. |
-| Microcopy | `0c86cac` | "New game" / "Forfeit" replace "Yes, abandon" / "Yes, forfeit". |
-| Tooltip infra | `54d3497` | `Tooltip(Cow<'static, str>)` component + hover-delay overlay. |
-| HUD tooltips | `220e3f0` | 10 readouts + 6 action buttons. |
-| Settings tooltips | `74597a8` | Volume, toggles, swatches, Sync Now. |
-| Popover tooltips | `dbe6c60` | Modes and Menu rows. |
-| Splash | `5d57b67` | Branded splash overlay (300ms fade-in / ~1s hold / 300ms fade-out). |
-| Doc-rot | `73e210b` | ARCHITECTURE.md `bevy_kira_audio` references → `kira`. |
-| Doc | `de52c8a`, `60a8036` | Mid-session and end-of-Phase-4 SESSION_HANDOFF refreshes. |
+| Async H-key hint | `3e11e9e` | New `pending_hint.rs` module: `PendingHintTask` resource, `poll_pending_hint_task` + `drop_pending_hint_on_state_change` systems, cancel-on-replace, stale-state guard via `move_count_at_spawn`. Removes the last synchronous solver hot path. |
+| Persistent share URLs | `42d90b1` | `Replay.share_url: Option<String>` with `#[serde(default)]`. `poll_replay_upload_result` writes into `replays[0].share_url` + persists. Stats Copy button reads from selected replay. `LastSharedReplayUrl` deleted. |
+| Auto-save flake fix | `91b7605` | `test_app` clears `PendingRestoredGame(None)` after plugin build; test re-arms the timer in a bounded loop. No production-code change. |
+| Wayland support | `b57db01` | Adds `wayland` to Bevy features. winit prefers Wayland when `WAYLAND_DISPLAY` is set, falls back to X11. Native Wayland surface instead of XWayland frame. |
+| Smart default window size | `b57db01` | New `apply_smart_default_window_size` Update system queries `PrimaryMonitor` and resizes the window to ~70 % of monitor's logical size on the first frame. Skipped when saved geometry was applied. |
+| Win-celebration cleanup | `55c235b` | Drops the duplicate "You Win" toast that rendered behind the WinSummary modal. Cards-fly-off cascade kept; toast removed. |
+| Double-click reject animation | `d7ffb16` | Single-card double-clicks with no destination now play the same shake + sound as multi-card stack misses. Both priorities' failure paths converge on one `MoveRejectedEvent` write. |
+| Double-click animation dedup | `6037596` | Drops the redundant `StateChangedEvent` write in `end_drag`'s uncommitted-drag branch; previously raced an in-flight CardAnim and restarted the slide visibly. |
 
-## Phase 5 (shipped 2026-05-01)
+## Open punch list
 
-Smoke test surfaced three issues: window-resize lag, tableau columns clipped below viewport, hit-target offset on cards. All fixed, plus four bonus polish items.
+### Carried forward
 
-| Area | Commit | What landed |
-|---|---|---|
-| Layout fit | `8dda954` | `card_height` constrained by vertical budget; worst-case 13-card column always fits. |
-| Resize perf | `1719fda` | In-place sprite/text mutation + 50ms `ResizeThrottle` (was full re-spawn per pixel). |
-| Resize stall | `59316de` | `PresentMode::AutoNoVsync` eliminates the X11/Wayland vsync stall during drag. |
-| Window geometry | `6e7705b` | `WindowGeometry` persisted to settings.json; debounced save on resize/move. |
-| Achievements | `7448225` | Tooltips on rows: reward shown when unlocked, condition + reward when locked, secrets stay cryptic. |
-| Lint sweep | `4b9d008` | 33 pedantic warnings cleared (`map_unwrap_or`, `uninlined_format_args`, `match_same_arms`). |
-| Sync tests | `3ef4ecb` | Five client-side round-trip integration tests via in-process axum + mock keyring. |
-| Splash | `912b08c` | Splash skipped on subsequent launches via existing `first_run_complete` flag. |
-| Hit test | `902560c` | `card_position` mirrors face-down fan step (0.12) for accurate AABB on tableau columns. |
+- **Desktop packaging** per `ARCHITECTURE.md §17`. Eleven icon
+  PNG sizes (16, 24, 32, 48, 64, 96, 128, 192, 256, 512, 1024)
+  exported via `artwork/Icon Export.html` sit in `artwork/`
+  pending wiring. Pending: actual Bevy window-icon hookup,
+  macOS `.icns` assembly via `iconutil`, Windows `.ico` via
+  `magick convert`, Linux hicolor PNG hierarchy install,
+  AppImage recipe, macOS notarisation cert, Windows
+  Authenticode cert.
 
-## Open punch list for v1
+### Possible next-round candidates
 
-1. **`xCards` upstream URL** in CREDITS.md is intentionally absent (`f866299`). One-line fill-in when the project owner picks a canonical mirror/fork; LGPL notice obligations are already satisfied without it.
-2. **Tag `v0.1.0`** — workspace builds clean and tests are green; this is the next strategic milestone.
-3. **Desktop packaging** per ARCHITECTURE.md §17 — Docker compose for the server is documented; desktop client packaging (icon, .ico/.icns, signing, AppImage) is not yet done. Needs artwork and signing certs.
+- **App icon round** — wire the icon into the Bevy window via
+  `Window::icon`, generate `.icns` and `.ico` from the existing
+  PNGs. Half-day task; doesn't depend on signing certs.
+- **`pull_failure_sets_error_status` flake fix** — same pattern
+  as the auto-save flake. Wall-clock-bounded loop instead of
+  fixed 5-update budget. ~10 lines.
+- **Settings UI for "open at this size on launch"** — once the
+  smart-default-size system is shipping, expose a checkbox to
+  *disable* it (player who specifically wants 1280×800 every
+  time). Trivial.
+- **Persistent share link URL on selector caption** — surface
+  whether the currently-selected replay has a `share_url`
+  populated (e.g. "Replay 3 / 8 \u{2022} Shareable") so players
+  know which entries the Copy button can copy.
 
-### Optional, deferred
+### Process notes (from this round)
 
-- Animated focus ring (currently a static overlay; could pulse on focus change).
-- Achievement onboarding pass — show first-time players the achievement panel after their first win.
-- Mode-switch keyboard shortcut from inside the Mode Launcher (today only mouse opens it).
+- **Async port template (worked again):** the H-key port
+  followed `d489e7a`'s `PendingNewGameSeed` shape one-to-one
+  and the second async port required no new infrastructure.
+  Future async ports (e.g. moving `try_solve_with_first_move`'s
+  full-search variant, if it ever surfaces in the picker UI)
+  should follow the same shape.
+- **Rusty Pixel reverted cleanly:** `git revert` of three
+  contiguous feature commits produced a clean three-revert
+  sequence with no manual conflict resolution. Bisect remains
+  fast over the full v0.19.0 history because the reverts are
+  individual commits, not a squash.
+- **Defensive event writes pattern:** the
+  `auto_save_writes_after_30_seconds` flake AND the
+  `end_drag` double-animation bug shared a root cause:
+  defensive `MessageWriter` writes that originally covered an
+  edge case which no longer holds, but became load-bearing
+  once another system started paying attention to the event.
+  Worth a periodic pass: any event write that doesn't
+  correspond to a real state change is a candidate for
+  removal.
 
 ## Resume prompt
 
 ```
-You are a senior Rust + Bevy developer finishing v1 of Solitaire
-Quest. Working directory: /home/manage/Rusty_Solitare. Branch:
-master. The polish phase is complete; the remaining work is release
-prep, not new features.
+You are a senior Rust + Bevy developer working on Solitaire Quest.
+Working directory: <Rusty_Solitaire clone path on this machine>.
+Branch: master. v0.19.0 just shipped. The next natural item is
+desktop-packaging follow-through, starting with the app icon.
 
-State: HEAD=902560c, fully pushed to origin. Working tree clean.
-Build: cargo clippy --workspace --all-targets -- -D warnings clean.
-Tests: 906 passed / 0 failed.
+State: HEAD at 6037596 + the v0.19.0 docs commit on top (this
+session). Tag v0.19.0 points at the docs commit.
 
 READ FIRST (in order, before doing anything):
-  1. SESSION_HANDOFF.md  — full state and punch list
-  2. CLAUDE.md           — hard rules (UI-first, no panics, etc.)
-  3. ARCHITECTURE.md §15, §17 — platform targets, deployment guide
-  4. ~/.claude/projects/-home-manage-Rusty-Solitare/memory/MEMORY.md
+  1. SESSION_HANDOFF.md  — this file
+  2. CHANGELOG.md        — [Unreleased] is empty; [0.19.0] just landed
+  3. CLAUDE.md           — unified-3.0 rule set
+  4. CLAUDE_SPEC.md      — formal architecture spec
+  5. ARCHITECTURE.md     — crate responsibilities + data flow
+  6. ~/.claude/projects/<this-project>/memory/MEMORY.md
                          — saved feedback / project context
+                           (machine-local; may be missing on a
+                           fresh machine)
 
-PUNCH LIST (in priority order):
-  1. Confirm or fill the xCards upstream URL in CREDITS.md (one-line
-     edit; not a release blocker).
-  2. Tag v0.1.0 once the user signs off.
-  3. Desktop packaging: icon hookup, platform bundles (.ico/.icns/
-     AppImage), signing. Needs artwork and certs from the user.
+DECISION TO ASK THE PLAYER FIRST:
+  A. App icon — wire artwork/icon-{size}.png into Bevy's
+     Window::icon, generate .icns + .ico, drop into Linux
+     hicolor hierarchy. Half-day task. No cert dependency.
+  B. Desktop packaging continued — AppImage recipe, .desktop
+     file, install scripts. Larger task; unlocks distro
+     packaging. No cert dependency.
+  C. macOS / Windows signing cert acquisition — needs user
+     action; agent can't drive.
+  D. `pull_failure_sets_error_status` flake fix — small, well-
+     scoped. Same pattern as the v0.19.0 auto-save flake fix.
 
 WORKFLOW NOTES:
-  - Commits use:
-      git -c user.name=funman300 -c user.email=root@vscode.infinity commit -m "..."
+  - Use the system git config (already correct).
+  - When attributing playtester feedback in commits/docs, use
+    "Quat" not "Rhys" (saved feedback memory).
   - Sub-agents stage + verify only; orchestrator commits.
-  - Every commit must pass build / clippy / test.
+  - Every commit must pass build / clippy / test before pushing.
+  - Push to GitHub (origin) — gh auth setup-git is already
+    wired on this machine.
 
-OPEN AT THE START: ask which punch-list item to start on. Don't pick
-unilaterally — release-readiness ordering is the user's call.
+OPEN AT THE START: ask which of A–D. Don't pick unilaterally.
 ```

docs/SESSION_HANDOFF.md

@@ -1,7 +1,7 @@
 # Solitaire Quest — Session Handoff
 
 > Last updated: 2026-04-25
-> Branch: `master` — pushed to https://git.aleshym.co/funman300/Rusty_Solitare.git
+> Branch: `master` — pushed to https://github.com/funman300/Rusty_Solitaire.git
 > Test count: **242 passing** (83 core + 60 data + 99 engine), `cargo clippy --workspace -- -D warnings` clean
 
 ---

solitaire_app/src/main.rs

@@ -3,15 +3,19 @@ use std::io::Write;
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use bevy::prelude::*;
-use bevy::window::{MonitorSelection, PresentMode, WindowPosition};
+use bevy::window::{
+    Monitor, MonitorSelection, PresentMode, PrimaryMonitor, PrimaryWindow, WindowPosition,
+};
 use solitaire_data::{load_settings_from, provider_for_backend, settings_file_path, Settings};
 use solitaire_engine::{
-    AchievementPlugin, AnimationPlugin, AudioPlugin, AutoCompletePlugin, CardAnimationPlugin,
-    CardPlugin, ChallengePlugin, CursorPlugin, DailyChallengePlugin, FeedbackAnimPlugin,
-    FontPlugin, GamePlugin, HelpPlugin, HomePlugin, HudPlugin, InputPlugin, LeaderboardPlugin,
-    OnboardingPlugin, PausePlugin, ProfilePlugin, ProgressPlugin, SelectionPlugin, SettingsPlugin,
-    SplashPlugin, StatsPlugin, SyncPlugin, TablePlugin, TimeAttackPlugin, UiFocusPlugin,
-    UiModalPlugin, UiTooltipPlugin, WeeklyGoalsPlugin, WinSummaryPlugin,
+    register_theme_asset_sources, AchievementPlugin, AnimationPlugin, AssetSourcesPlugin,
+    AudioPlugin, AutoCompletePlugin, CardAnimationPlugin, CardPlugin, ChallengePlugin,
+    CursorPlugin, DailyChallengePlugin, FeedbackAnimPlugin, FontPlugin, GamePlugin, HelpPlugin,
+    HomePlugin, HudPlugin, InputPlugin, LeaderboardPlugin, OnboardingPlugin, PausePlugin,
+    ProfilePlugin, ProgressPlugin, RadialMenuPlugin, ReplayOverlayPlugin, ReplayPlaybackPlugin,
+    SelectionPlugin, SettingsPlugin, SplashPlugin,
+    StatsPlugin, SyncPlugin, TablePlugin, ThemePlugin, ThemeRegistryPlugin, TimeAttackPlugin,
+    UiFocusPlugin, UiModalPlugin, UiTooltipPlugin, WeeklyGoalsPlugin, WinSummaryPlugin,
 };
 
 fn main() {
@@ -41,8 +45,10 @@ fn main() {
 
     // Restore the previous window geometry if the player has one saved.
     // Otherwise open at the platform default (1280×800, centred on the
-    // primary monitor). The window_geometry field is None on first run
-    // and after upgrading from a build that didn't persist geometry.
+    // primary monitor) — `apply_smart_default_window_size` will resize
+    // up to a monitor-relative target on the first frame so HiDPI / 4K
+    // sessions don't end up with a comparatively tiny window.
+    let had_saved_geometry = settings.window_geometry.is_some();
     let (window_resolution, window_position) = match settings.window_geometry {
         Some(geom) => (
             (geom.width, geom.height).into(),
@@ -54,7 +60,17 @@ fn main() {
         ),
     };
 
-    App::new()
+    let mut app = App::new();
+
+    // The card-theme system's `themes://` asset source must be
+    // registered *before* `DefaultPlugins` builds `AssetPlugin`,
+    // because that plugin freezes the asset-source list at build
+    // time. The matching `AssetSourcesPlugin` (added below) finishes
+    // the wiring after `DefaultPlugins` by populating the embedded
+    // default theme into Bevy's `EmbeddedAssetRegistry`.
+    register_theme_asset_sources(&mut app);
+
+    app
         .add_plugins(
             DefaultPlugins
                 .set(WindowPlugin {
@@ -91,17 +107,23 @@ fn main() {
                     ..default()
                 }),
         )
+        .add_plugins(AssetSourcesPlugin)
+        .add_plugins(ThemePlugin)
+        .add_plugins(ThemeRegistryPlugin)
         .add_plugins(FontPlugin)
         .add_plugins(GamePlugin)
         .add_plugins(TablePlugin)
         .add_plugins(CardPlugin)
         .add_plugins(CursorPlugin)
         .add_plugins(InputPlugin)
+        .add_plugins(RadialMenuPlugin)
         .add_plugins(SelectionPlugin)
         .add_plugins(AnimationPlugin)
         .add_plugins(FeedbackAnimPlugin)
         .add_plugins(CardAnimationPlugin)
         .add_plugins(AutoCompletePlugin)
+        .add_plugins(ReplayPlaybackPlugin)
+        .add_plugins(ReplayOverlayPlugin)
         .add_plugins(StatsPlugin::default())
         .add_plugins(ProgressPlugin::default())
         .add_plugins(AchievementPlugin::default())
@@ -111,7 +133,7 @@ fn main() {
         .add_plugins(TimeAttackPlugin)
         .add_plugins(HudPlugin)
         .add_plugins(HelpPlugin)
-        .add_plugins(HomePlugin)
+        .add_plugins(HomePlugin::default())
         .add_plugins(ProfilePlugin)
         .add_plugins(PausePlugin)
         .add_plugins(SettingsPlugin::default())
@@ -123,8 +145,78 @@ fn main() {
         .add_plugins(UiModalPlugin)
         .add_plugins(UiFocusPlugin)
         .add_plugins(UiTooltipPlugin)
-        .add_plugins(SplashPlugin)
-        .run();
+        .add_plugins(SplashPlugin);
+
+    // Smart default window sizing: when no saved geometry was loaded,
+    // resize the freshly-opened 1280×800 window to ~70 % of the primary
+    // monitor's logical size on the first frame. Without this, a 4K
+    // monitor opens the same 1280×800 window that a 1080p monitor
+    // does — visually tiny relative to screen. Skipped entirely when
+    // saved geometry was applied; the player's preference always wins.
+    if !had_saved_geometry {
+        app.add_systems(Update, apply_smart_default_window_size);
+    }
+
+    app.run();
+}
+
+/// One-shot Update system that runs only on launches without saved
+/// window geometry. Resizes the primary window to a fraction of the
+/// primary monitor's *logical* size — bigger monitors get bigger
+/// windows automatically. Logical size already accounts for the OS's
+/// HiDPI scale factor, so a 2880×1800 Retina display reporting
+/// scale_factor 2.0 yields a 1440×900 logical size and a 1008×630
+/// target window — same physical inches as a 1920×1080 monitor with
+/// scale_factor 1.0 yielding 1344×756.
+///
+/// Uses `Local<bool>` to make itself one-shot rather than introducing
+/// a dedicated resource. The Update tick is necessary because Bevy
+/// populates the `Monitor` entities asynchronously after winit's
+/// Resumed event fires; they may not exist on the first Startup pass.
+fn apply_smart_default_window_size(
+    mut applied: Local<bool>,
+    monitors: Query<&Monitor, With<PrimaryMonitor>>,
+    mut windows: Query<&mut Window, With<PrimaryWindow>>,
+) {
+    if *applied {
+        return;
+    }
+    let Ok(monitor) = monitors.single() else {
+        // Primary monitor not yet spawned by bevy_winit. Try again
+        // next frame; the cost is one early-exit per tick until
+        // monitors arrive (typically frame 1 or 2).
+        return;
+    };
+    let Ok(mut window) = windows.single_mut() else {
+        return;
+    };
+
+    let scale = monitor.scale_factor as f32;
+    if scale <= 0.0 {
+        // Defensive: a zero or negative scale factor would NaN the
+        // arithmetic below. Bail and accept the default size.
+        *applied = true;
+        return;
+    }
+    let logical_w = monitor.physical_width as f32 / scale;
+    let logical_h = monitor.physical_height as f32 / scale;
+
+    // Target 70 % of monitor in each dimension, clamped to the
+    // existing 800×600 minimum and the monitor's own logical size
+    // (so we never request a window larger than the screen).
+    let target_w = (logical_w * 0.7).clamp(800.0, logical_w);
+    let target_h = (logical_h * 0.7).clamp(600.0, logical_h);
+
+    // Resize only when the change is meaningful — at exactly 1280×800
+    // on a 1920×1080 monitor the new target is 1344×756 (only ~5 %
+    // wider), worth the resize; at the same default on an 800×600
+    // monitor the clamp pins us at 800×600 and we shouldn't resize.
+    let curr_w = window.resolution.width();
+    let curr_h = window.resolution.height();
+    if (curr_w - target_w).abs() > 8.0 || (curr_h - target_h).abs() > 8.0 {
+        window.resolution.set(target_w, target_h);
+    }
+    *applied = true;
 }
 
