- Add visual discard pile with card sprite and count badge
- Center action buttons and remove redundant Play Treasures button
- Track in-play cards for accurate animation source positions
- Refactor `setState` to handle discard, gain, and draw animations sequentially
- Add multi-phase discard animation (fly face-up, fold, unfold face-down)
- Add gain card animation to deck or discard pile
- Improve animation queue handling with `_animating` and `_pendingAnimState`
Brian Fertig
7e3c7d8e3d
