Implements Phase 2 of CARD_PLAN.md — the data types and `.theme.ron`
asset loader that build on Phase 1's SVG rasteriser.
solitaire_engine/src/theme/
mod.rs — CardKey { suit, rank } as the HashMap lookup key
(distinct from solitaire_core::Card which carries
per-deal id + face_up state); CardKey::all() yields
the 52 keys in suit-major / rank-ascending order;
manifest_name() and parse_manifest_name() round-trip
via the canonical "{suit}_{rank}" form.
ThemeMeta with structural validation (id non-empty,
no path separators, non-zero aspect components).
CardTheme #[derive(Asset, TypePath)] storing the
53 image handles + meta.
manifest.rs — ThemeManifest { meta, back, faces } with serde for
RON round-trip. validate() returns a strongly-typed
HashMap<CardKey, PathBuf>, surfacing precise errors
for unknown face keys, missing-of-52 entries, and
duplicate keys (RON silently keeps the last; brittle
for a release).
loader.rs — AssetLoader for .theme.ron. Validates manifest, then
composes sibling SVG paths via AssetPath::resolve so
the same loader works for both embedded:// and
themes:// asset sources (Phase 3 territory).
Schedules every face + back load through SvgLoader
with target_size derived from meta.card_aspect.
24 new tests covering: 52-key enumeration uniqueness, manifest-name
round trip, garbage-name rejection, complete/missing/unknown/duplicate
manifest validation, RON round-trip integrity, target-size aspect
math (2:3 → 512x768; non-standard; degenerate 1:10000 clamps to 1px).
Workspace deps added: ron 0.12.
cargo build / clippy --workspace --all-targets -- -D warnings / test
all green (937 passed total — +24 from Phase 2 vs the +7 from
Phase 1's b8fb3fb baseline).
funman300
936d035750