- Persist puzzle start time in state for accurate session tracking
- Display elapsed time (HH:MM:SS) and connected players in a new "Room Stats" panel
- Update players list on join/left events and network sync
- Refine UI button styling for consistency with main theme
- Added 12 new puzzle images with corresponding 576×324 thumbnails
- Extended `puzzles.json` to include all new puzzles
- Implemented background selection in `NewPuzzleScene.js` (Dark Wood / Green Felt)
- Updated thumbnail display logic to use `thumb_` prefixed versions
- Added background key/path state propagation to `PuzzleState`, network join, and room creation
- Tiled background texture across the playfield in `PuzzleScene.js`
- Enhanced room code UI styling for better visibility
Brian Fertig