 /// Wraps the default panic hook with one that also appends a crash log

solitaire_assetgen/src/bin/gen_sfx.rs

@@ -16,13 +16,14 @@ fn main() -> io::Result<()> {
     let out_dir = workspace_root().join("assets").join("audio");
     fs::create_dir_all(&out_dir)?;
 
-    let effects: [(&str, Generator); 6] = [
+    let effects: [(&str, Generator); 7] = [
         ("card_flip.wav", card_flip),
         ("card_place.wav", card_place),
         ("card_deal.wav", card_deal),
         ("card_invalid.wav", card_invalid),
         ("win_fanfare.wav", win_fanfare),
         ("ambient_loop.wav", ambient_loop),
+        ("foundation_complete.wav", foundation_complete),
     ];
 
     for (name, make) in &effects {
@@ -170,6 +171,44 @@ fn win_fanfare() -> Vec<i16> {
     out
 }
 
+/// Per-suit foundation-completion ping (~240 ms): a rising three-note
+/// chime — C6, E6, G6 — with a soft 2nd-harmonic warm layer on each
+/// note. Shorter and brighter than `win_fanfare` so it can fire up to
+/// four times per game (once per suit) without drowning out subsequent
+/// move sounds. The fourth firing co-occurs with the win cascade and
+/// `win_fanfare`; the C-major triad sits an octave above the
+/// fanfare's root so the two layer cleanly instead of fighting for the
+/// same frequency band.
+fn foundation_complete() -> Vec<i16> {
+    // C major triad, one octave up from win_fanfare's root.
+    let notes = [1046.50_f32, 1318.51, 1567.98]; // C6, E6, G6
+    let note_dur = 0.07_f32; // brisk, ascending
+    let total = note_dur * notes.len() as f32 + 0.05;
+    let n = duration_samples(total);
+    let mut out = Vec::with_capacity(n);
+    for i in 0..n {
+        let t = i as f32 / SAMPLE_RATE as f32;
+        let mut sample = 0.0f32;
+        for (idx, freq) in notes.iter().enumerate() {
+            let start = idx as f32 * note_dur;
+            let local = t - start;
+            // Each note rings out for 0.18 s — overlapping notes form a
+            // brief chord at the tail.
+            if !(0.0..=0.18).contains(&local) {
+                continue;
+            }
+            // Sine + soft 2nd harmonic for warmth, ar_envelope decays
+            // sharply so each note is bell-like rather than sustained.
+            let s = (2.0 * std::f32::consts::PI * freq * local).sin()
+                + 0.25 * (2.0 * std::f32::consts::PI * freq * 2.0 * local).sin();
+            let env = ar_envelope(local, 0.005, 0.18, 14.0);
+            sample += s * env;
+        }
+        out.push(quantize(sample * 0.20));
+    }
+    out
+}
+
 /// Generates a seamlessly looping ambient drone track (~6 seconds, 44100 Hz
 /// mono 16-bit PCM).
 ///

solitaire_core/Cargo.toml

@@ -6,6 +6,5 @@ edition.workspace = true
 
 [dependencies]
 serde     = { workspace = true }
-chrono    = { workspace = true }
 thiserror = { workspace = true }
 rand      = { workspace = true }

solitaire_core/src/achievement.rs

@@ -140,6 +140,16 @@ fn comeback(c: &AchievementContext) -> bool {
 fn zen_winner(c: &AchievementContext) -> bool {
     c.last_win_is_zen
 }
+/// Cinephile is event-driven: it unlocks when the engine observes a
+/// `ReplayPlaybackState` transition from `Playing` to `Completed`, not on
+/// any field of [`AchievementContext`]. The condition predicate therefore
+/// always returns false so [`check_achievements`] never unlocks it from a
+/// `GameWonEvent` / `StateChangedEvent` cycle — the unlock is driven by
+/// `AchievementUnlockedEvent` written directly from the engine's
+/// replay-playback observer.
+fn cinephile_never(_c: &AchievementContext) -> bool {
+    false
+}
 
 /// All currently-evaluable achievements. Order is stable so persistence files
 /// remain readable across versions (new achievements append).
@@ -288,6 +298,18 @@ pub const ALL_ACHIEVEMENTS: &[AchievementDef] = &[
         reward: Some(Reward::Badge),
         condition: zen_winner,
     },
+    AchievementDef {
+        id: "cinephile",
+        name: "Cinephile",
+        description: "Watch a saved replay all the way through",
+        secret: false,
+        reward: None,
+        // Event-driven unlock: the engine's replay-playback observer fires
+        // `AchievementUnlockedEvent("cinephile")` directly on a Playing →
+        // Completed transition. `cinephile_never` keeps the condition path
+        // a no-op so a `GameWonEvent` evaluation cycle cannot unlock it.
+        condition: cinephile_never,
+    },
 ];
 
 /// Return every `AchievementDef` whose condition is satisfied by `ctx`.
@@ -721,6 +743,31 @@ mod tests {
         assert!(ids.contains(&"no_undo"), "no_undo must also unlock when perfectionist does");
     }
 
+    #[test]
+    fn cinephile_achievement_in_canonical_list() {
+        let def = achievement_by_id("cinephile").expect("cinephile must be registered");
+        assert_eq!(def.id, "cinephile");
+        assert_eq!(def.name, "Cinephile");
+        assert!(!def.secret, "cinephile is not a secret achievement");
+        // Event-driven: the predicate is a sentinel that always returns
+        // false. `check_achievements` must never unlock cinephile from a
+        // GameWonEvent context, even one that satisfies every other gate.
+        let mut c = ctx();
+        c.games_won = 1;
+        c.win_streak_current = 999;
+        c.last_win_time_seconds = 1;
+        c.last_win_used_undo = false;
+        c.best_single_score = 99_999;
+        c.lifetime_score = u64::MAX;
+        c.last_win_is_zen = true;
+        c.last_win_recycle_count = 99;
+        let ids: Vec<&str> = check_achievements(&c).iter().map(|d| d.id).collect();
+        assert!(
+            !ids.contains(&"cinephile"),
+            "cinephile must never unlock via condition evaluation; got {ids:?}",
+        );
+    }
+
     #[test]
     fn perfectionist_score_well_above_threshold_still_passes() {
         let mut c = ctx();

solitaire_core/src/card.rs

@@ -77,16 +77,6 @@ pub struct Card {
 mod tests {
     use super::*;
 
-    #[test]
-    fn rank_value_ace_is_one() {
-        assert_eq!(Rank::Ace.value(), 1);
-    }
-
-    #[test]
-    fn rank_value_king_is_thirteen() {
-        assert_eq!(Rank::King.value(), 13);
-    }
-
     #[test]
     fn rank_values_are_sequential() {
         let ranks = [
@@ -100,26 +90,11 @@ mod tests {
     }
 
     #[test]
-    fn suit_red_is_diamonds_and_hearts() {
-        assert!(Suit::Diamonds.is_red());
-        assert!(Suit::Hearts.is_red());
-        assert!(!Suit::Clubs.is_red());
-        assert!(!Suit::Spades.is_red());
-    }
-
-    #[test]
-    fn suit_black_is_clubs_and_spades() {
-        assert!(Suit::Clubs.is_black());
-        assert!(Suit::Spades.is_black());
-        assert!(!Suit::Diamonds.is_black());
-        assert!(!Suit::Hearts.is_black());
-    }
-
-    #[test]
-    fn card_face_up_field_reflects_construction() {
-        let card = Card { id: 0, suit: Suit::Hearts, rank: Rank::Ace, face_up: false };
-        assert!(!card.face_up);
-        let card2 = Card { id: 1, suit: Suit::Spades, rank: Rank::King, face_up: true };
-        assert!(card2.face_up);
+    fn suit_red_and_black_are_complementary() {
+        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
+            assert_ne!(suit.is_red(), suit.is_black(), "{suit:?} must be exactly one of red/black");
+        }
+        assert!(Suit::Diamonds.is_red() && Suit::Hearts.is_red());
+        assert!(Suit::Clubs.is_black() && Suit::Spades.is_black());
     }
 }

solitaire_core/src/game_state.rs

@@ -1,14 +1,28 @@
 use std::collections::{HashMap, VecDeque};
 use serde::{Deserialize, Serialize};
-use crate::card::{Card, Suit};
+use crate::card::Card;
 use crate::deck::{deal_klondike, Deck};
 use crate::error::MoveError;
 use crate::pile::{Pile, PileType};
-use crate::rules::{can_place_on_foundation, can_place_on_tableau};
+use crate::rules::{can_place_on_foundation, can_place_on_tableau, is_valid_tableau_sequence};
 use crate::scoring::{compute_time_bonus as scoring_time_bonus, score_move, score_undo as scoring_undo};
 
 const MAX_UNDO_STACK: usize = 64;
 
+/// Save-file schema version for `GameState`. Increment when the on-disk
+/// representation changes incompatibly so `load_game_state_from` can refuse
+/// older formats and start the player on a fresh game.
+///
+/// History:
+/// - v1: `Foundation(Suit)` keys.
+/// - v2 (current): `Foundation(u8)` slot keys; claimed suit derived from the
+///   bottom card of the pile.
+pub const GAME_STATE_SCHEMA_VERSION: u32 = 2;
+
+/// Default value for `GameState::schema_version` when deserialising older
+/// save files that pre-date the field.
+fn schema_v1() -> u32 { 1 }
+
 /// Serialize `HashMap<PileType, Pile>` as a `Vec` of `(key, value)` pairs so
 /// that JSON (which requires string map keys) round-trips correctly.
 mod pile_map_serde {
@@ -98,6 +112,11 @@ pub struct GameState {
     /// Used by the `comeback` achievement condition.
     #[serde(default)]
     pub recycle_count: u32,
+    /// Save-file schema version. Defaults to `1` for older files that pre-date
+    /// the field. The loader refuses any value other than
+    /// [`GAME_STATE_SCHEMA_VERSION`].
+    #[serde(default = "schema_v1")]
+    pub schema_version: u32,
     undo_stack: VecDeque<StateSnapshot>,
 }
 
@@ -116,8 +135,8 @@ impl GameState {
         let mut piles: HashMap<PileType, Pile> = HashMap::new();
         piles.insert(PileType::Stock, stock);
         piles.insert(PileType::Waste, Pile::new(PileType::Waste));
-        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
-            piles.insert(PileType::Foundation(suit), Pile::new(PileType::Foundation(suit)));
+        for slot in 0..4_u8 {
+            piles.insert(PileType::Foundation(slot), Pile::new(PileType::Foundation(slot)));
         }
         for (i, pile) in tableau.into_iter().enumerate() {
             piles.insert(PileType::Tableau(i), pile);
@@ -135,6 +154,7 @@ impl GameState {
             is_auto_completable: false,
             undo_count: 0,
             recycle_count: 0,
+            schema_version: GAME_STATE_SCHEMA_VERSION,
             undo_stack: VecDeque::new(),
         }
     }
@@ -247,14 +267,14 @@ impl GameState {
             let bottom_card = from_pile.cards[start].clone();
 
             match &to {
-                PileType::Foundation(suit) => {
+                PileType::Foundation(_) => {
                     if count != 1 {
                         return Err(MoveError::RuleViolation(
                             "only one card can move to foundation at a time".into(),
                         ));
                     }
                     let dest = self.piles.get(&to).ok_or(MoveError::InvalidDestination)?;
-                    if !can_place_on_foundation(&bottom_card, dest, *suit) {
+                    if !can_place_on_foundation(&bottom_card, dest) {
                         return Err(MoveError::RuleViolation("invalid foundation placement".into()));
                     }
                 }
@@ -263,6 +283,18 @@ impl GameState {
                     if !can_place_on_tableau(&bottom_card, dest) {
                         return Err(MoveError::RuleViolation("invalid tableau placement".into()));
                     }
+                    // The previous check only validates that the *bottom* of the
+                    // moved stack lands on the destination's top card. Without
+                    // this guard, a player could lift an arbitrary multi-card
+                    // selection from one column and drop it onto another whenever
+                    // the bottom card happens to match — even if the cards
+                    // above the bottom don't form a legal descending
+                    // alternating-colour run.
+                    if !is_valid_tableau_sequence(&from_pile.cards[start..]) {
+                        return Err(MoveError::RuleViolation(
+                            "moved cards must form a valid tableau run".into(),
+                        ));
+                    }
                 }
                 _ => return Err(MoveError::InvalidDestination),
             }
@@ -332,15 +364,13 @@ impl GameState {
         Ok(())
     }
 
-    /// Returns `true` when all four foundations each contain 13 cards.
+    /// Returns `true` when all four foundation slots each contain 13 cards.
     pub fn check_win(&self) -> bool {
-        [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades]
-            .iter()
-            .all(|&suit| {
-                self.piles
-                    .get(&PileType::Foundation(suit))
-                    .is_some_and(|p| p.cards.len() == 13)
-            })
+        (0..4_u8).all(|slot| {
+            self.piles
+                .get(&PileType::Foundation(slot))
+                .is_some_and(|p| p.cards.len() == 13)
+        })
     }
 
     /// Returns `true` when stock and waste are empty and all tableau cards are face-up.
@@ -379,13 +409,34 @@ impl GameState {
         if !self.is_auto_completable || self.is_won {
             return None;
         }
-        let suits = [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades];
         for i in 0..7 {
             let tableau = PileType::Tableau(i);
             if let Some(card) = self.piles[&tableau].cards.last() {
-                for &suit in &suits {
-                    let foundation = PileType::Foundation(suit);
-                    if can_place_on_foundation(card, &self.piles[&foundation], suit) {
+                // Prefer the slot that already claims this card's suit so
+                // Aces don't sometimes land in slot 0 and then leave the
+                // matching suit-claimed slot empty.
+                let mut candidate: Option<u8> = None;
+                let mut empty_slot: Option<u8> = None;
+                for slot in 0..4_u8 {
+                    let foundation = PileType::Foundation(slot);
+                    let pile = &self.piles[&foundation];
+                    if pile.cards.is_empty() {
+                        if empty_slot.is_none() {
+                            empty_slot = Some(slot);
+                        }
+                    } else if pile.claimed_suit() == Some(card.suit) {
+                        candidate = Some(slot);
+                        break;
+                    }
+                }
+                let target_slot = candidate.or_else(|| {
+                    // Only fall back to an empty slot if the card is an Ace,
+                    // which is the only rank that can claim an empty slot.
+                    if card.rank.value() == 1 { empty_slot } else { None }
+                });
+                if let Some(slot) = target_slot {
+                    let foundation = PileType::Foundation(slot);
+                    if can_place_on_foundation(card, &self.piles[&foundation]) {
                         return Some((tableau, foundation));
                     }
                 }
@@ -403,7 +454,7 @@ impl GameState {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::card::{Card, Rank};
+    use crate::card::{Card, Rank, Suit};
 
     fn new_game() -> GameState {
         GameState::new(42, DrawMode::DrawOne)
@@ -434,8 +485,8 @@ mod tests {
     #[test]
     fn new_game_foundations_are_empty() {
         let g = new_game();
-        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
-            assert!(g.piles[&PileType::Foundation(suit)].cards.is_empty());
+        for slot in 0..4_u8 {
+            assert!(g.piles[&PileType::Foundation(slot)].cards.is_empty());
         }
     }
 
@@ -662,7 +713,7 @@ mod tests {
         ];
         let result = g.move_cards(
             PileType::Tableau(0),
-            PileType::Foundation(Suit::Clubs),
+            PileType::Foundation(0),
             2,
         );
         assert!(
@@ -706,8 +757,9 @@ mod tests {
     #[test]
     fn win_detection_all_foundations_complete() {
         let mut g = new_game();
-        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
-            let f = g.piles.get_mut(&PileType::Foundation(suit)).unwrap();
+        let suits = [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades];
+        for (slot, suit) in suits.into_iter().enumerate() {
+            let f = g.piles.get_mut(&PileType::Foundation(slot as u8)).unwrap();
             f.cards.clear();
             for rank in [
                 Rank::Ace, Rank::Two, Rank::Three, Rank::Four, Rank::Five,
@@ -763,11 +815,6 @@ mod tests {
         assert!(g.undo_stack_len() <= 64);
     }
 
-    #[test]
-    fn undo_count_starts_at_zero() {
-        assert_eq!(new_game().undo_count, 0);
-    }
-
     #[test]
     fn undo_count_increments_on_each_undo() {
         let mut g = new_game();
@@ -848,11 +895,6 @@ mod tests {
         assert_eq!(g.score, 0);
     }
 
-    #[test]
-    fn zen_mode_default_is_classic_via_default_trait() {
-        assert_eq!(GameMode::default(), GameMode::Classic);
-    }
-
     #[test]
     fn zen_mode_field_persists_through_construction() {
         let g = GameState::new_with_mode(1, DrawMode::DrawThree, GameMode::Zen);
@@ -904,12 +946,6 @@ mod tests {
         assert!(g.undo().is_ok(), "undo must be permitted in TimeAttack mode");
     }
 
-    #[test]
-    fn time_attack_score_starts_at_zero() {
-        let g = GameState::new_with_mode(42, DrawMode::DrawOne, GameMode::TimeAttack);
-        assert_eq!(g.score, 0);
-    }
-
     #[test]
     fn time_attack_draw_three_combination() {
         // TimeAttack + DrawThree is a valid combination; verify construction.
@@ -1039,7 +1075,8 @@ mod tests {
 
         let mv = g.next_auto_complete_move().expect("should find a move");
         assert_eq!(mv.0, PileType::Tableau(0));
-        assert_eq!(mv.1, PileType::Foundation(Suit::Clubs));
+        // Slot 0 is the first empty foundation; the Ace lands there.
+        assert_eq!(mv.1, PileType::Foundation(0));
     }
 
