fix(engine): render card suit glyphs as SVG paths instead of text
The user's first post-migration screenshot showed near-invisible suit glyphs on every card — the rank rendered at correct size but the ♠ ♥ ♦ ♣ marks were tiny dots regardless of the requested 20px / 64px font-size. Root cause: the bundled FiraMono in svg_loader::shared_fontdb doesn't carry usable Unicode suit glyphs (U+2660-2666). usvg silently fell back to a substitute rendering at default size, producing the "tofu" effect. Fixes by replacing the `<text>` glyph rendering with inline SVG paths. `suit_path_d(suit)` returns a single closed-perimeter path authored in a 32 × 32 logical box, then face_svg wraps it in two `<g transform>` blocks (top-left small + bottom-right rotated large). Path-based rendering bypasses the font system entirely — same bytes on every machine, no fontdb dependency, no substitution risk. Same path data renders correctly whether filled (♥ ♠) or outlined (♦ ♣ — the always-on color-blind glyph differentiation from the design system). Knock-on changes that must land in this commit per the migration plan's lockstep rule: - `EXPECTED` in tests/card_face_svg_pin.rs rebaselined: 52 face hashes change (text → path), 5 back hashes unchanged (back_svg untouched). The bootstrap pattern in the test handled the rebaseline cleanly — empty EXPECTED, re-run, paste, re-run. - assets/cards/faces/*.png regenerated (the 52 face PNGs). - solitaire_engine/assets/themes/default/*_*.svg regenerated (the 52 theme face SVGs that production rasterises at startup). Both rendering paths must agree. Workspace clippy + cargo test --workspace clean. Pin test passes against the new hashes. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
funman300
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