- Add customizable playfield backgrounds with localStorage persistence
- Display multiplier labels on gold (1.5x) and diamond (2x) tiles
- Replace simple fade-in refill with Bejeweled-style falling tile animations
- Swap SUBMIT and CLEAR button positions for better UX
- Add new opponents (Gerome, Fireball, Natasha) with voice lines and convo files
- Reduce conversation interval from 60-300s to 20-200s
- Enable DEBUG_CONVOS for development