     #[test]
@@ -1049,4 +1086,143 @@ mod tests {
         g.is_won = true;
         assert!(g.next_auto_complete_move().is_none());
     }
+
+    // --- Slot-based foundation behaviour (refactor coverage) ---
+
+    /// Aces land in the first empty slot regardless of suit, and successive
+    /// Aces fan out across slots 0, 1, 2, 3 in deterministic order.
+    #[test]
+    fn any_ace_lands_in_first_empty_foundation() {
+        let mut g = new_game();
+        // Clear stock/waste/tableau so we can hand-construct moves directly.
+        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
+        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
+        for i in 0..7 {
+            g.piles.get_mut(&PileType::Tableau(i)).unwrap().cards.clear();
+        }
+        // Place an Ace of Clubs on tableau 0; move it to slot 0.
+        g.piles.get_mut(&PileType::Tableau(0)).unwrap().cards.push(Card {
+            id: 1, suit: Suit::Clubs, rank: Rank::Ace, face_up: true,
+        });
+        g.move_cards(PileType::Tableau(0), PileType::Foundation(0), 1).unwrap();
+        // Now place an Ace of Spades on tableau 0 and move it to slot 1.
+        g.piles.get_mut(&PileType::Tableau(0)).unwrap().cards.push(Card {
+            id: 2, suit: Suit::Spades, rank: Rank::Ace, face_up: true,
+        });
+        g.move_cards(PileType::Tableau(0), PileType::Foundation(1), 1).unwrap();
+
+        assert_eq!(g.piles[&PileType::Foundation(0)].claimed_suit(), Some(Suit::Clubs));
+        assert_eq!(g.piles[&PileType::Foundation(1)].claimed_suit(), Some(Suit::Spades));
+    }
+
+    /// `Pile::claimed_suit` reads the bottom card's suit on a populated
+    /// foundation slot, regardless of which slot index the pile occupies.
+    #[test]
+    fn claimed_suit_is_derived_from_bottom_card() {
+        let mut g = new_game();
+        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
+        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
+        for i in 0..7 {
+            g.piles.get_mut(&PileType::Tableau(i)).unwrap().cards.clear();
+        }
+        g.piles.get_mut(&PileType::Tableau(0)).unwrap().cards.push(Card {
+            id: 50, suit: Suit::Hearts, rank: Rank::Ace, face_up: true,
+        });
+        g.move_cards(PileType::Tableau(0), PileType::Foundation(2), 1).unwrap();
+
+        assert_eq!(
+            g.piles[&PileType::Foundation(2)].claimed_suit(),
+            Some(Suit::Hearts)
+        );
+    }
+
+    /// Undoing the only card from a foundation slot drops the claimed suit;
+    /// the slot then accepts a different Ace.
+    #[test]
+    fn foundation_claim_drops_when_emptied_via_undo() {
+        let mut g = new_game();
+        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
+        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
+        for i in 0..7 {
+            g.piles.get_mut(&PileType::Tableau(i)).unwrap().cards.clear();
+        }
+        g.piles.get_mut(&PileType::Tableau(0)).unwrap().cards.push(Card {
+            id: 1, suit: Suit::Hearts, rank: Rank::Ace, face_up: true,
+        });
+        g.move_cards(PileType::Tableau(0), PileType::Foundation(0), 1).unwrap();
+        assert_eq!(g.piles[&PileType::Foundation(0)].claimed_suit(), Some(Suit::Hearts));
+
+        g.undo().unwrap();
+        assert!(g.piles[&PileType::Foundation(0)].cards.is_empty());
+        assert!(g.piles[&PileType::Foundation(0)].claimed_suit().is_none());
+
+        // A different Ace can now claim slot 0.
+        let t0 = g.piles.get_mut(&PileType::Tableau(0)).unwrap();
+        t0.cards.clear();
+        t0.cards.push(Card { id: 2, suit: Suit::Spades, rank: Rank::Ace, face_up: true });
+        g.move_cards(PileType::Tableau(0), PileType::Foundation(0), 1).unwrap();
+        assert_eq!(g.piles[&PileType::Foundation(0)].claimed_suit(), Some(Suit::Spades));
+    }
+
+    /// Successive Aces from the waste pile distribute across slots 0..=3 in
+    /// order — the player picks the slot, but `move_cards` accepts any
+    /// empty-slot placement for an Ace.
+    #[test]
+    fn multiple_aces_distribute_across_slots() {
+        let mut g = new_game();
+        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
+        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
+        for i in 0..7 {
+            g.piles.get_mut(&PileType::Tableau(i)).unwrap().cards.clear();
+        }
+        let aces = [
+            (Suit::Clubs, 10),
+            (Suit::Diamonds, 11),
+            (Suit::Hearts, 12),
+            (Suit::Spades, 13),
+        ];
+        for (slot, (suit, id)) in aces.iter().enumerate() {
+            g.piles.get_mut(&PileType::Waste).unwrap().cards.push(Card {
+                id: *id, suit: *suit, rank: Rank::Ace, face_up: true,
+            });
+            g.move_cards(PileType::Waste, PileType::Foundation(slot as u8), 1).unwrap();
+        }
+        for (slot, (suit, _)) in aces.iter().enumerate() {
+            assert_eq!(
+                g.piles[&PileType::Foundation(slot as u8)].claimed_suit(),
+                Some(*suit),
+                "slot {slot} should claim {suit:?}",
+            );
+        }
+    }
+
+    /// Auto-complete prefers the foundation slot whose claimed suit matches
+    /// the candidate card's suit, even if an empty slot exists at a lower
+    /// index.
+    #[test]
+    fn next_auto_complete_move_picks_slot_with_matching_claim() {
+        let mut g = new_game();
+        g.piles.get_mut(&PileType::Stock).unwrap().cards.clear();
+        g.piles.get_mut(&PileType::Waste).unwrap().cards.clear();
+        for i in 0..7 {
+            g.piles.get_mut(&PileType::Tableau(i)).unwrap().cards.clear();
+        }
+        // Slot 0 is empty; slot 1 already claims Hearts via Ace of Hearts.
+        g.piles.get_mut(&PileType::Foundation(1)).unwrap().cards.push(Card {
+            id: 1, suit: Suit::Hearts, rank: Rank::Ace, face_up: true,
+        });
+        // Tableau 0 holds the 2 of Hearts to play.
+        g.piles.get_mut(&PileType::Tableau(0)).unwrap().cards.push(Card {
+            id: 2, suit: Suit::Hearts, rank: Rank::Two, face_up: true,
+        });
+        g.is_auto_completable = true;
+
+        let mv = g.next_auto_complete_move().expect("auto-complete must find slot 1");
+        assert_eq!(mv.0, PileType::Tableau(0));
+        assert_eq!(
+            mv.1,
+            PileType::Foundation(1),
+            "must target the Hearts-claimed slot, not the empty slot 0",
+        );
+    }
 }

solitaire_core/src/lib.rs

@@ -6,3 +6,4 @@ pub mod game_state;
 pub mod pile;
 pub mod rules;
 pub mod scoring;
+pub mod solver;

solitaire_core/src/pile.rs

@@ -8,8 +8,10 @@ pub enum PileType {
     Stock,
     /// The face-up discard pile drawn to.
     Waste,
-    /// One of the four suit-ordered foundation piles.
-    Foundation(Suit),
+    /// One of the four foundation slots (0..=3). The claimed suit, if any,
+    /// is derived from the bottom card of the pile (always an Ace by
+    /// construction).
+    Foundation(u8),
     /// One of the seven tableau columns (0–6).
     Tableau(usize),
 }
@@ -17,7 +19,7 @@ pub enum PileType {
 /// A named collection of cards in a specific board position.
 #[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 pub struct Pile {
-    /// Which pile this is (Stock, Waste, Foundation suit, or Tableau column).
+    /// Which pile this is (Stock, Waste, Foundation slot, or Tableau column).
     pub pile_type: PileType,
     /// Cards in the pile, bottom-to-top stacking order. Last element is the top card.
     pub cards: Vec<Card>,
@@ -33,6 +35,16 @@ impl Pile {
     pub fn top(&self) -> Option<&Card> {
         self.cards.last()
     }
+
+    /// For foundation piles: returns `Some(suit)` once at least one card has
+    /// landed (the bottom card is always an Ace of the claimed suit).
+    /// Returns `None` for empty foundations or non-foundation piles.
+    pub fn claimed_suit(&self) -> Option<Suit> {
+        match self.pile_type {
+            PileType::Foundation(_) => self.cards.first().map(|c| c.suit),
+            _ => None,
+        }
+    }
 }
 
 #[cfg(test)]
@@ -61,12 +73,33 @@ mod tests {
     }
 
     #[test]
-    fn pile_type_foundation_uses_suit() {
-        assert_ne!(PileType::Foundation(Suit::Hearts), PileType::Foundation(Suit::Spades));
+    fn pile_type_foundation_uses_slot_index() {
+        assert_ne!(PileType::Foundation(0), PileType::Foundation(3));
     }
 
     #[test]
     fn pile_type_tableau_uses_index() {
         assert_ne!(PileType::Tableau(0), PileType::Tableau(6));
     }
+
+    #[test]
+    fn claimed_suit_is_none_for_empty_foundation() {
+        let pile = Pile::new(PileType::Foundation(0));
+        assert!(pile.claimed_suit().is_none());
+    }
+
+    #[test]
+    fn claimed_suit_is_none_for_non_foundation() {
+        let mut pile = Pile::new(PileType::Tableau(0));
+        pile.cards.push(Card { id: 0, suit: Suit::Hearts, rank: Rank::Ace, face_up: true });
+        assert!(pile.claimed_suit().is_none());
+    }
+
+    #[test]
+    fn claimed_suit_returns_bottom_card_suit() {
+        let mut pile = Pile::new(PileType::Foundation(2));
+        pile.cards.push(Card { id: 0, suit: Suit::Hearts, rank: Rank::Ace, face_up: true });
+        pile.cards.push(Card { id: 1, suit: Suit::Hearts, rank: Rank::Two, face_up: true });
+        assert_eq!(pile.claimed_suit(), Some(Suit::Hearts));
+    }
 }

solitaire_core/src/rules.rs

@@ -1,16 +1,18 @@
-use crate::card::{Card, Suit};
+use crate::card::Card;
 use crate::pile::Pile;
 
-/// Returns `true` if `card` can be placed on `pile` as the next card in the foundation for `suit`.
+/// Returns `true` if `card` can be placed on the foundation `pile`.
 ///
-/// Foundation rules: same suit, Ace starts, each subsequent card is one rank higher.
-pub fn can_place_on_foundation(card: &Card, pile: &Pile, suit: Suit) -> bool {
-    if card.suit != suit {
-        return false;
-    }
+/// Foundation rules:
+/// - When the pile is empty, any Ace is accepted; the placed Ace's suit
+///   becomes the pile's claimed suit (derived from the bottom card via
+///   [`Pile::claimed_suit`](crate::pile::Pile::claimed_suit)).
+/// - When the pile is non-empty, the next card must match the top card's
+///   suit and be exactly one rank higher.
+pub fn can_place_on_foundation(card: &Card, pile: &Pile) -> bool {
     match pile.cards.last() {
         None => card.rank.value() == 1,
-        Some(top) => card.rank.value() == top.rank.value() + 1,
+        Some(top) => card.suit == top.suit && card.rank.value() == top.rank.value() + 1,
     }
 }
 
@@ -28,6 +30,18 @@ pub fn can_place_on_tableau(card: &Card, pile: &Pile) -> bool {
     }
 }
 
+/// Returns `true` if `cards` is a legal tableau run on its own — every
+/// adjacent pair descends by one rank and alternates colour. A single
+/// card is trivially valid. The destination check is separate; this
+/// only validates the sequence's *internal* structure, which the tableau
+/// move path must enforce so a player can't smuggle an arbitrary stack
+/// onto another column when the bottom card happens to land legally.
+pub fn is_valid_tableau_sequence(cards: &[Card]) -> bool {
+    cards.windows(2).all(|w| {
+        w[0].rank.value() == w[1].rank.value() + 1 && w[0].suit.is_red() != w[1].suit.is_red()
+    })
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -45,37 +59,46 @@ mod tests {
     // Foundation tests
     #[test]
     fn foundation_ace_on_empty_is_valid() {
-        let c = card(Suit::Hearts, Rank::Ace);
-        let p = Pile::new(PileType::Foundation(Suit::Hearts));
-        assert!(can_place_on_foundation(&c, &p, Suit::Hearts));
+        // Every suit's Ace must land on an empty foundation slot regardless of
+        // its slot index; the slot claims the suit only after the Ace lands.
+        for suit in [Suit::Clubs, Suit::Diamonds, Suit::Hearts, Suit::Spades] {
+            let c = card(suit, Rank::Ace);
+            let p = Pile::new(PileType::Foundation(0));
+            assert!(
+                can_place_on_foundation(&c, &p),
+                "Ace of {suit:?} must land on empty slot 0",
+            );
+        }
     }
 
     #[test]
     fn foundation_non_ace_on_empty_is_invalid() {
         let c = card(Suit::Hearts, Rank::Two);
-        let p = Pile::new(PileType::Foundation(Suit::Hearts));
-        assert!(!can_place_on_foundation(&c, &p, Suit::Hearts));
+        let p = Pile::new(PileType::Foundation(0));
+        assert!(!can_place_on_foundation(&c, &p));
     }
 
     #[test]
     fn foundation_two_on_ace_same_suit_is_valid() {
         let c = card(Suit::Clubs, Rank::Two);
-        let p = pile_with(PileType::Foundation(Suit::Clubs), vec![card(Suit::Clubs, Rank::Ace)]);
-        assert!(can_place_on_foundation(&c, &p, Suit::Clubs));
+        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Clubs, Rank::Ace)]);
+        assert!(can_place_on_foundation(&c, &p));
     }
 
     #[test]
-    fn foundation_wrong_suit_is_invalid() {
-        let c = card(Suit::Hearts, Rank::Ace);
-        let p = Pile::new(PileType::Foundation(Suit::Spades));
-        assert!(!can_place_on_foundation(&c, &p, Suit::Spades));
+    fn foundation_second_card_must_match_claimed_suit() {
+        // Place Ace of Hearts on slot 0, then attempt 2 of Spades — rejected
+        // because the slot's claimed suit is Hearts after the Ace lands.
+        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Hearts, Rank::Ace)]);
+        let c = card(Suit::Spades, Rank::Two);
+        assert!(!can_place_on_foundation(&c, &p));
     }
 
     #[test]
     fn foundation_skipping_rank_is_invalid() {
         let c = card(Suit::Diamonds, Rank::Three);
-        let p = pile_with(PileType::Foundation(Suit::Diamonds), vec![card(Suit::Diamonds, Rank::Ace)]);
-        assert!(!can_place_on_foundation(&c, &p, Suit::Diamonds));
+        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Diamonds, Rank::Ace)]);
+        assert!(!can_place_on_foundation(&c, &p));
     }
 
     // Tableau tests
@@ -125,16 +148,16 @@ mod tests {
     fn foundation_king_on_queen_completes_suit() {
         // The last card placed to complete a foundation is always King on Queen.
         let c = card(Suit::Spades, Rank::King);
-        let p = pile_with(PileType::Foundation(Suit::Spades), vec![card(Suit::Spades, Rank::Queen)]);
-        assert!(can_place_on_foundation(&c, &p, Suit::Spades));
+        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Spades, Rank::Queen)]);
+        assert!(can_place_on_foundation(&c, &p));
     }
 
     #[test]
     fn foundation_king_wrong_suit_is_invalid() {
-        // King of Hearts cannot go on a Spades foundation even if rank matches.
+        // King of Hearts cannot go on a Spades-claimed foundation even if rank matches.
         let c = card(Suit::Hearts, Rank::King);
-        let p = pile_with(PileType::Foundation(Suit::Spades), vec![card(Suit::Spades, Rank::Queen)]);
-        assert!(!can_place_on_foundation(&c, &p, Suit::Spades));
+        let p = pile_with(PileType::Foundation(0), vec![card(Suit::Spades, Rank::Queen)]);
+        assert!(!can_place_on_foundation(&c, &p));
     }
 
     #[test]
@@ -163,4 +186,26 @@ mod tests {
         let p = pile_with(PileType::Tableau(0), vec![top]);
         assert!(!can_place_on_tableau(&c, &p));
     }
+
+    #[test]
+    fn tableau_sequence_validation() {
+        // Single card is trivially a valid sequence.
+        assert!(is_valid_tableau_sequence(&[card(Suit::Hearts, Rank::Five)]));
+        // Valid descending alternating-colour run K♠ Q♥ J♣.
+        assert!(is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Hearts, Rank::Queen),
+            card(Suit::Clubs, Rank::Jack),
+        ]));
+        // Same colour twice (Q♠ on K♠) — invalid.
+        assert!(!is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Spades, Rank::Queen),
+        ]));
+        // Rank gap (K♠ → J♥) — invalid.
+        assert!(!is_valid_tableau_sequence(&[
+            card(Suit::Spades, Rank::King),
+            card(Suit::Hearts, Rank::Jack),
+        ]));
+    }
 }

solitaire_core/src/scoring.rs

@@ -33,12 +33,11 @@ pub fn compute_time_bonus(elapsed_seconds: u64) -> i32 {
 #[cfg(test)]
 mod tests {
     use super::*;
-    use crate::card::Suit;
 
     #[test]
     fn move_to_foundation_scores_ten() {
-        assert_eq!(score_move(&PileType::Waste, &PileType::Foundation(Suit::Hearts)), 10);
-        assert_eq!(score_move(&PileType::Tableau(0), &PileType::Foundation(Suit::Clubs)), 10);
+        assert_eq!(score_move(&PileType::Waste, &PileType::Foundation(2)), 10);
+        assert_eq!(score_move(&PileType::Tableau(0), &PileType::Foundation(0)), 10);
     }
 
     #[test]
@@ -74,7 +73,7 @@ mod tests {
     #[test]
     fn non_waste_to_tableau_scores_zero() {
         // Foundation → Tableau is impossible in practice but must score 0.
-        assert_eq!(score_move(&PileType::Foundation(Suit::Clubs), &PileType::Tableau(0)), 0);
+        assert_eq!(score_move(&PileType::Foundation(0), &PileType::Tableau(0)), 0);
         // Tableau → Tableau (restack) scores 0.
         assert_eq!(score_move(&PileType::Tableau(1), &PileType::Tableau(2)), 0);
     }

solitaire_data/src/challenge.rs

@@ -90,9 +90,4 @@ mod tests {
         seeds.dedup();
         assert_eq!(seeds.len(), len_before);
     }
-
-    #[test]
-    fn challenge_count_matches_seed_list_length() {
-        assert_eq!(challenge_count() as usize, CHALLENGE_SEEDS.len());
-    }
 }

solitaire_data/src/lib.rs

@@ -56,6 +56,15 @@ pub trait SyncProvider: Send + Sync {
     async fn delete_account(&self) -> Result<(), SyncError> {
         Ok(())
     }
+    /// Upload a winning replay to the backend. On success, returns the
+    /// shareable web URL the player can copy to their clipboard
+    /// (`<server>/replays/<id>`). Default returns `UnsupportedPlatform`
+    /// so backends without a server (e.g. `LocalOnlyProvider`) are
+    /// silently no-op'd by the engine's push-on-win system, matching
+    /// the same pattern `pull` / `push` follow.
+    async fn push_replay(&self, _replay: &crate::replay::Replay) -> Result<String, SyncError> {
+        Err(SyncError::UnsupportedPlatform)
+    }
 }
 
