Implemented DELETE `/games/{game_id}` endpoint allowing hosts to cancel games with cascade deletion of sheet states, chips, and memberships. Added `cancelGame` handler in App.jsx to delete game, refresh game list, reset state, and show confirmation snack. Added cancel button to GamePickerCard lobby section (pre-start) and started section (non-finished games) with bilingual confirmation dialog, loading state, and error handling.
nessi
b20056913b