- Added 'Generate PIN' button to all game overlays
- Users can now choose to enter existing PIN or generate new unique PIN
- Generated PIN appears instantly in input field with green highlight
- Shows 'PIN Generated: XXXXXX' confirmation message
- Supports all 7 games: Gift Catcher, Traoom, Neon Puzzle, Rhythm Beat, Cosmic Arena, Crystal Tetris, Aurora Jumper
- Renamed 'secret code' to 'PIN' throughout UI
- Added PIN explainer text explaining how system identifies players
- New players get random 6-char PIN, must save it
- Players use name + PIN to update scores
- PIN ensures unique identification for each player