 /// Blanket impl so `Box<dyn SyncProvider + Send + Sync>` (returned by
@@ -92,6 +101,9 @@ impl SyncProvider for Box<dyn SyncProvider + Send + Sync> {
     async fn delete_account(&self) -> Result<(), SyncError> {
         (**self).delete_account().await
     }
+    async fn push_replay(&self, replay: &crate::replay::Replay) -> Result<String, SyncError> {
+        (**self).push_replay(replay).await
+    }
 }
 
 pub mod stats;
@@ -99,8 +111,11 @@ pub use stats::{StatsExt, StatsSnapshot};
 
 pub mod storage;
 pub use storage::{
-    cleanup_orphaned_tmp_files, delete_game_state_at, game_state_file_path, load_game_state_from,
-    load_stats, load_stats_from, save_game_state_to, save_stats, save_stats_to, stats_file_path,
+    cleanup_orphaned_tmp_files, delete_game_state_at, delete_time_attack_session_at,
+    game_state_file_path, load_game_state_from, load_stats, load_stats_from,
+    load_time_attack_session_from, load_time_attack_session_from_at, save_game_state_to,
+    save_stats, save_stats_to, save_time_attack_session_to, stats_file_path,
+    time_attack_session_path, time_attack_session_with_now, TimeAttackSession,
 };
 
 pub mod achievements;
@@ -126,7 +141,10 @@ pub use challenge::{challenge_count, challenge_seed_for, CHALLENGE_SEEDS};
 pub mod settings;
 pub use settings::{
     load_settings_from, save_settings_to, settings_file_path, AnimSpeed, Settings, SyncBackend,
-    Theme, WindowGeometry,
+    Theme, WindowGeometry, REPLAY_MOVE_INTERVAL_MAX_SECS, REPLAY_MOVE_INTERVAL_MIN_SECS,
+    REPLAY_MOVE_INTERVAL_STEP_SECS, SOLVER_DEAL_RETRY_CAP, TIME_BONUS_MULTIPLIER_MAX,
+    TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_STEP, TOOLTIP_DELAY_MAX_SECS,
+    TOOLTIP_DELAY_MIN_SECS, TOOLTIP_DELAY_STEP_SECS,
 };
 
 pub mod auth_tokens;
@@ -136,3 +154,12 @@ pub use auth_tokens::{
 
 pub mod sync_client;
 pub use sync_client::{provider_for_backend, LocalOnlyProvider, SolitaireServerClient};
+
+pub mod replay;
+#[allow(deprecated)]
+pub use replay::{latest_replay_path, load_latest_replay_from, save_latest_replay_to};
+pub use replay::{
+    append_replay_to_history, load_replay_history_from, migrate_legacy_latest_replay,
+    replay_history_path, save_replay_history_to, Replay, ReplayHistory, ReplayMove,
+    REPLAY_HISTORY_CAP, REPLAY_HISTORY_SCHEMA_VERSION, REPLAY_SCHEMA_VERSION,
+};

solitaire_data/src/progress.rs

@@ -162,21 +162,6 @@ mod tests {
 
     // --- Persistence ---
 
-    #[test]
-    fn round_trip_save_and_load() {
-        let path = tmp_path("round_trip");
-        let _ = fs::remove_file(&path);
-
-        let mut p = PlayerProgress::default();
-        p.add_xp(1234);
-        p.unlocked_card_backs.push(2);
-        save_progress_to(&path, &p).expect("save");
-        let loaded = load_progress_from(&path);
-        assert_eq!(loaded.total_xp, 1234);
-        assert_eq!(loaded.level, p.level);
-        assert!(loaded.unlocked_card_backs.contains(&2));
-    }
-
     #[test]
     fn load_from_missing_file_returns_default() {
         let path = tmp_path("missing_xyz");
@@ -298,4 +283,70 @@ mod tests {
         assert!(!recorded_again, "same-day completion must report no-op");
         assert_eq!(p.daily_challenge_streak, 1);
     }
+
+    // --- Daily challenge history & longest streak ---
+
+    #[test]
+    fn record_daily_completion_appends_to_history() {
+        // Recording a completion adds the date to history, preserving the
+        // pre-call length + 1, and the new entry is the chronological tail.
+        let mut p = PlayerProgress::default();
+        let prev_len = p.daily_challenge_history.len();
+        let today = NaiveDate::from_ymd_opt(2026, 5, 5).unwrap();
+        let recorded = p.record_daily_completion(today);
+        assert!(recorded);
+        assert_eq!(p.daily_challenge_history.len(), prev_len + 1);
+        assert_eq!(p.daily_challenge_history.last().copied(), Some(today));
+    }
+
+    #[test]
+    fn record_daily_completion_updates_longest_streak() {
+        // A streak of 4 must lift `daily_challenge_longest_streak` from 2 to 4
+        // (we seed the previous best at 2 and watch it get overtaken).
+        let mut p = PlayerProgress {
+            daily_challenge_longest_streak: 2,
+            ..Default::default()
+        };
+        let d = NaiveDate::from_ymd_opt(2026, 5, 1).unwrap();
+        p.record_daily_completion(d);
+        p.record_daily_completion(d + Duration::days(1));
+        p.record_daily_completion(d + Duration::days(2));
+        // 3rd consecutive day equals the previous best; longest should match.
+        assert_eq!(p.daily_challenge_streak, 3);
+        assert_eq!(p.daily_challenge_longest_streak, 3);
+        // 4th consecutive day overtakes the previous best.
+        p.record_daily_completion(d + Duration::days(3));
+        assert_eq!(p.daily_challenge_streak, 4);
+        assert_eq!(p.daily_challenge_longest_streak, 4);
+    }
+
+    #[test]
+    fn legacy_progress_without_history_deserializes_to_empty() {
+        // A progress.json file produced before the history fields existed
+        // must still round-trip through serde::from_slice without error,
+        // with the new fields landing on their `#[serde(default)]` values.
+        let path = tmp_path("legacy_no_history");
+        let _ = fs::remove_file(&path);
+        let legacy_json = br#"{
+            "total_xp": 1500,
+            "level": 3,
+            "daily_challenge_last_completed": null,
+            "daily_challenge_streak": 0,
+            "weekly_goal_progress": {},
+            "unlocked_card_backs": [0],
+            "unlocked_backgrounds": [0],
+            "last_modified": "2026-04-29T12:00:00Z"
+        }"#;
+        fs::write(&path, legacy_json).expect("write");
+        let p = load_progress_from(&path);
+        assert_eq!(p.total_xp, 1500);
+        assert!(
+            p.daily_challenge_history.is_empty(),
+            "legacy file lacking daily_challenge_history must default to empty"
+        );
+        assert_eq!(
+            p.daily_challenge_longest_streak, 0,
+            "legacy file lacking daily_challenge_longest_streak must default to 0"
+        );
+    }
 }

