- friends.php: create domino invites in domino_matches table (not chess matches)
- friends.php: check-invites scans domino_matches + ludo_matches tables
- friends.php: accept/decline route to correct game table by game_key
- domino-match.php: merge hands on move (preserve other player's hand data)
- game.js: host deals and syncs both hands; guest waits for deal via polling
- game.js: new rounds in live mode dealt by host only
- lobby.js: pass playerIndex from accept response
- chat.js: add domino option to in-chat challenge dialog
- friends.js: pass game_key on accept/decline calls
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>