- Add jello-items spritesheet for wall and spike decorations
- Replace solid-color floor with checkerboard pattern using new palette
- Add pulsing animation to target squares
- Implement animated beacon rings around targets on level start
- Redesign walls and spikes to use sprite frames instead of drawn graphics
- Adjust UI text positioning in MahjongMatch, Zuma, and Shift games
- Reposition Shift game buttons to bottom-right corner with consistent sizing
- Load jello-items spritesheet in PreloadScene