solitaire_data/src/replay.rs

@@ -0,0 +1,740 @@
+//! Win-game replay recording + storage.
+//!
+//! When a player wins, the engine freezes the in-memory recording into a
+//! [`Replay`] and persists it to `<data_dir>/solitaire_quest/latest_replay.json`
+//! via [`save_latest_replay_to`]. The Stats screen offers a "Watch replay"
+//! action that loads it via [`load_latest_replay_from`] so the player can
+//! revisit (or, in a future build, watch the engine re-execute) the path
+//! they took to victory.
+//!
+//! Schema versioning: bump [`REPLAY_SCHEMA_VERSION`] whenever the on-disk
+//! shape changes. [`load_latest_replay_from`] returns `None` when the file
+//! carries any other version so older replays are silently dropped instead
+//! of crashing the loader.
+//!
+//! The recording is intentionally minimal — only [`ReplayMove`] entries
+//! that successfully advanced the game. `Undo` is **not** recorded: a
+//! replay represents the canonical path the player ultimately took to win,
+//! so backed-out missteps simply do not appear in the move list. The
+//! starting deal is not stored either — the [`seed`](Replay::seed) +
+//! [`draw_mode`](Replay::draw_mode) + [`mode`](Replay::mode) are sufficient
+//! for `GameState::new_with_mode` to rebuild the identical layout.
+
+use std::fs;
+use std::io;
+use std::path::{Path, PathBuf};
+
+use chrono::NaiveDate;
+use serde::{Deserialize, Serialize};
+use solitaire_core::game_state::{DrawMode, GameMode};
+use solitaire_core::pile::PileType;
+
+const APP_DIR_NAME: &str = "solitaire_quest";
+const LATEST_REPLAY_FILE_NAME: &str = "latest_replay.json";
+const REPLAY_HISTORY_FILE_NAME: &str = "replays.json";
+
+/// Maximum number of recent winning replays the rolling history retains.
+///
+/// When [`append_replay_to_history`] pushes a fresh entry past this cap,
+/// the oldest entry is dropped so the file never grows unbounded. The
+/// player can revisit any of the last [`REPLAY_HISTORY_CAP`] wins from
+/// the Stats overlay's replay selector — older wins age out silently.
+pub const REPLAY_HISTORY_CAP: usize = 8;
+
+/// Save-file schema version for [`ReplayHistory`]. Bump when the on-disk
+/// shape of the wrapper changes incompatibly so [`load_replay_history_from`]
+/// returns `None` for older files (the player simply sees an empty
+/// history rather than a half-loaded broken one). Bumping
+/// [`REPLAY_SCHEMA_VERSION`] independently invalidates individual
+/// [`Replay`] payloads inside an otherwise-current history.
+///
+/// History:
+/// - v1 (current): initial release of the rolling history wrapper.
+pub const REPLAY_HISTORY_SCHEMA_VERSION: u32 = 1;
+
+/// Default value for [`ReplayHistory::schema_version`] when deserialising
+/// files that pre-date the field. Any value other than
+/// [`REPLAY_HISTORY_SCHEMA_VERSION`] causes [`load_replay_history_from`]
+/// to return `None`.
+fn history_schema_v0() -> u32 {
+    0
+}
+
+/// Save-file schema version for [`Replay`]. Increment when the on-disk
+/// representation changes incompatibly so [`load_latest_replay_from`] can
+/// reject older formats and the player simply has no replay rather than
+/// seeing a broken one.
+///
+/// History:
+/// - v1: initial release. `ReplayMove` had separate `Draw` and `Recycle`
+///   variants which carried the *outcome* of a stock interaction rather
+///   than the player's atomic input.
+/// - v2 (current): `Draw` + `Recycle` collapsed into a single `StockClick`
+///   variant. The engine resolves draw-vs-recycle deterministically from
+///   the current stock state, so the input alone is sufficient and the
+///   replay model now stores atomic player inputs end-to-end.
+pub const REPLAY_SCHEMA_VERSION: u32 = 2;
+
+/// Default value for [`Replay::schema_version`] when deserialising files
+/// that pre-date the field. Any value other than [`REPLAY_SCHEMA_VERSION`]
+/// causes [`load_latest_replay_from`] to return `None`.
+fn schema_v0() -> u32 {
+    0
+}
+
+/// One atomic player input recorded during a winning game, in the order
+/// it was applied to the live `GameState`.
+///
+/// `Undo` is intentionally absent — see the module-level docs.
+///
+/// The variants represent *inputs*, not outcomes. `StockClick` covers
+/// every player click on the stock pile; the engine then resolves
+/// draw-vs-recycle deterministically from the current state during both
+/// recording and playback, so the same input always produces the same
+/// effect on the same starting deal.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub enum ReplayMove {
+    /// A successful `move_cards(from, to, count)` call.
+    Move {
+        /// Source pile.
+        from: PileType,
+        /// Destination pile.
+        to: PileType,
+        /// Number of cards moved.
+        count: usize,
+    },
+    /// A click on the stock pile. Resolves to a draw when stock is
+    /// non-empty and to a waste→stock recycle when stock is empty.
+    StockClick,
+}
+
+/// A complete recording of a single winning game.
+///
+/// Replays are reconstructed by rebuilding a fresh
+/// `GameState::new_with_mode(seed, draw_mode, mode)` and applying the
+/// [`moves`](Self::moves) in order. The presentation fields
+/// ([`time_seconds`](Self::time_seconds), [`final_score`](Self::final_score),
+/// [`recorded_at`](Self::recorded_at)) drive the Stats UI caption such as
+/// "Replay (2:14 win on 2026-05-02)".
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct Replay {
+    /// Schema version. See [`REPLAY_SCHEMA_VERSION`].
+    #[serde(default = "schema_v0")]
+    pub schema_version: u32,
+    /// Seed used for the deal — replay rasterises the deck via
+    /// `GameState::new_with_mode(seed, draw_mode, mode)`.
+    pub seed: u64,
+    /// Draw mode the recorded game was played in.
+    pub draw_mode: DrawMode,
+    /// Game mode the recorded game was played in.
+    pub mode: GameMode,
+    /// Total wall-clock seconds the win took. Used for the Stats UI
+    /// "Replay (2:14 win on 2026-05-02)" caption.
+    pub time_seconds: u64,
+    /// Final score at the moment of the win.
+    pub final_score: i32,
+    /// ISO-8601 date the win was recorded.
+    pub recorded_at: NaiveDate,
+    /// Ordered move list. Each entry is what the player did, replayable
+    /// against a fresh `GameState` constructed from the seed.
+    pub moves: Vec<ReplayMove>,
+    /// Public share URL for this replay on the active sync backend, set
+    /// by `sync_plugin::poll_replay_upload_result` when the upload
+    /// task resolves. `None` when the player won on a local-only
+    /// backend, the upload failed, or the replay pre-dates v0.19.0
+    /// share-link persistence. `#[serde(default)]` keeps older
+    /// `replays.json` files loadable without bumping
+    /// [`REPLAY_SCHEMA_VERSION`].
+    #[serde(default)]
+    pub share_url: Option<String>,
+}
+
+impl Replay {
+    /// Construct a fresh replay with the current schema version. The
+    /// caller fills in the recorded fields; this is the canonical
+    /// constructor used by the engine on win.
+    pub fn new(
+        seed: u64,
+        draw_mode: DrawMode,
+        mode: GameMode,
+        time_seconds: u64,
+        final_score: i32,
+        recorded_at: NaiveDate,
+        moves: Vec<ReplayMove>,
+    ) -> Self {
+        Self {
+            schema_version: REPLAY_SCHEMA_VERSION,
+            seed,
+            draw_mode,
+            mode,
+            time_seconds,
+            final_score,
+            recorded_at,
+            moves,
+            share_url: None,
+        }
+    }
+}
+
+/// Rolling history of the player's most recent winning replays.
+///
+/// Stored as a single JSON file at
+/// `<data_dir>/solitaire_quest/replays.json` (see
+/// [`replay_history_path`]). Capped at [`REPLAY_HISTORY_CAP`] entries —
+/// when [`append_replay_to_history`] pushes past the cap, the oldest
+/// entry is dropped so the file never grows unbounded.
+///
+/// `replays[0]` is always the most recent win; the Stats overlay's
+/// replay selector defaults to that entry and surfaces the older
+/// entries behind a small chooser so the player can revisit a memorable
+/// game even after a more recent win.
+#[derive(Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
+pub struct ReplayHistory {
+    /// Schema version. See [`REPLAY_HISTORY_SCHEMA_VERSION`].
+    #[serde(default = "history_schema_v0")]
+    pub schema_version: u32,
+    /// Most recent first. Capped at [`REPLAY_HISTORY_CAP`] entries —
+    /// older entries drop off when the cap is hit.
+    pub replays: Vec<Replay>,
+}
+
+impl Default for ReplayHistory {
+    /// An empty history at the current schema version. Used by callers
+    /// that need a starting point before the first winning replay has
+    /// ever been recorded.
+    fn default() -> Self {
+        Self {
+            schema_version: REPLAY_HISTORY_SCHEMA_VERSION,
+            replays: Vec::new(),
+        }
+    }
+}
+
+impl ReplayHistory {
+    /// Returns the most recent replay (`replays[0]`), or `None` when the
+    /// history is empty. Convenience used by the Stats overlay's default
+    /// selector position.
+    pub fn most_recent(&self) -> Option<&Replay> {
+        self.replays.first()
+    }
+
+    /// Returns the number of replays currently retained.
+    pub fn len(&self) -> usize {
+        self.replays.len()
+    }
+
+    /// Returns `true` when no replays have been recorded yet.
+    pub fn is_empty(&self) -> bool {
+        self.replays.is_empty()
+    }
+}
+
+/// Returns the platform-specific path to `latest_replay.json`, or `None`
+/// if `dirs::data_dir()` is unavailable (e.g. minimal Linux containers).
+#[deprecated(
+    note = "single-slot replay storage replaced by the rolling history at \
+            replay_history_path(); kept for the one-shot legacy migration \
+            in migrate_legacy_latest_replay"
+)]
+pub fn latest_replay_path() -> Option<PathBuf> {
+    dirs::data_dir().map(|d| d.join(APP_DIR_NAME).join(LATEST_REPLAY_FILE_NAME))
+}
+
+/// Returns the platform-specific path to `replays.json`, the rolling
+/// history file, or `None` if `dirs::data_dir()` is unavailable (e.g.
+/// minimal Linux containers).
+pub fn replay_history_path() -> Option<PathBuf> {
+    dirs::data_dir().map(|d| d.join(APP_DIR_NAME).join(REPLAY_HISTORY_FILE_NAME))
+}
+
+/// Save a [`Replay`] atomically to `path` using the standard `.tmp` →
+/// rename contract that the rest of `storage.rs` uses.
+///
+/// Overwrites any existing replay — only the most recent winning replay
+/// is retained on disk.
+#[deprecated(
+    note = "single-slot replay storage replaced by the rolling history; \
+            use append_replay_to_history instead. Kept for the one-shot \
+            legacy migration."
+)]
+pub fn save_latest_replay_to(path: &Path, replay: &Replay) -> io::Result<()> {
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+    let json = serde_json::to_string_pretty(replay).map_err(io::Error::other)?;
+    let tmp = path.with_extension("json.tmp");
+    fs::write(&tmp, json.as_bytes())?;
+    fs::rename(&tmp, path)?;
+    Ok(())
+}
+
+/// Load a [`Replay`] from `path`, returning `None` when the file is
+/// missing, corrupt, or carries a [`schema_version`](Replay::schema_version)
+/// other than [`REPLAY_SCHEMA_VERSION`].
+///
+/// Schema-mismatch is treated as "no replay" so the player just sees the
+/// "No replay recorded yet" caption rather than a half-loaded broken
+/// replay. Bumping [`REPLAY_SCHEMA_VERSION`] therefore invalidates every
+/// older save without further migration code.
+#[deprecated(
+    note = "single-slot replay storage replaced by the rolling history; \
+            use load_replay_history_from instead. Kept for the one-shot \
+            legacy migration."
+)]
+pub fn load_latest_replay_from(path: &Path) -> Option<Replay> {
+    let data = fs::read(path).ok()?;
+    let replay: Replay = serde_json::from_slice(&data).ok()?;
+    if replay.schema_version != REPLAY_SCHEMA_VERSION {
+        return None;
+    }
+    Some(replay)
+}
+
+/// Save a [`ReplayHistory`] atomically to `path` using the standard
+/// `.tmp` → rename contract.
+///
+/// The on-disk encoding is pretty-printed JSON; the file is intended to
+/// be small (≤ [`REPLAY_HISTORY_CAP`] entries, each carrying a few
+/// hundred move records at most) so the readability tradeoff is fine.
+pub fn save_replay_history_to(path: &Path, history: &ReplayHistory) -> io::Result<()> {
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+    let json = serde_json::to_string_pretty(history).map_err(io::Error::other)?;
+    let tmp = path.with_extension("json.tmp");
+    fs::write(&tmp, json.as_bytes())?;
+    fs::rename(&tmp, path)?;
+    Ok(())
+}
+
+/// Load a [`ReplayHistory`] from `path`, returning `None` when the file
+/// is missing, corrupt, or carries a [`schema_version`](ReplayHistory::schema_version)
+/// other than [`REPLAY_HISTORY_SCHEMA_VERSION`].
+///
+/// Individual [`Replay`] entries inside an otherwise-current history are
+/// filtered to only those carrying [`REPLAY_SCHEMA_VERSION`] — older
+/// entries are silently dropped so a future bump of the inner replay
+/// schema does not corrupt the wrapper.
+pub fn load_replay_history_from(path: &Path) -> Option<ReplayHistory> {
+    let data = fs::read(path).ok()?;
+    let history: ReplayHistory = serde_json::from_slice(&data).ok()?;
+    if history.schema_version != REPLAY_HISTORY_SCHEMA_VERSION {
+        return None;
+    }
+    let filtered: Vec<Replay> = history
+        .replays
+        .into_iter()
+        .filter(|r| r.schema_version == REPLAY_SCHEMA_VERSION)
+        .collect();
+    Some(ReplayHistory {
+        schema_version: REPLAY_HISTORY_SCHEMA_VERSION,
+        replays: filtered,
+    })
+}
+
+/// Append `replay` to the front of the rolling history at `path`,
+/// dropping the oldest entry once [`REPLAY_HISTORY_CAP`] is exceeded,
+/// and persist the updated history atomically.
+///
+/// If `path` has no existing history (missing file, corrupt, or
+/// schema-mismatched) a fresh [`ReplayHistory::default`] is used as the
+/// starting point so the new replay is always saved. The returned
+/// [`ReplayHistory`] is the exact value written to disk so callers can
+/// update an in-memory mirror (e.g. the Stats overlay's
+/// `ReplayHistoryResource`) without a follow-up `load`.
+pub fn append_replay_to_history(
+    path: &Path,
+    replay: Replay,
+) -> io::Result<ReplayHistory> {
+    let mut history = load_replay_history_from(path).unwrap_or_default();
+    // Most recent first. Reserve the front slot; pop the oldest if we
+    // exceed the cap so the file never grows unbounded.
+    history.replays.insert(0, replay);
+    if history.replays.len() > REPLAY_HISTORY_CAP {
+        history.replays.truncate(REPLAY_HISTORY_CAP);
+    }
+    save_replay_history_to(path, &history)?;
+    Ok(history)
+}
+
+/// One-shot migration from the legacy single-slot
+/// `latest_replay.json` file to the rolling [`ReplayHistory`] stored at
+/// `history_path`.
+///
+/// Behaviour matrix:
+/// - `history_path` already exists  → no-op (the rolling history wins).
+/// - `history_path` is absent and `latest_path` is absent → no-op.
+/// - `history_path` is absent and `latest_path` exists with a valid
+///   replay → seed a fresh history with that one replay and write it.
+/// - `history_path` is absent and `latest_path` exists but is corrupt /
+///   schema-mismatched → write an empty history (we know the player is
+///   on the new build and shouldn't keep being prompted to migrate).
+///
+/// The legacy `latest_replay.json` file is intentionally NOT deleted by
+/// this helper — keep it for one release as a safety net so a player
+/// rolling back to the previous build doesn't lose their last winning
+/// replay. The deletion is planned for the release after this one.
+pub fn migrate_legacy_latest_replay(latest_path: &Path, history_path: &Path) {
+    if history_path.exists() {
+        // Rolling history is authoritative once it exists.
+        return;
+    }
+    if !latest_path.exists() {
+        return;
+    }
+    // Use the deprecated loader directly — the migration is the one
+    // place we still consult the legacy file shape on purpose.
+    #[allow(deprecated)]
+    let legacy = load_latest_replay_from(latest_path);
+    let history = match legacy {
+        Some(replay) => ReplayHistory {
+            schema_version: REPLAY_HISTORY_SCHEMA_VERSION,
+            replays: vec![replay],
+        },
+        None => ReplayHistory::default(),
+    };
+    if let Err(e) = save_replay_history_to(history_path, &history) {
+        // Migration failure is non-fatal: on the next launch we'll just
+        // try again. We log to stderr rather than panic so headless
+        // tests stay quiet.
+        eprintln!(
+            "replay: failed to migrate legacy latest_replay.json into rolling history: {e}",
+        );
+    }
+}
+
+#[cfg(test)]
+// The legacy single-slot tests still exercise `save_latest_replay_to` /
+// `load_latest_replay_from` on purpose — they're the round-trip
+// guardrails for the migration source format.
+#[allow(deprecated)]
+mod tests {
+    use super::*;
+    use std::env;
+
+    fn tmp_path(name: &str) -> PathBuf {
+        env::temp_dir().join(format!("solitaire_test_replay_{name}.json"))
+    }
+
+    fn sample_replay() -> Replay {
+        let date = NaiveDate::from_ymd_opt(2026, 5, 2).expect("valid date");
+        Replay::new(
+            12345,
+            DrawMode::DrawThree,
+            GameMode::Classic,
+            134,
+            5_120,
+            date,
+            vec![
+                ReplayMove::StockClick,
+                ReplayMove::Move {
+                    from: PileType::Waste,
+                    to: PileType::Tableau(3),
+                    count: 1,
+                },
+                ReplayMove::StockClick,
+                ReplayMove::Move {
+                    from: PileType::Tableau(3),
+                    to: PileType::Foundation(0),
+                    count: 1,
+                },
+            ],
+        )
+    }
+
+    /// A non-trivial replay with mixed move kinds must round-trip
+    /// byte-identically through `save_latest_replay_to` /
+    /// `load_latest_replay_from`. Catches any future field that forgets
+    /// `Serialize`/`Deserialize` or breaks the on-disk format.
+    #[test]
+    fn replay_round_trips_through_save_and_load() {
+        let path = tmp_path("round_trip");
+        let _ = fs::remove_file(&path);
+
+        let replay = sample_replay();
+        save_latest_replay_to(&path, &replay).expect("save");
+
+        let loaded = load_latest_replay_from(&path).expect("load must succeed");
+        assert_eq!(loaded, replay, "round-trip must preserve every field");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// A file written by an older schema (or a pre-`schema_version`
+    /// build) must be rejected. We write a minimal v0 fixture and assert
+    /// that `load_latest_replay_from` returns `None` so the player gets
+    /// a clean "no replay" state instead of a broken one.
+    #[test]
+    fn replay_legacy_schema_version_falls_through_to_none() {
+        let path = tmp_path("legacy_schema");
+        let _ = fs::remove_file(&path);
+
+        // No `schema_version` key — defaults to 0 via `schema_v0()`. Even
+        // if the rest of the JSON parses cleanly, the version gate must
+        // reject it.
+        let v0_json = r#"{
+            "seed": 1,
+            "draw_mode": "DrawOne",
+            "mode": "Classic",
+            "time_seconds": 60,
+            "final_score": 100,
+            "recorded_at": "2025-01-01",
+            "moves": []
+        }"#;
+        fs::write(&path, v0_json).expect("write v0 fixture");
+
+        assert!(
+            load_latest_replay_from(&path).is_none(),
+            "v0 replay must be rejected (schema gate)",
+        );
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// Backwards-compat: a `Replay` record persisted before v0.19.0
+    /// share-link persistence carries no `share_url` field on disk.
+    /// `#[serde(default)]` must let it deserialise cleanly with
+    /// `share_url == None`, so existing players don't see their
+    /// rolling history wiped on the v0.19.0 update.
+    #[test]
+    fn replay_loads_when_share_url_field_is_absent() {
+        let pre_v019_json = format!(
+            r#"{{
+                "schema_version": {schema},
+                "seed": 1,
+                "draw_mode": "DrawOne",
+                "mode": "Classic",
+                "time_seconds": 60,
+                "final_score": 100,
+                "recorded_at": "2025-01-01",
+                "moves": []
+            }}"#,
+            schema = REPLAY_SCHEMA_VERSION,
+        );
+        let parsed: Replay = serde_json::from_str(&pre_v019_json)
+            .expect("pre-v0.19.0 replay JSON must still deserialise");
+        assert!(
+            parsed.share_url.is_none(),
+            "missing share_url field must default to None",
+        );
+    }
+
+    /// Atomic-write contract — `.tmp` must not be left behind after
+    /// `save_latest_replay_to` returns. Mirrors the same check that
+    /// guards `save_game_state_to` in `storage.rs`.
+    #[test]
+    fn replay_save_is_atomic() {
+        let path = tmp_path("atomic");
+        let _ = fs::remove_file(&path);
+
+        save_latest_replay_to(&path, &sample_replay()).expect("save");
+        let tmp = path.with_extension("json.tmp");
+        assert!(!tmp.exists(), ".tmp must be cleaned up after rename");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// Loading from a path that does not exist must return `None`, not
+    /// panic or surface an `Err`.
+    #[test]
+    fn replay_missing_file_returns_none() {
+        let path = tmp_path("missing_xyz");
+        let _ = fs::remove_file(&path);
+        assert!(load_latest_replay_from(&path).is_none());
+    }
+
+    /// Loading from a corrupt / partially-written file must return
+    /// `None`, not surface a deserialiser error to the engine.
+    #[test]
+    fn replay_corrupt_file_returns_none() {
+        let path = tmp_path("corrupt");
+        fs::write(&path, b"not valid json!!!").expect("write");
+        assert!(load_latest_replay_from(&path).is_none());
+        let _ = fs::remove_file(&path);
+    }
+
+    // -----------------------------------------------------------------------
+    // ReplayHistory — rolling list of recent wins
+    // -----------------------------------------------------------------------
+
+    /// Build a [`Replay`] whose `final_score` carries `id` so tests can
+    /// assert ordering / identity without writing a deep equality match.
+    fn replay_with_id(id: i32) -> Replay {
+        let date = NaiveDate::from_ymd_opt(2026, 5, 2).expect("valid date");
+        Replay::new(
+            id as u64,
+            DrawMode::DrawOne,
+            GameMode::Classic,
+            60,
+            id,
+            date,
+            vec![ReplayMove::StockClick],
+        )
+    }
+
+    /// Pushing past [`REPLAY_HISTORY_CAP`] must drop the oldest entries —
+    /// the on-disk file (and the in-memory mirror returned by the helper)
+    /// stays bounded so the user's data dir never grows unbounded.
+    #[test]
+    fn append_replay_to_history_caps_at_eight() {
+        let path = tmp_path("history_cap");
+        let _ = fs::remove_file(&path);
+
+        let mut last_returned = ReplayHistory::default();
+        for i in 0..10 {
+            last_returned = append_replay_to_history(&path, replay_with_id(i))
+                .expect("append must succeed");
+        }
+
+        assert_eq!(
+            last_returned.replays.len(),
+            REPLAY_HISTORY_CAP,
+            "history must be capped at REPLAY_HISTORY_CAP entries",
+        );
+        // The most recent ten pushes were ids 0..=9; ids 9, 8, ..., 2
+        // survive (newest first), ids 0 and 1 aged out.
+        let ids: Vec<i32> = last_returned.replays.iter().map(|r| r.final_score).collect();
+        assert_eq!(
+            ids,
+            vec![9, 8, 7, 6, 5, 4, 3, 2],
+            "newest entries must survive, oldest must age out",
+        );
+
+        // The on-disk file must agree with the returned in-memory copy.
+        let loaded = load_replay_history_from(&path).expect("load must succeed");
+        assert_eq!(loaded, last_returned, "disk must mirror returned history");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// `append_replay_to_history` must place new entries at index 0 so
+    /// the Stats overlay's default selector (most recent) lands on the
+    /// just-saved replay.
+    #[test]
+    fn append_replay_inserts_at_front() {
+        let path = tmp_path("history_front");
+        let _ = fs::remove_file(&path);
+
+        append_replay_to_history(&path, replay_with_id(1)).expect("append 1");
+        append_replay_to_history(&path, replay_with_id(2)).expect("append 2");
+        let history = append_replay_to_history(&path, replay_with_id(3)).expect("append 3");
+
+        let ids: Vec<i32> = history.replays.iter().map(|r| r.final_score).collect();
+        assert_eq!(
+            ids,
+            vec![3, 2, 1],
+            "history must be reverse-chronological (newest first)",
+        );
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// On first launch with the new code, a pre-existing
+    /// `latest_replay.json` must seed the new rolling history so the
+    /// player doesn't lose their last winning replay across the upgrade.
+    #[test]
+    fn legacy_latest_replay_migrates_to_history_on_first_launch() {
+        let latest = tmp_path("legacy_migrate_latest");
+        let history = tmp_path("legacy_migrate_history");
+        let _ = fs::remove_file(&latest);
+        let _ = fs::remove_file(&history);
+
+        // Seed the legacy file with a real replay.
+        let legacy_replay = sample_replay();
+        save_latest_replay_to(&latest, &legacy_replay).expect("seed legacy");
+        assert!(!history.exists(), "history file must not exist pre-migration");
+
+        migrate_legacy_latest_replay(&latest, &history);
+
+        assert!(history.exists(), "migration must create the history file");
+        let loaded = load_replay_history_from(&history)
+            .expect("post-migration history must load");
+        assert_eq!(loaded.replays.len(), 1, "history must hold exactly the legacy entry");
+        assert_eq!(loaded.replays[0], legacy_replay, "entry must equal the legacy replay");
+        // Legacy file is intentionally retained for one release as a
+        // safety net — see `migrate_legacy_latest_replay` doc comment.
+        assert!(latest.exists(), "legacy file must NOT be deleted by migration");
+
+        let _ = fs::remove_file(&latest);
+        let _ = fs::remove_file(&history);
+    }
+
+    /// When the rolling history file already exists, the migration must
+    /// be a no-op — we never want to overwrite the player's accumulated
+    /// history with a stale single-slot legacy entry.
+    #[test]
+    fn migrate_is_noop_when_history_already_exists() {
+        let latest = tmp_path("legacy_noop_latest");
+        let history = tmp_path("legacy_noop_history");
+        let _ = fs::remove_file(&latest);
+        let _ = fs::remove_file(&history);
+
+        save_latest_replay_to(&latest, &sample_replay()).expect("seed legacy");
+        let pre_existing = ReplayHistory {
+            schema_version: REPLAY_HISTORY_SCHEMA_VERSION,
+            replays: vec![replay_with_id(42)],
+        };
+        save_replay_history_to(&history, &pre_existing).expect("seed history");
+
+        migrate_legacy_latest_replay(&latest, &history);
+
+        let loaded = load_replay_history_from(&history).expect("load");
+        assert_eq!(loaded, pre_existing, "existing history must not be overwritten");
+
+        let _ = fs::remove_file(&latest);
+        let _ = fs::remove_file(&history);
+    }
+
+    /// A populated [`ReplayHistory`] must round-trip byte-identically
+    /// through `save_replay_history_to` / `load_replay_history_from`.
+    #[test]
+    fn replay_history_round_trips_through_save_and_load() {
+        let path = tmp_path("history_round_trip");
+        let _ = fs::remove_file(&path);
+
+        let history = ReplayHistory {
+            schema_version: REPLAY_HISTORY_SCHEMA_VERSION,
+            replays: vec![replay_with_id(7), replay_with_id(3), sample_replay()],
+        };
+        save_replay_history_to(&path, &history).expect("save");
+        let loaded = load_replay_history_from(&path).expect("load");
+        assert_eq!(loaded, history, "round-trip must preserve every field");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// A file written by an older history schema must be rejected so the
+    /// player sees a clean empty history rather than a half-loaded one.
+    #[test]
+    fn replay_history_legacy_schema_version_falls_through_to_none() {
+        let path = tmp_path("history_legacy_schema");
+        let _ = fs::remove_file(&path);
+
+        // No `schema_version` key → defaults to 0 via `history_schema_v0()`.
+        let v0_json = r#"{
+            "replays": []
+        }"#;
+        fs::write(&path, v0_json).expect("write v0 fixture");
+
+        assert!(
+            load_replay_history_from(&path).is_none(),
+            "v0 history must be rejected (schema gate)",
+        );
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// Atomic-write contract for the rolling history — `.tmp` must not be
+    /// left behind after `save_replay_history_to` returns.
+    #[test]
+    fn replay_history_save_is_atomic() {
+        let path = tmp_path("history_atomic");
+        let _ = fs::remove_file(&path);
+
+        save_replay_history_to(&path, &ReplayHistory::default()).expect("save");
+        let tmp = path.with_extension("json.tmp");
+        assert!(!tmp.exists(), ".tmp must be cleaned up after rename");
+
+        let _ = fs::remove_file(&path);
+    }
+}

solitaire_data/src/settings.rs

@@ -124,6 +124,74 @@ pub struct Settings {
     /// `None` thanks to `#[serde(default)]`.
     #[serde(default)]
     pub window_geometry: Option<WindowGeometry>,
+    /// Identifier of the active card-art theme. Matches `meta.id` from
+    /// the theme's `theme.ron` manifest. `"default"` is the bundled
+    /// theme and is always present in the registry; user-supplied
+    /// themes register under their own ids when they're imported.
+    /// Older `settings.json` files default cleanly to `"default"` via
+    /// `#[serde(default = ...)]`.
+    #[serde(default = "default_theme_id")]
+    pub selected_theme_id: String,
+    /// Set to `true` once the achievement-onboarding info-toast has been
+    /// shown to the player after their very first win. Acts as a
+    /// one-shot teach: subsequent wins must not re-fire the cue. Older
+    /// `settings.json` files written before this field existed
+    /// deserialize cleanly to `false` thanks to `#[serde(default)]` —
+    /// players who already had wins recorded before this field was
+    /// introduced are guarded by the post-condition `games_won == 1`
+    /// checked by `achievement_plugin::fire_achievement_onboarding_toast`,
+    /// so the toast still does not fire for them.
+    #[serde(default)]
+    pub shown_achievement_onboarding: bool,
+    /// Hover delay (seconds) before a tooltip appears. Range
+    /// `[0.0, 1.5]`; default matches `MOTION_TOOLTIP_DELAY_SECS` (0.5 s).
+    /// `0.0` means tooltips fire on the very next tick after hover —
+    /// the "Instant" setting. Older `settings.json` files written before
+    /// this field existed deserialize cleanly to the default via
+    /// `#[serde(default = "default_tooltip_delay")]`.
+    #[serde(default = "default_tooltip_delay")]
+    pub tooltip_delay_secs: f32,
+    /// Multiplier applied to the post-game time-bonus score component
+    /// shown in the win-summary modal. Range
+    /// `[TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_MAX]`
+    /// (`0.0`–`2.0`); default `1.0` keeps the existing behaviour.
+    ///
+    /// **COSMETIC ONLY** — this multiplier changes what the player
+    /// sees in the win modal's score breakdown but does **not** affect
+    /// achievement unlock thresholds, lifetime score totals, or
+    /// leaderboard submissions, which all use the raw, unmultiplied
+    /// score values produced by `solitaire_core`. Older
+    /// `settings.json` files written before this field existed
+    /// deserialize cleanly to `1.0` via
+    /// `#[serde(default = "default_time_bonus_multiplier")]`.
+    #[serde(default = "default_time_bonus_multiplier")]
+    pub time_bonus_multiplier: f32,
+    /// When `true`, the engine rejects new-game deals the
+    /// [`solitaire_core::solver`] cannot prove winnable, retrying
+    /// fresh seeds up to [`SOLVER_DEAL_RETRY_CAP`] attempts before
+    /// giving up and using the last tried seed. Off by default —
+    /// the solver adds a few hundred milliseconds of latency on the
+    /// pathological deals that hit the budget cap, and not every
+    /// player wants to wait. Older `settings.json` files written
+    /// before this field existed deserialize cleanly to `false` via
+    /// `#[serde(default)]`.
+    ///
+    /// Scope: only random-seed Classic-mode deals are filtered.
+    /// Daily challenges, replays, and explicit-seed requests skip the
+    /// solver retry loop — see `solitaire_engine::handle_new_game`.
+    #[serde(default)]
+    pub winnable_deals_only: bool,
+    /// Per-move duration during replay playback, in seconds. Range
+    /// `[REPLAY_MOVE_INTERVAL_MIN_SECS, REPLAY_MOVE_INTERVAL_MAX_SECS]`;
+    /// default mirrors `solitaire_engine::replay_playback::REPLAY_MOVE_INTERVAL_SECS`
+    /// (0.45 s/move) so existing playback behaviour is unchanged for
+    /// players who never touch the slider. Smaller values scrub
+    /// faster through the recorded move list. Older `settings.json`
+    /// files written before this field existed deserialize cleanly to
+    /// the default via
+    /// `#[serde(default = "default_replay_move_interval_secs")]`.
+    #[serde(default = "default_replay_move_interval_secs")]
+    pub replay_move_interval_secs: f32,
 }
 
 fn default_draw_mode() -> DrawMode {
@@ -138,6 +206,87 @@ fn default_music_volume() -> f32 {
     0.5
 }
 
