0.12.2 — unfreeze the office

Fixes the frozen office: the canvas floor scheduled exponential frames and locked the UI seconds after boot. Also: floor clicks now use the right coordinate space, the canvas class/start position are fixed, and the camera auto-fits the room.

The game floor (ADR-0063) is now fully playable: click carpet to walk, click a person to DM, click a door to switch rooms, drag to pan, wheel to zoom, live speech bubbles.