- Expand the play field to a 3840x2160 world so pieces can scatter widely and the player can explore
- Introduce MIN_ZOOM (0.5) so the entire field fits on screen, with zoom anchored to the cursor
- Add a second fixed HUD camera so the menu, stats bar, and win overlay stay in screen space while the board camera pans/zooms
- Route world objects and UI containers to their respective cameras via cameraFilter
- Update background, scatter tray, and camera clamping to use the new world dimensions