+fn default_theme_id() -> String {
+    "default".to_string()
+}
+
+/// Default tooltip-hover dwell delay in seconds. Mirrors
+/// `solitaire_engine::ui_theme::MOTION_TOOLTIP_DELAY_SECS` so legacy
+/// `settings.json` files load to the existing baseline. The constant
+/// lives in the engine crate (which the data crate cannot depend on),
+/// so the value is duplicated here — kept in sync by the
+/// `settings_tooltip_delay_default_is_existing_baseline` test in
+/// `solitaire_engine::settings_plugin`.
+fn default_tooltip_delay() -> f32 {
+    0.5
+}
+
+/// Lower bound of the player-tunable tooltip delay slider, in seconds.
+pub const TOOLTIP_DELAY_MIN_SECS: f32 = 0.0;
+
+/// Upper bound of the player-tunable tooltip delay slider, in seconds.
+pub const TOOLTIP_DELAY_MAX_SECS: f32 = 1.5;
+
+/// Increment applied by the tooltip-delay decrement / increment buttons.
+pub const TOOLTIP_DELAY_STEP_SECS: f32 = 0.1;
+
+/// Lower bound of the player-tunable time-bonus multiplier. `0.0`
+/// disables the time-bonus row entirely (renders as "Off" in the UI).
+pub const TIME_BONUS_MULTIPLIER_MIN: f32 = 0.0;
+
+/// Upper bound of the player-tunable time-bonus multiplier. `2.0`
+/// doubles the displayed time bonus.
+pub const TIME_BONUS_MULTIPLIER_MAX: f32 = 2.0;
+
+/// Increment applied by the time-bonus multiplier decrement /
+/// increment buttons.
+pub const TIME_BONUS_MULTIPLIER_STEP: f32 = 0.1;
+
+/// Default value for [`Settings::time_bonus_multiplier`]. `1.0` keeps
+/// the displayed time bonus identical to the raw value produced by
+/// `solitaire_core::scoring::compute_time_bonus`.
+fn default_time_bonus_multiplier() -> f32 {
+    1.0
+}
+
+/// Default per-move duration during replay playback, in seconds.
+/// Mirrors `solitaire_engine::replay_playback::REPLAY_MOVE_INTERVAL_SECS`
+/// so legacy `settings.json` files load to the existing baseline and
+/// playback feels identical for players who never touch the slider.
+/// The constant is duplicated across the data and engine crates
+/// because `solitaire_data` cannot depend on the engine crate — keep
+/// the two values in sync when adjusting either.
+fn default_replay_move_interval_secs() -> f32 {
+    0.45
+}
+
+/// Lower bound of the player-tunable replay-playback per-move interval,
+/// in seconds. Below this the cards barely register visually before
+/// the next move fires; the cap keeps the playback legible.
+pub const REPLAY_MOVE_INTERVAL_MIN_SECS: f32 = 0.10;
+
+/// Upper bound of the player-tunable replay-playback per-move interval,
+/// in seconds. One second per move is a comfortable upper limit for
+/// players who want to study a recorded game frame by frame.
+pub const REPLAY_MOVE_INTERVAL_MAX_SECS: f32 = 1.00;
+
+/// Increment applied by the replay-playback decrement / increment
+/// buttons. 0.05 s gives 19 stops between MIN and MAX — fine-grained
+/// enough to land on any "round" speed (0.10 s, 0.25 s, 0.45 s, etc.)
+/// without making the slider feel stuck on the same value.
+pub const REPLAY_MOVE_INTERVAL_STEP_SECS: f32 = 0.05;
+
+/// Maximum number of seed retries [`solitaire_engine::handle_new_game`]
+/// is willing to attempt before giving up and accepting the latest
+/// candidate seed when [`Settings::winnable_deals_only`] is on. If
+/// every retry comes back [`SolverResult::Unwinnable`] (which would
+/// be very unusual) we'd rather hand the player a possibly-unwinnable
+/// deal than spin forever on the main thread.
+///
+/// 50 attempts × ~50 ms median per solve = ~2.5 s worst-case stall —
+/// the upper bound on UI freeze when the toggle is on.
+pub const SOLVER_DEAL_RETRY_CAP: u32 = 50;
+
 impl Default for Settings {
     fn default() -> Self {
         Self {
@@ -152,17 +301,34 @@ impl Default for Settings {
             first_run_complete: false,
             color_blind_mode: false,
             window_geometry: None,
+            selected_theme_id: default_theme_id(),
+            shown_achievement_onboarding: false,
+            tooltip_delay_secs: default_tooltip_delay(),
+            time_bonus_multiplier: default_time_bonus_multiplier(),
+            winnable_deals_only: false,
+            replay_move_interval_secs: default_replay_move_interval_secs(),
         }
     }
 }
 
 impl Settings {
-    /// Clamps both `sfx_volume` and `music_volume` into `[0.0, 1.0]` after
-    /// deserialization or hand-editing of `settings.json`.
+    /// Clamps `sfx_volume`, `music_volume`, `tooltip_delay_secs`,
+    /// `time_bonus_multiplier`, and `replay_move_interval_secs` into
+    /// their respective ranges after deserialization or hand-editing of
+    /// `settings.json`.
     pub fn sanitized(self) -> Self {
         Self {
             sfx_volume: self.sfx_volume.clamp(0.0, 1.0),
             music_volume: self.music_volume.clamp(0.0, 1.0),
+            tooltip_delay_secs: self
+                .tooltip_delay_secs
+                .clamp(TOOLTIP_DELAY_MIN_SECS, TOOLTIP_DELAY_MAX_SECS),
+            time_bonus_multiplier: self
+                .time_bonus_multiplier
+                .clamp(TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_MAX),
+            replay_move_interval_secs: self
+                .replay_move_interval_secs
+                .clamp(REPLAY_MOVE_INTERVAL_MIN_SECS, REPLAY_MOVE_INTERVAL_MAX_SECS),
             ..self
         }
     }
@@ -178,6 +344,44 @@ impl Settings {
         self.music_volume = (self.music_volume + delta).clamp(0.0, 1.0);
         self.music_volume
     }
+
+    /// Adjust the tooltip-hover dwell delay by `delta` seconds, clamped
+    /// to `[TOOLTIP_DELAY_MIN_SECS, TOOLTIP_DELAY_MAX_SECS]`. Returns the
+    /// new value.
+    pub fn adjust_tooltip_delay(&mut self, delta: f32) -> f32 {
+        self.tooltip_delay_secs = (self.tooltip_delay_secs + delta)
+            .clamp(TOOLTIP_DELAY_MIN_SECS, TOOLTIP_DELAY_MAX_SECS);
+        self.tooltip_delay_secs
+    }
+
+    /// Adjust the time-bonus multiplier by `delta`, clamped to
+    /// `[TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_MAX]`. The
+    /// result is rounded to one decimal place so the readout stays
+    /// clean across repeated `±` clicks (avoids float drift like
+    /// `0.30000004`). Returns the new value.
+    pub fn adjust_time_bonus_multiplier(&mut self, delta: f32) -> f32 {
+        let raw = (self.time_bonus_multiplier + delta)
+            .clamp(TIME_BONUS_MULTIPLIER_MIN, TIME_BONUS_MULTIPLIER_MAX);
+        // Round to 1 decimal place — the slider step is 0.1, so this
+        // collapses any FP drift introduced by repeated additions.
+        self.time_bonus_multiplier = (raw * 10.0).round() / 10.0;
+        self.time_bonus_multiplier
+    }
+
+    /// Adjust the replay-playback per-move interval by `delta`
+    /// seconds, clamped to
+    /// `[REPLAY_MOVE_INTERVAL_MIN_SECS, REPLAY_MOVE_INTERVAL_MAX_SECS]`.
+    /// The result is rounded to two decimal places so the readout
+    /// stays clean across repeated `±` clicks at the 0.05 s step
+    /// (avoids float drift like `0.45000003`). Returns the new value.
+    pub fn adjust_replay_move_interval(&mut self, delta: f32) -> f32 {
+        let raw = (self.replay_move_interval_secs + delta)
+            .clamp(REPLAY_MOVE_INTERVAL_MIN_SECS, REPLAY_MOVE_INTERVAL_MAX_SECS);
+        // Round to 2 decimal places — the slider step is 0.05, so this
+        // collapses any FP drift introduced by repeated additions.
+        self.replay_move_interval_secs = (raw * 100.0).round() / 100.0;
+        self.replay_move_interval_secs
+    }
 }
 
 /// Returns the platform-specific path to `settings.json`, or `None` if
@@ -218,18 +422,6 @@ mod tests {
         env::temp_dir().join(format!("solitaire_settings_test_{name}.json"))
     }
 
-    #[test]
-    fn defaults_are_reasonable() {
-        let s = Settings::default();
-        assert!((s.sfx_volume - 0.8).abs() < 1e-6);
-        assert!((s.music_volume - 0.5).abs() < 1e-6);
-        assert!(!s.first_run_complete);
-        assert_eq!(s.draw_mode, DrawMode::DrawOne);
-        assert_eq!(s.animation_speed, AnimSpeed::Normal);
-        assert_eq!(s.theme, Theme::Green);
-        assert_eq!(s.sync_backend, SyncBackend::Local);
-    }
-
     #[test]
     fn adjust_sfx_volume_clamps() {
         let mut s = Settings { sfx_volume: 0.5, ..Default::default() };
@@ -262,71 +454,6 @@ mod tests {
         assert!(s.first_run_complete);
     }
 
-    #[test]
-    fn sanitized_clamps_music_volume() {
-        let s = Settings { music_volume: 2.0, ..Default::default() }.sanitized();
-        assert_eq!(s.music_volume, 1.0);
-
-        let s2 = Settings { music_volume: -0.5, ..Default::default() }.sanitized();
-        assert_eq!(s2.music_volume, 0.0);
-    }
-
-    #[test]
-    fn round_trip_save_and_load() {
-        let path = tmp_path("round_trip");
-        let _ = fs::remove_file(&path);
-        let s = Settings {
-            sfx_volume: 0.42,
-            first_run_complete: true,
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(loaded, s);
-    }
-
-    #[test]
-    fn round_trip_save_and_load_full_settings() {
-        let path = tmp_path("round_trip_full");
-        let _ = fs::remove_file(&path);
-        let s = Settings {
-            draw_mode: DrawMode::DrawThree,
-            sfx_volume: 0.3,
-            music_volume: 0.7,
-            animation_speed: AnimSpeed::Fast,
-            theme: Theme::Dark,
-            sync_backend: SyncBackend::SolitaireServer {
-                url: "https://example.com".to_string(),
-                username: "testuser".to_string(),
-            },
-            selected_card_back: 0,
-            selected_background: 0,
-            first_run_complete: true,
-            color_blind_mode: false,
-            window_geometry: None,
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(loaded, s);
-    }
-
-    #[test]
-    fn round_trip_preserves_non_default_cosmetic_selections() {
-        // selected_card_back and selected_background must survive save→load with
-        // non-zero values — zero is the default and not a meaningful regression check.
-        let path = tmp_path("cosmetic_selections");
-        let _ = fs::remove_file(&path);
-        let s = Settings {
-            selected_card_back: 3,
-            selected_background: 2,
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(loaded.selected_card_back, 3);
-        assert_eq!(loaded.selected_background, 2);
-    }
-
     #[test]
     fn load_from_missing_file_returns_default() {
         let path = tmp_path("missing_xyz");
@@ -344,152 +471,70 @@ mod tests {
     }
 
     #[test]
-    fn load_from_old_format_uses_defaults_for_new_fields() {
-        // Simulate a settings.json written by an older version that only had
-        // sfx_volume and first_run_complete.
-        let path = tmp_path("old_format");
-        fs::write(
-            &path,
-            br#"{ "sfx_volume": 0.6, "first_run_complete": true }"#,
-        )
-        .expect("write");
-        let s = load_settings_from(&path);
-        assert!((s.sfx_volume - 0.6).abs() < 1e-6);
-        assert!(s.first_run_complete);
-        // New fields should fall back to their defaults.
-        assert!((s.music_volume - 0.5).abs() < 1e-6);
-        assert_eq!(s.animation_speed, AnimSpeed::Normal);
-        assert_eq!(s.theme, Theme::Green);
-        assert_eq!(s.sync_backend, SyncBackend::Local);
-        assert_eq!(s.draw_mode, DrawMode::DrawOne);
-        assert_eq!(s.selected_card_back, 0, "cosmetic card-back must default to 0 on old format");
-        assert_eq!(s.selected_background, 0, "cosmetic background must default to 0 on old format");
-        assert!(!s.color_blind_mode, "color_blind_mode must default to false on old format");
+    fn adjust_tooltip_delay_clamps_to_range() {
+        let mut s = Settings { tooltip_delay_secs: 0.5, ..Default::default() };
+        // Step up to 0.6.
+        assert!((s.adjust_tooltip_delay(0.1) - 0.6).abs() < 1e-6);
+        // Big positive jump clamps to TOOLTIP_DELAY_MAX_SECS.
+        assert!((s.adjust_tooltip_delay(5.0) - TOOLTIP_DELAY_MAX_SECS).abs() < 1e-6);
+        // Big negative jump clamps to TOOLTIP_DELAY_MIN_SECS.
+        assert!((s.adjust_tooltip_delay(-99.0) - TOOLTIP_DELAY_MIN_SECS).abs() < 1e-6);
+        // Confirm the floor is exactly zero.
+        assert_eq!(s.tooltip_delay_secs, 0.0);
     }
 
     #[test]
-    fn color_blind_mode_defaults_to_false_when_field_absent() {
-        // Simulate a JSON file that has no color_blind_mode field.
-        let json = br#"{ "sfx_volume": 0.7 }"#;
-        let s: Settings = serde_json::from_slice(json).unwrap_or_default();
-        assert!(!s.color_blind_mode, "color_blind_mode must be false when absent from JSON");
-    }
-
-    #[test]
-    fn color_blind_mode_round_trips() {
-        let path = tmp_path("color_blind");
-        let _ = std::fs::remove_file(&path);
-        let s = Settings {
-            color_blind_mode: true,
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert!(loaded.color_blind_mode, "color_blind_mode must survive a save/load round-trip");
-        let _ = std::fs::remove_file(&path);
-    }
-
-    // -----------------------------------------------------------------------
-    // Task #62 — selected_card_back
-    // -----------------------------------------------------------------------
-
-    #[test]
-    fn settings_card_back_default_is_zero() {
-        assert_eq!(Settings::default().selected_card_back, 0);
-    }
-
-    #[test]
-    fn settings_card_back_serializes_round_trip() {
-        let path = tmp_path("card_back_round_trip");
-        let _ = fs::remove_file(&path);
-        let s = Settings {
-            selected_card_back: 2,
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(loaded.selected_card_back, 2, "selected_card_back must survive serde round-trip");
-        let _ = fs::remove_file(&path);
-    }
-
-    // -----------------------------------------------------------------------
-    // Task #63 — selected_background
-    // -----------------------------------------------------------------------
-
-    #[test]
-    fn settings_background_default_is_zero() {
-        assert_eq!(Settings::default().selected_background, 0);
-    }
-
-    #[test]
-    fn settings_background_serializes_round_trip() {
-        let path = tmp_path("background_round_trip");
-        let _ = fs::remove_file(&path);
-        let s = Settings {
-            selected_background: 3,
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(loaded.selected_background, 3, "selected_background must survive serde round-trip");
-        let _ = fs::remove_file(&path);
-    }
-
-    // -----------------------------------------------------------------------
-    // window_geometry — persisted window size/position
-    // -----------------------------------------------------------------------
-
-    #[test]
-    fn settings_window_geometry_default_is_none() {
+    fn adjust_time_bonus_multiplier_clamps_and_rounds() {
+        let mut s = Settings { time_bonus_multiplier: 1.0, ..Default::default() };
+        // Step up to 1.1.
+        assert!((s.adjust_time_bonus_multiplier(0.1) - 1.1).abs() < 1e-6);
+        // Big positive jump clamps to TIME_BONUS_MULTIPLIER_MAX.
         assert!(
-            Settings::default().window_geometry.is_none(),
-            "default window_geometry must be None so first launch uses platform defaults"
+            (s.adjust_time_bonus_multiplier(99.0) - TIME_BONUS_MULTIPLIER_MAX).abs() < 1e-6
         );
-    }
-
-    #[test]
-    fn settings_with_window_geometry_round_trip() {
-        let path = tmp_path("window_geometry_round_trip");
-        let _ = fs::remove_file(&path);
-        let geom = WindowGeometry {
-            width: 1440,
-            height: 900,
-            x: 120,
-            y: 80,
-        };
-        let s = Settings {
-            window_geometry: Some(geom),
-            ..Settings::default()
-        };
-        save_settings_to(&path, &s).expect("save");
-        let loaded = load_settings_from(&path);
-        assert_eq!(
-            loaded.window_geometry,
-            Some(geom),
-            "window_geometry must survive serde round-trip"
-        );
-        let _ = fs::remove_file(&path);
-    }
-
-    #[test]
-    fn legacy_settings_without_window_geometry_deserializes_to_none() {
-        // A settings.json written by an older version of the game will be
-        // missing this field entirely. `#[serde(default)]` on the field
-        // must yield `None` rather than failing the whole deserialise.
-        let json = br#"{ "sfx_volume": 0.7, "first_run_complete": true }"#;
-        let s: Settings = serde_json::from_slice(json).unwrap_or_default();
+        // Big negative jump clamps to TIME_BONUS_MULTIPLIER_MIN.
         assert!(
-            s.window_geometry.is_none(),
-            "legacy settings.json missing window_geometry must deserialize to None"
+            (s.adjust_time_bonus_multiplier(-99.0) - TIME_BONUS_MULTIPLIER_MIN).abs() < 1e-6
+        );
+        assert_eq!(s.time_bonus_multiplier, 0.0);
+
+        // Repeated incremental adds must not drift past the 0.1 grid.
+        let mut s2 = Settings { time_bonus_multiplier: 0.0, ..Default::default() };
+        for _ in 0..10 {
+            s2.adjust_time_bonus_multiplier(0.1);
+        }
+        // After ten +0.1 steps, value should be exactly 1.0 (1 decimal).
+        assert!(
+            (s2.time_bonus_multiplier - 1.0).abs() < 1e-6,
+            "rounding should pin repeated 0.1 steps to the decimal grid, got {}",
+            s2.time_bonus_multiplier
         );
     }
 
