fix(replay): store the deal via upstream card_game serializers (schema v4)

Replays previously persisted only seed + moves and re-dealt the board
from the seed at playback time, so any change to the seed->deal mapping
(RNG bumps, upstream upgrades) silently invalidated every existing
replay. Schema v4 instead embeds a SessionRecording - the upstream
card_game Session serde ({config, initial_state, instructions}) - so
playback rebuilds the exact recorded board; seed/draw_mode/mode remain
caption metadata only.

- core: SessionRecording newtype delegating to Session<Klondike> serde;
  GameState::recording() / from_recording(); from_instructions_unchecked
  fixture helper; serde_json added to dev-deps (tests only)
- data: Replay v4 (recording replaces moves); v1-v3 files rejected by
  the existing version gate
- engine: win-recording and sync upload freeze game.recording();
  playback rebuilds from the recording; Playing carries the extracted
  move list (+ Box<Replay> for clippy large_enum_variant)
- wasm: replay_export() builds the full v4 upload payload so JS never
  hand-assembles it (the old game.js path hardcoded schema_version: 2
  and corrupted u64 seeds via Math.round); ReplayPlayer::from_json
  enforces schema_version == 4 with a descriptive error
- web: game.js/play.html use replay_export; replay.js surfaces player
  construction errors in the caption instead of dying silently
- server: mode validation accepts data-carrying GameMode variants
  (Difficulty uploads previously 400'd against the String field)

Both replays on prod are May-era v1 rows with empty move lists - every
shared replay was already unplayable; the viewer now says why.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

solitaire_engine/src/replay_overlay/mod.rs

@@ -383,7 +383,7 @@ pub struct ReplayOverlayMoveLogPrevRow {
 /// Marker on a "next move" row below the active row. `offset`
 /// is the 1-based distance forward from the active row:
 /// `offset = 1` is the move that will apply next
-/// (`replay.moves[cursor]`, displayed as `cursor + 1`),
+/// (`moves[cursor]`, displayed as `cursor + 1`),
 /// `offset = 2` is the one after that, and so on. Up to
 /// [`MOVE_LOG_NEXT_ROWS`] rows render below the active row.
 ///
@@ -1258,11 +1258,11 @@ fn keybind_footer_hint_text() -> &'static str {
 /// `win_move_index >= total` (defensive — shouldn't happen) doesn't
 /// position the marker outside the track.
 fn win_move_marker_pct(state: &ReplayPlaybackState) -> Option<f32> {
-    let ReplayPlaybackState::Playing { replay, .. } = state else {
+    let ReplayPlaybackState::Playing { replay, moves, .. } = state else {
         return None;
     };
     let idx = replay.win_move_index?;
-    let total = replay.moves.len();
+    let total = moves.len();
     if total == 0 {
         return None;
     }