- Prevent same player from joining as both white and black
- Add validation to reject duplicate players in RoomManager
- Fix spectator status not resetting when joining as player
- Use ref to track latest chess state in ChessBoard for accurate move validation
Swap the custom move validation and Unicode piece grid for chess.js
(full rules engine with check/checkmate/castling/en passant/promotion)
and react-chessboard (drag-and-drop SVG board). Board styled to match
the purple dark theme and auto-orients to the player's color.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