     #[test]
-    fn window_geometry_explicit_null_deserializes_to_none() {
-        // An explicit `"window_geometry": null` is also valid input that
-        // must yield None — keeps tooling that hand-edits the file safe.
-        let json = br#"{ "window_geometry": null }"#;
-        let s: Settings = serde_json::from_slice(json).unwrap_or_default();
-        assert!(s.window_geometry.is_none());
+    fn adjust_replay_move_interval_clamps_and_rounds() {
+        let mut s = Settings { replay_move_interval_secs: 0.45, ..Default::default() };
+        // Step down to 0.40.
+        assert!((s.adjust_replay_move_interval(-0.05) - 0.40).abs() < 1e-6);
+        // Big positive jump clamps to MAX.
+        assert!(
+            (s.adjust_replay_move_interval(99.0) - REPLAY_MOVE_INTERVAL_MAX_SECS).abs() < 1e-6
+        );
+        // Big negative jump clamps to MIN.
+        assert!(
+            (s.adjust_replay_move_interval(-99.0) - REPLAY_MOVE_INTERVAL_MIN_SECS).abs() < 1e-6
+        );
+
+        // Repeated 0.05 steps must not drift past the 0.05 grid.
+        let mut s2 = Settings { replay_move_interval_secs: 0.10, ..Default::default() };
+        for _ in 0..6 {
+            s2.adjust_replay_move_interval(0.05);
+        }
+        // After six +0.05 steps from 0.10, value should be exactly 0.40 (2 decimals).
+        assert!(
+            (s2.replay_move_interval_secs - 0.40).abs() < 1e-6,
+            "rounding should pin repeated 0.05 steps to the decimal grid, got {}",
+            s2.replay_move_interval_secs
+        );
     }
 }

solitaire_data/src/stats.rs

@@ -5,16 +5,35 @@
 //! `update_on_win` method that depends on [`DrawMode`] from `solitaire_core`.
 
 use chrono::Utc;
-use solitaire_core::game_state::DrawMode;
+use solitaire_core::game_state::{DrawMode, GameMode};
 
 pub use solitaire_sync::StatsSnapshot;
 
 /// Extension trait providing game-logic mutation helpers for [`StatsSnapshot`].
 ///
-/// Import this trait alongside `StatsSnapshot` to use `update_on_win`.
+/// Import this trait alongside `StatsSnapshot` to use `update_on_win`
+/// and [`StatsExt::update_per_mode_bests`].
 pub trait StatsExt {
     /// Updates rolling statistics from a completed game win. Call once per `GameWonEvent`.
+    ///
+    /// Tracks lifetime totals only — per-mode best scores and times are
+    /// updated separately via [`StatsExt::update_per_mode_bests`] so the
+    /// long-standing call sites that only know about [`DrawMode`] keep
+    /// compiling.
     fn update_on_win(&mut self, score: i32, time_seconds: u64, draw_mode: &DrawMode);
+
+    /// Updates the per-mode best score and fastest-win-time fields for the
+    /// given [`GameMode`]. Call alongside [`StatsExt::update_on_win`] from
+    /// the win handler.
+    ///
+    /// Behaviour:
+    /// - `Classic`, `Zen`, `Challenge`: updates the matching `*_best_score`
+    ///   (max) and `*_fastest_win_seconds` (zero-aware min — 0 means
+    ///   "no win recorded yet").
+    /// - `TimeAttack`: no-op. Time Attack uses session-level scoring (count
+    ///   of wins in 10 minutes); a per-game best wouldn't compose with
+    ///   the other modes' single-game scoring.
+    fn update_per_mode_bests(&mut self, score: i32, time_seconds: u64, mode: GameMode);
 }
 
 impl StatsExt for StatsSnapshot {
@@ -51,6 +70,43 @@ impl StatsExt for StatsSnapshot {
 
         self.last_modified = Utc::now();
     }
+
+    fn update_per_mode_bests(&mut self, score: i32, time_seconds: u64, mode: GameMode) {
+        let score_u32 = score.max(0) as u32;
+        // Zero-aware min — 0 means "no win recorded yet" for the per-mode
+        // fastest fields, so we must not let a real time get clobbered to 0.
+        // (Mirrors the merge logic in `solitaire_sync::merge`.)
+        let min_ignore_zero = |existing: u64, candidate: u64| -> u64 {
+            if existing == 0 {
+                candidate
+            } else if candidate == 0 {
+                existing
+            } else {
+                existing.min(candidate)
+            }
+        };
+        match mode {
+            GameMode::Classic => {
+                self.classic_best_score = self.classic_best_score.max(score_u32);
+                self.classic_fastest_win_seconds =
+                    min_ignore_zero(self.classic_fastest_win_seconds, time_seconds);
+            }
+            GameMode::Zen => {
+                self.zen_best_score = self.zen_best_score.max(score_u32);
+                self.zen_fastest_win_seconds =
+                    min_ignore_zero(self.zen_fastest_win_seconds, time_seconds);
+            }
+            GameMode::Challenge => {
+                self.challenge_best_score = self.challenge_best_score.max(score_u32);
+                self.challenge_fastest_win_seconds =
+                    min_ignore_zero(self.challenge_fastest_win_seconds, time_seconds);
+            }
+            // Time Attack uses its own session-level scoring; a per-game best
+            // wouldn't compose with the other modes' single-game numbers.
+            GameMode::TimeAttack => {}
+        }
+        self.last_modified = Utc::now();
+    }
 }
 
 #[cfg(test)]
@@ -177,4 +233,123 @@ mod tests {
         s.update_on_win(200, 60, &DrawMode::DrawOne);
         assert_eq!(s.lifetime_score, u64::MAX, "lifetime_score must saturate, not overflow");
     }
+
+    // -----------------------------------------------------------------------
+    // Per-mode bests
+    // -----------------------------------------------------------------------
+
+    #[test]
+    fn classic_win_updates_classic_best_score_only() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(1500, 200, GameMode::Classic);
+        assert_eq!(s.classic_best_score, 1500);
+        assert_eq!(s.classic_fastest_win_seconds, 200);
+        // Other modes untouched.
+        assert_eq!(s.zen_best_score, 0);
+        assert_eq!(s.zen_fastest_win_seconds, 0);
+        assert_eq!(s.challenge_best_score, 0);
+        assert_eq!(s.challenge_fastest_win_seconds, 0);
+    }
+
+    #[test]
+    fn zen_win_updates_zen_best_score_only() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(1800, 600, GameMode::Zen);
+        assert_eq!(s.zen_best_score, 1800);
+        assert_eq!(s.zen_fastest_win_seconds, 600);
+        assert_eq!(s.classic_best_score, 0);
+        assert_eq!(s.challenge_best_score, 0);
+    }
+
+    #[test]
+    fn challenge_win_updates_challenge_best_score_only() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(2400, 480, GameMode::Challenge);
+        assert_eq!(s.challenge_best_score, 2400);
+        assert_eq!(s.challenge_fastest_win_seconds, 480);
+        assert_eq!(s.classic_best_score, 0);
+        assert_eq!(s.zen_best_score, 0);
+    }
+
+    #[test]
+    fn time_attack_win_does_not_touch_per_mode_bests() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(9999, 1, GameMode::TimeAttack);
+        assert_eq!(s.classic_best_score, 0);
+        assert_eq!(s.zen_best_score, 0);
+        assert_eq!(s.challenge_best_score, 0);
+        assert_eq!(s.classic_fastest_win_seconds, 0);
+        assert_eq!(s.zen_fastest_win_seconds, 0);
+        assert_eq!(s.challenge_fastest_win_seconds, 0);
+    }
+
+    #[test]
+    fn per_mode_best_score_takes_max_across_calls() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(500, 200, GameMode::Classic);
+        s.update_per_mode_bests(200, 200, GameMode::Classic);
+        s.update_per_mode_bests(900, 200, GameMode::Classic);
+        assert_eq!(s.classic_best_score, 900);
+    }
+
+    #[test]
+    fn per_mode_fastest_uses_zero_aware_min() {
+        // First Classic win: 240s. Field starts at 0 (no win yet) — we
+        // must adopt 240, not stay at 0 like a naive `min` would.
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(100, 240, GameMode::Classic);
+        assert_eq!(s.classic_fastest_win_seconds, 240);
+        // Faster Classic win replaces it.
+        s.update_per_mode_bests(100, 120, GameMode::Classic);
+        assert_eq!(s.classic_fastest_win_seconds, 120);
+        // Slower Classic win does not.
+        s.update_per_mode_bests(100, 300, GameMode::Classic);
+        assert_eq!(s.classic_fastest_win_seconds, 120);
+    }
+
+    #[test]
+    fn negative_score_treated_as_zero_in_per_mode() {
+        let mut s = StatsSnapshot::default();
+        s.update_per_mode_bests(-50, 240, GameMode::Classic);
+        assert_eq!(s.classic_best_score, 0);
+        // Time still recorded — a win with a low score is still a win.
+        assert_eq!(s.classic_fastest_win_seconds, 240);
+    }
+
+    #[test]
+    fn legacy_stats_without_per_mode_fields_deserializes_to_zero() {
+        // A pre-per-mode `stats.json` must still deserialise cleanly:
+        // every new field falls back to 0 via `#[serde(default)]` so
+        // updating the binary never wipes the player's old stats file.
+        let legacy_json = r#"{
+            "games_played": 12,
+            "games_won": 5,
+            "games_lost": 7,
+            "win_streak_current": 1,
+            "win_streak_best": 3,
+            "avg_time_seconds": 240,
+            "fastest_win_seconds": 180,
+            "lifetime_score": 8500,
+            "best_single_score": 2200,
+            "draw_one_wins": 4,
+            "draw_three_wins": 1,
+            "last_modified": "2026-04-29T12:00:00Z"
+        }"#;
+
+        let s: StatsSnapshot = serde_json::from_str(legacy_json)
+            .expect("legacy payload must deserialise without per-mode fields");
+
+        // Pre-existing fields kept their values.
+        assert_eq!(s.games_played, 12);
+        assert_eq!(s.best_single_score, 2200);
+        assert_eq!(s.fastest_win_seconds, 180);
+
+        // Every new per-mode field defaulted to 0 ("no win yet").
+        assert_eq!(s.classic_best_score, 0);
+        assert_eq!(s.classic_fastest_win_seconds, 0);
+        assert_eq!(s.zen_best_score, 0);
+        assert_eq!(s.zen_fastest_win_seconds, 0);
+        assert_eq!(s.challenge_best_score, 0);
+        assert_eq!(s.challenge_fastest_win_seconds, 0);
+    }
 }

solitaire_data/src/storage.rs

@@ -6,14 +6,17 @@
 use std::fs;
 use std::io;
 use std::path::{Path, PathBuf};
+use std::time::{SystemTime, UNIX_EPOCH};
 
-use solitaire_core::game_state::GameState;
+use serde::{Deserialize, Serialize};
+use solitaire_core::game_state::{GameState, GAME_STATE_SCHEMA_VERSION};
 
 use crate::stats::StatsSnapshot;
 
 const APP_DIR_NAME: &str = "solitaire_quest";
 const STATS_FILE_NAME: &str = "stats.json";
 const GAME_STATE_FILE_NAME: &str = "game_state.json";
+const TIME_ATTACK_SESSION_FILE_NAME: &str = "time_attack_session.json";
 
 /// Returns the platform-specific path to `stats.json`, or `None` if
 /// `dirs::data_dir()` is unavailable (e.g. minimal Linux containers).
@@ -72,10 +75,21 @@ pub fn game_state_file_path() -> Option<PathBuf> {
 }
 
 /// Load an in-progress `GameState` from `path`. Returns `None` if the file is
-/// missing, corrupt, or represents a finished game.
+/// missing, corrupt, represents a finished game, or carries a save-schema
+/// version other than [`GAME_STATE_SCHEMA_VERSION`].
+///
+/// Schema mismatch is treated as "no save" so a player upgrading across an
+/// incompatible game-state format change starts fresh instead of seeing a
+/// half-loaded game (or a deserialiser error). v1 saves with the old
+/// `Foundation(Suit)` key shape will fail to parse outright; any v1 saves
+/// that happen to round-trip but report `schema_version: 1` are also rejected
+/// here.
 pub fn load_game_state_from(path: &Path) -> Option<GameState> {
     let data = fs::read(path).ok()?;
     let gs: GameState = serde_json::from_slice(&data).ok()?;
+    if gs.schema_version != GAME_STATE_SCHEMA_VERSION {
+        return None;
+    }
     if gs.is_won {
         None
     } else {
@@ -128,6 +142,131 @@ pub fn cleanup_orphaned_tmp_files() -> io::Result<()> {
     Ok(())
 }
 
