Bug #1 (QS wrong watermark): extracted card_face_asset_path() pure helper so
the (Rank, Suit) → filename mapping is tested in isolation. 6 new unit tests
confirm all 52 keys are unique and each suit resolves to its correct letter.
QS.png has the wrong artwork baked in (confirmed via MD5); QS_BUG.md documents
the required asset replacement.
Bug #2/#3 (red square / invisible black suit on Android): add_android_corner_label
used TextFont { ..default() } which gives Bevy's built-in font — that font
lacks U+2660–U+2666, so suit glyphs rendered as a colored missing-glyph
rectangle. Threaded Option<&Handle<Font>> from sync_cards_startup/on_change →
sync_cards → spawn/update_card_entity → add_android_corner_label, which now
passes FiraMono explicitly. Non-Android builds silence the unused param with
let _ = font_handle.
Bug #4 (waste pile): static analysis found no z or fan-offset bug; two new
tests (waste_pile_cards_have_strictly_increasing_z, _draw_one_cards_have_distinct_z)
pin the invariant for future changes.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
funman300
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