Playroom UI Polish

Playroom - UI Polish Improved

1. Minimap touch support: tap and drag on the minimap now moves the camera on touchscreen devices, matching existing mouse behaviour.
2. Mobile minimap: scaled down slightly to reduce overlap with UI controls.
3. Mobile control bar: scaled down slightly and spacing tightened so buttons fit more comfortably on smaller screens.
4. Preview button: a preview button now appears in the control bar whenever a component is selected. Tap it to open the full-screen component viewer with pinch-to-zoom support.
5. UI Refresh polish.