+// ---------------------------------------------------------------------------
+// Time Attack session (mode-specific sibling of game_state.json)
+// ---------------------------------------------------------------------------
+//
+// `GameState` carries `mode: GameMode`, so an in-progress Zen / Challenge /
+// Classic / TimeAttack deal is already round-tripped through `game_state.json`
+// — closing the window mid-deal in any of those modes restores the deal on
+// next launch. Time Attack adds a 10-minute session window and a per-session
+// win counter that live OUTSIDE `GameState` (in `TimeAttackResource` on the
+// engine side), so they are NOT covered by the game-state save/load. This
+// sibling file persists just that extra session-level state.
+//
+// The Bevy plugin layer (`solitaire_engine::time_attack_plugin`) is the only
+// caller. The file lives next to `game_state.json` in the same data dir and
+// is written using the same `.tmp` → rename atomic-write contract that the
+// rest of `storage.rs` uses.
+
+/// Persisted state for an in-progress Time Attack session.
+///
+/// Fields mirror the live `TimeAttackResource` minus the `active` flag (the
+/// presence of the file *is* the active flag — a missing file means no
+/// session in progress).
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub struct TimeAttackSession {
+    /// Seconds remaining in the 10-minute window when the save was written.
+    pub remaining_secs: f32,
+    /// Wins accumulated during the session so far.
+    pub wins: u32,
+    /// Wall-clock instant the save was written, as unix seconds. Used at
+    /// load time to detect whether the session window expired in real
+    /// time while the app was closed and to decrement `remaining_secs`
+    /// by the real elapsed time so the resumed session reflects how
+    /// long the window has actually been running.
+    pub saved_at_unix_secs: u64,
+}
+
+/// Returns the platform-specific path to `time_attack_session.json`, or
+/// `None` if `dirs::data_dir()` is unavailable.
+pub fn time_attack_session_path() -> Option<PathBuf> {
+    dirs::data_dir().map(|d| d.join(APP_DIR_NAME).join(TIME_ATTACK_SESSION_FILE_NAME))
+}
+
+/// Save a Time Attack session atomically. Mirrors `save_game_state_to`'s
+/// `.tmp` → rename contract.
+pub fn save_time_attack_session_to(path: &Path, session: &TimeAttackSession) -> io::Result<()> {
+    if let Some(parent) = path.parent() {
+        fs::create_dir_all(parent)?;
+    }
+    let json = serde_json::to_string_pretty(session).map_err(io::Error::other)?;
+    let tmp = path.with_extension("json.tmp");
+    fs::write(&tmp, json.as_bytes())?;
+    fs::rename(&tmp, path)?;
+    Ok(())
+}
+
+/// Load a Time Attack session from `path`, decrementing `remaining_secs`
+/// by the wall-clock time elapsed between the save and now.
+///
+/// Returns `None` when:
+/// - the file is missing or unreadable,
+/// - the JSON is corrupt / malformed, or
+/// - the session window expired during the time the app was closed
+///   (`saved_at_unix_secs + remaining_secs <= now_unix_secs`).
+///
+/// The `now_unix_secs` parameter is injectable so unit tests can simulate
+/// arbitrary wall-clock gaps without touching the real system clock. The
+/// public companion [`load_time_attack_session_from`] resolves "now" from
+/// `SystemTime::now()`.
+pub fn load_time_attack_session_from_at(
+    path: &Path,
+    now_unix_secs: u64,
+) -> Option<TimeAttackSession> {
+    let data = fs::read(path).ok()?;
+    let session: TimeAttackSession = serde_json::from_slice(&data).ok()?;
+    // Compute wall-clock elapsed seconds since the save was written.
+    // Saturating subtraction guards against a clock that moved backwards
+    // (rare, but possible across NTP corrections or VM clock drift).
+    let elapsed = now_unix_secs.saturating_sub(session.saved_at_unix_secs);
+    let remaining = session.remaining_secs - elapsed as f32;
+    if remaining <= 0.0 {
+        return None;
+    }
+    Some(TimeAttackSession {
+        remaining_secs: remaining,
+        wins: session.wins,
+        saved_at_unix_secs: session.saved_at_unix_secs,
+    })
+}
+
+/// Load a Time Attack session from `path`, using `SystemTime::now()` as
+/// the reference for the wall-clock-elapsed adjustment.
+///
+/// See [`load_time_attack_session_from_at`] for the rules under which
+/// the call returns `None` (missing file, corrupt JSON, expired window).
+pub fn load_time_attack_session_from(path: &Path) -> Option<TimeAttackSession> {
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .map_or(0, |d| d.as_secs());
+    load_time_attack_session_from_at(path, now)
+}
+
+/// Delete the Time Attack session file (called on session end, on session
+/// start, or on game completion). Silently ignores `NotFound` errors.
+pub fn delete_time_attack_session_at(path: &Path) -> io::Result<()> {
+    match fs::remove_file(path) {
+        Ok(()) => Ok(()),
+        Err(e) if e.kind() == io::ErrorKind::NotFound => Ok(()),
+        Err(e) => Err(e),
+    }
+}
+
+/// Convenience helper for callers that want to stamp a session with the
+/// current wall-clock time. Equivalent to constructing the struct
+/// manually and setting `saved_at_unix_secs` to `SystemTime::now()`.
+pub fn time_attack_session_with_now(remaining_secs: f32, wins: u32) -> TimeAttackSession {
+    let now = SystemTime::now()
+        .duration_since(UNIX_EPOCH)
+        .map_or(0, |d| d.as_secs());
+    TimeAttackSession {
+        remaining_secs,
+        wins,
+        saved_at_unix_secs: now,
+    }
+}
+
 /// Inner helper: delete `*.json.tmp` entries inside `dir`.
 ///
 /// Per-file errors (already deleted, permission denied) are silently ignored.
@@ -331,4 +470,235 @@ mod tests {
         let tmp = path.with_extension("json.tmp");
         assert!(!tmp.exists(), ".tmp must be cleaned up after rename");
     }
+
+    /// Pre-v2 save files used `Foundation(Suit)` keys and either fail to
+    /// parse outright or surface a `schema_version: 1`. Either path must
+    /// produce `None` so the player launches into a fresh game.
+    ///
+    /// Sibling assertion: the stats round-trip path is unaffected — only
+    /// the game-state schema bumped.
+    #[test]
+    fn save_format_v1_is_rejected() {
+        let path = gs_path("schema_v1");
+        let _ = fs::remove_file(&path);
+
+        // A pared-down v1 JSON literal: foundation pile keys use the old
+        // suit-tagged form and the file omits `schema_version` (so it
+        // deserialises with the default of 1). Even if a future change
+        // makes `Foundation(Suit)` parse-compatible, the schema-version
+        // gate keeps this case rejected.
+        let v1_json = r#"{
+            "piles": [
+                [{"Foundation": "Hearts"}, {"pile_type": {"Foundation": "Hearts"}, "cards": []}]
+            ],
+            "draw_mode": "DrawOne",
+            "score": 0,
+            "move_count": 0,
+            "elapsed_seconds": 0,
+            "seed": 42,
+            "is_won": false,
+            "is_auto_completable": false,
+            "undo_count": 0,
+            "undo_stack": []
+        }"#;
+        fs::write(&path, v1_json).expect("write v1 fixture");
+
+        assert!(
+            load_game_state_from(&path).is_none(),
+            "v1 game_state.json must be rejected (parse failure or schema bump)",
+        );
+
+        // Sibling sanity: stats files are independent and still round-trip.
+        let stats_path = tmp_path("schema_unrelated_stats");
+        let _ = fs::remove_file(&stats_path);
+        save_stats_to(&stats_path, &StatsSnapshot::default()).expect("save stats");
+        let loaded = load_stats_from(&stats_path);
+        assert_eq!(loaded, StatsSnapshot::default());
+    }
+
+    // -----------------------------------------------------------------------
+    // Time Attack session persistence
+    //
+    // Documents the contract that closing the window mid-Time-Attack does
+    // NOT lose the 10-minute window or the running win count. Classic /
+    // Zen / Challenge are covered by `game_state.json` because their entire
+    // mid-deal state lives in `GameState.mode` + `GameState.piles`; Time
+    // Attack additionally needs the session timer + wins counter, both of
+    // which live in `TimeAttackResource` on the engine side and are NOT
+    // part of `GameState`. This sibling file persists exactly that.
+    // -----------------------------------------------------------------------
+
+    fn ta_path(name: &str) -> PathBuf {
+        env::temp_dir().join(format!("solitaire_test_ta_{name}.json"))
+    }
+
+    /// Round-trip a session that was saved "just now" (zero wall-clock
+    /// elapsed). All three persisted fields must come back unchanged.
+    #[test]
+    fn time_attack_session_round_trips_through_save_and_load() {
+        let path = ta_path("round_trip");
+        let _ = fs::remove_file(&path);
+
+        // Use a fixed unix timestamp so the load step (which receives the
+        // SAME timestamp as "now") sees zero wall-clock elapsed.
+        let saved_at: u64 = 1_800_000_000;
+        let session = TimeAttackSession {
+            remaining_secs: 240.0,
+            wins: 3,
+            saved_at_unix_secs: saved_at,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+
+        let loaded = load_time_attack_session_from_at(&path, saved_at)
+            .expect("session must load when not yet expired");
+        assert!(
+            (loaded.remaining_secs - 240.0).abs() < 0.01,
+            "remaining_secs must be unchanged when no wall-clock time has passed; got {}",
+            loaded.remaining_secs,
+        );
+        assert_eq!(loaded.wins, 3, "wins must round-trip");
+        assert_eq!(loaded.saved_at_unix_secs, saved_at, "timestamp must round-trip");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// A session whose window expired entirely between launches must be
+    /// discarded on load — the caller starts fresh rather than resuming a
+    /// dead session.
+    #[test]
+    fn time_attack_session_discarded_when_expired_between_launches() {
+        let path = ta_path("expired");
+        let _ = fs::remove_file(&path);
+
+        // Saved 20 minutes ago with 240 s remaining — long expired.
+        let saved_at: u64 = 1_800_000_000;
+        let session = TimeAttackSession {
+            remaining_secs: 240.0,
+            wins: 5,
+            saved_at_unix_secs: saved_at,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+
+        // 20 minutes (1200 s) later → 240 - 1200 = -960 s remaining.
+        let now = saved_at + 1200;
+        assert!(
+            load_time_attack_session_from_at(&path, now).is_none(),
+            "an expired session must return None so the player starts fresh",
+        );
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// The `remaining_secs` returned at load time must be the persisted
+    /// value minus the wall-clock seconds that elapsed while the app was
+    /// closed.
+    #[test]
+    fn time_attack_session_remaining_secs_decremented_by_real_elapsed() {
+        let path = ta_path("decremented");
+        let _ = fs::remove_file(&path);
+
+        let saved_at: u64 = 1_800_000_000;
+        let session = TimeAttackSession {
+            remaining_secs: 240.0,
+            wins: 2,
+            saved_at_unix_secs: saved_at,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+
+        // 60 s elapsed in real time → expect 180 s remaining.
+        let now = saved_at + 60;
+        let loaded = load_time_attack_session_from_at(&path, now)
+            .expect("session must still load — 180 s left");
+        assert!(
+            (loaded.remaining_secs - 180.0).abs() < 5.0,
+            "remaining_secs ≈ 180 ± 5 s after a 60 s wall-clock gap; got {}",
+            loaded.remaining_secs,
+        );
+        assert_eq!(loaded.wins, 2, "wins must survive the elapsed adjustment");
+
+        let _ = fs::remove_file(&path);
+    }
+
+    /// Atomic-write contract — `.tmp` must not be left behind after
+    /// `save_time_attack_session_to` returns.
+    #[test]
+    fn time_attack_session_save_is_atomic() {
+        let path = ta_path("atomic");
+        let session = TimeAttackSession {
+            remaining_secs: 100.0,
+            wins: 0,
+            saved_at_unix_secs: 1_800_000_000,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+        let tmp = path.with_extension("json.tmp");
+        assert!(!tmp.exists(), ".tmp must be cleaned up after rename");
+        let _ = fs::remove_file(&path);
+    }
+
+    /// Loading from a path that does not exist must return `None`, not
+    /// panic.
+    #[test]
+    fn time_attack_session_missing_file_returns_none() {
+        let path = ta_path("missing_xyz");
+        let _ = fs::remove_file(&path);
+        assert!(load_time_attack_session_from_at(&path, 0).is_none());
+    }
+
+    /// Loading from a corrupt / partially-written file must return `None`,
+    /// not surface a deserialiser error.
+    #[test]
+    fn time_attack_session_corrupt_file_returns_none() {
+        let path = ta_path("corrupt");
+        fs::write(&path, b"not valid json!!!").expect("write");
+        assert!(load_time_attack_session_from_at(&path, 0).is_none());
+        let _ = fs::remove_file(&path);
+    }
+
+    /// `delete_time_attack_session_at` removes the file when it exists
+    /// and returns `Ok(())` when it does not.
+    #[test]
+    fn time_attack_session_delete_handles_present_and_absent() {
+        let path = ta_path("delete");
+        let session = TimeAttackSession {
+            remaining_secs: 50.0,
+            wins: 0,
+            saved_at_unix_secs: 1_800_000_000,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+        assert!(path.exists());
+        delete_time_attack_session_at(&path).expect("delete");
+        assert!(!path.exists());
+        // Second delete on the now-absent file must succeed.
+        delete_time_attack_session_at(&path).expect("missing-file delete is ok");
+    }
+
+    /// A session whose `saved_at_unix_secs` is in the future (e.g. the
+    /// system clock moved backward across NTP correction) must NOT be
+    /// rejected as expired. Saturating subtraction must clamp the
+    /// "elapsed" value to zero.
+    #[test]
+    fn time_attack_session_handles_clock_running_backwards() {
+        let path = ta_path("clock_backwards");
+        let _ = fs::remove_file(&path);
+
+        let saved_at: u64 = 1_800_000_000;
+        let session = TimeAttackSession {
+            remaining_secs: 60.0,
+            wins: 1,
+            saved_at_unix_secs: saved_at,
+        };
+        save_time_attack_session_to(&path, &session).expect("save");
+
+        // "now" is BEFORE the saved time — should not crash, should not expire.
+        let now_in_past = saved_at - 100;
+        let loaded = load_time_attack_session_from_at(&path, now_in_past)
+            .expect("clock-backwards must not discard the session");
+        assert!(
+            (loaded.remaining_secs - 60.0).abs() < 0.01,
+            "remaining_secs must clamp elapsed to 0 when clock ran backwards; got {}",
+            loaded.remaining_secs,
+        );
+
+        let _ = fs::remove_file(&path);
+    }
 }

solitaire_data/src/sync_client.rs

@@ -16,6 +16,7 @@ use solitaire_sync::{ChallengeGoal, LeaderboardEntry, SyncPayload, SyncResponse}
 
 use crate::{
     auth_tokens::{load_access_token, load_refresh_token, store_tokens},
+    replay::Replay,
     settings::SyncBackend,
     SyncError, SyncProvider,
 };
@@ -356,6 +357,69 @@ impl SyncProvider for SolitaireServerClient {
 
         extract_leaderboard_body(resp).await
     }
+
+    /// Upload a winning replay to `POST /api/replays`. On success the
+    /// server returns `{ "id": "<uuid>" }`; this method composes that
+    /// id with the configured base URL into the player-shareable
+    /// `<base>/replays/<id>` link and returns it. Mirrors the `push`
+    /// auth flow: 401 triggers a token refresh and one retry.
+    async fn push_replay(&self, replay: &Replay) -> Result<String, SyncError> {
+        let token = self.access_token()?;
+        let url = format!("{}/api/replays", self.base_url);
+
+        let resp = self
+            .client
+            .post(&url)
+            .bearer_auth(&token)
+            .json(replay)
+            .send()
+            .await
+            .map_err(|e| SyncError::Network(e.to_string()))?;
+
+        if resp.status() == reqwest::StatusCode::UNAUTHORIZED {
+            self.refresh_token().await?;
+            let new_token = self.access_token()?;
+            let resp = self
+                .client
+                .post(&url)
+                .bearer_auth(new_token)
+                .json(replay)
+                .send()
+                .await
+                .map_err(|e| SyncError::Network(e.to_string()))?;
+            return self.share_url_from_response(resp).await;
+        }
+
+        self.share_url_from_response(resp).await
+    }
+}
+
+impl SolitaireServerClient {
+    /// Pulled out of `push_replay` so both the first attempt and the
+    /// post-401-retry attempt go through the same parse path.
+    async fn share_url_from_response(
+        &self,
+        resp: reqwest::Response,
+    ) -> Result<String, SyncError> {
+        let status = resp.status();
+        if !status.is_success() {
+            return Err(if status == reqwest::StatusCode::UNAUTHORIZED
+                || status == reqwest::StatusCode::FORBIDDEN
+            {
+                SyncError::Auth(format!("server returned {status}"))
+            } else {
+                SyncError::Network(format!("server returned {status}"))
+            });
+        }
+        let body: serde_json::Value = resp
+            .json()
+            .await
+            .map_err(|e| SyncError::Serialization(e.to_string()))?;
+        let id = body["id"].as_str().ok_or_else(|| {
+            SyncError::Serialization("upload response missing `id`".into())
+        })?;
+        Ok(format!("{}/replays/{}", self.base_url, id))
+    }
 }
 
 // ---------------------------------------------------------------------------

solitaire_engine/Cargo.toml

@@ -13,6 +13,16 @@ solitaire_sync = { workspace = true }
 chrono         = { workspace = true }
 uuid           = { workspace = true }
 tokio          = { workspace = true }
+serde          = { workspace = true }
+thiserror      = { workspace = true }
+usvg           = { workspace = true }
+resvg          = { workspace = true }
+tiny-skia      = { workspace = true }
+ron            = { workspace = true }
+dirs           = { workspace = true }
+zip            = { workspace = true }
+arboard        = { workspace = true }
 
 [dev-dependencies]
 async-trait = { workspace = true }
+tempfile    = { workspace = true }

solitaire_engine/assets/themes/default/PROVENANCE.md

@@ -0,0 +1,43 @@
+# Default theme — provenance
+
+This directory is the bundled-default card theme that ships embedded in
+the binary via Bevy's `embedded_asset!` macro (see
+`solitaire_engine/src/assets/sources.rs`). At runtime its files are
+addressable as `embedded://solitaire_engine/assets/themes/default/...`.
+
+## Current state (Phase 3)
+
+The `theme.ron` manifest in this directory lists all 52 face slots plus
+a back slot, but **the referenced SVG files do not yet exist**. The
+manifest is intentionally a stub so that:
+
+1. `embedded_asset!` has a real file to bundle (the manifest itself).
+2. `ThemeManifest::validate` accepts the manifest (it requires all 52
+   faces to be listed by name).
+3. The `embedded://` asset source can be source-registered and queried
+   without runtime errors during Phase 3.
+
+The actual SVG art will be added when the project swaps in the
+`hayeah/playing-cards-assets` artwork — see the implementation plan in
+`/CARD_PLAN.md`. At that point, every `.svg` filename listed in
+`theme.ron`'s `faces` map (and `back.svg`) must be added here, and each
+new file needs a corresponding `embedded_asset!(app, ...)` call in
+`solitaire_engine/src/assets/sources.rs::register_default_theme`.
+
+## How to add files to the bundled default theme
+
+For each new file you drop into this directory:
+
+1. Drop the file under `solitaire_engine/assets/themes/default/`.
+2. Add one line to `register_default_theme` in
+   `solitaire_engine/src/assets/sources.rs` of the form:
+   ```rust
+   embedded_asset!(app, "../../assets/themes/default/<filename>");
+   ```
+   (The path is relative to `sources.rs`, which lives in
+   `solitaire_engine/src/assets/`.)
+3. Update this file with the licence and origin of the new asset.
+
+## Licence
+
+To be filled in once real artwork lands.

solitaire_engine/assets/themes/default/back.svg

@@ -0,0 +1,40 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!--
+  Default theme card back — Solitaire Quest's midnight-purple palette.
+  Original work, MIT-licensed alongside the rest of this project.
+  Aspect 2:3 to match the face SVGs from hayeah/playing-cards-assets.
+-->
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 200 300" width="200" height="300">
+  <defs>
+    <pattern id="diamonds" x="0" y="0" width="20" height="20" patternUnits="userSpaceOnUse">
+      <rect x="0" y="0" width="20" height="20" fill="#1A0F2E"/>
+      <path d="M 10 0 L 20 10 L 10 20 L 0 10 Z"
+            fill="none" stroke="#3A2580" stroke-width="1"/>
+      <circle cx="10" cy="10" r="1" fill="#FFD23F"/>
+    </pattern>
+  </defs>
+
+  <!-- Outer card surface with a midnight-purple base + diamond lattice -->
+  <rect x="0" y="0" width="200" height="300" rx="12" ry="12" fill="#1A0F2E"/>
+  <rect x="6" y="6" width="188" height="288" rx="9" ry="9" fill="url(#diamonds)"/>
+
+  <!-- Bordered inset so the lattice has a clear edge -->
+  <rect x="14" y="14" width="172" height="272" rx="6" ry="6"
+        fill="none" stroke="#FFD23F" stroke-width="1.5" opacity="0.85"/>
+
+  <!-- Centred diamond medallion -->
+  <g transform="translate(100 150)">
+    <path d="M 0 -42 L 42 0 L 0 42 L -42 0 Z" fill="#2D1B69" stroke="#FFD23F" stroke-width="2"/>
+    <path d="M 0 -22 L 22 0 L 0 22 L -22 0 Z" fill="#3A2580" stroke="#FFD23F" stroke-width="1"/>
+    <circle cx="0" cy="0" r="4" fill="#FFD23F"/>
+  </g>
+
+  <!-- Corner pips picking up the magenta secondary accent so the back
+       still reads as part of the design system at a glance -->
+  <g fill="#FF6B9D">
+    <circle cx="22" cy="22" r="2.5"/>
+    <circle cx="178" cy="22" r="2.5"/>
+    <circle cx="22" cy="278" r="2.5"/>
+    <circle cx="178" cy="278" r="2.5"/>
+  </g>
+</svg>

solitaire_engine/assets/themes/default/clubs_10.svg

@@ -0,0 +1,281 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+
+<!-- http://code.google.com/p/vector-playing-cards/ -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:xlink="http://www.w3.org/1999/xlink"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="167.0869141pt"
+   height="242.6669922pt"
+   viewBox="0 0 167.0869141 242.6669922"
+   xml:space="preserve"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.48.0 r9654"
+   sodipodi:docname="10_of_clubs.svg"
+   inkscape:export-filename="/home/byron/art/cards/final/PNGs/10_of_clubs.png"
+   inkscape:export-xdpi="215.44792"
+   inkscape:export-ydpi="215.44792"><metadata
+   id="metadata43"><rdf:RDF><cc:Work
+       rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+         rdf:resource="http://purl.org/dc/dcmitype/StillImage" /><dc:title></dc:title></cc:Work></rdf:RDF></metadata><defs
+   id="defs41"><radialGradient
+     inkscape:collect="always"
+     xlink:href="#linearGradient2984"
+     id="radialGradient3760"
+     cx="48.231091"
+     cy="18.137882"
+     fx="48.231091"
+     fy="18.137882"
+     r="9.5"
+     gradientUnits="userSpaceOnUse"
+     gradientTransform="matrix(-1.5605256,0.01828294,-0.02684055,-2.2909528,123.98377,58.809108)" /><linearGradient
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+       style="stop-color:#000000;stop-opacity:1;"
+       offset="0"
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+     cx="171.48665"
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+     inkscape:collect="always" /><linearGradient
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+     fy="461.84113"
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+     inkscape:collect="always" /><linearGradient
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+   pagecolor="#ffffff"
+   bordercolor="#666666"
+   borderopacity="1"
+   objecttolerance="10"
+   gridtolerance="10"
+   guidetolerance="10"
+   inkscape:pageopacity="0"
+   inkscape:pageshadow="2"
+   inkscape:window-width="1680"
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+   inkscape:zoom="2.4336873"
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+   inkscape:cy="148.16686"
+   inkscape:window-x="0"
+   inkscape:window-y="25"
+   inkscape:window-maximized="1"
+   inkscape:current-layer="svg2" />
+	<g
+   id="Layer_x0020_1"
+   style="fill-rule:nonzero;clip-rule:nonzero;stroke:#000000;stroke-miterlimit:4;">
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