Mobile UI:
- Responsive layout for all views (Sandbox, World Map, Puzzle View)
- Bottom sheet with swipe gestures for module palette and puzzle tabs
- Mobile tab bar navigation (Game/Sandbox/Config)
- Touch panning, pinch-to-zoom, native zoom blocking
- PWA support (installable, offline-capable)
New modules:
- Drum Pad (🥁): 4x4 colored pad grid with gate/freq output
- CV→Gate (⚡): converts continuous CV to gate signal with threshold
- Fullscreen mode for Keyboard and Drum Pad (portal-based)
Audio engine:
- Global master clock (120 Hz) with time-derived ticks (no drift)
- Connection cache with dirty flag (zero overhead on cache hit)
- Reduced main thread pressure (throttled RAF loops, lower clock rate)
- VCA properly zeroes with CV control, envelope release min 0.001s
- Audio context unlocked on first interaction for immediate UI sounds
