Sync monorepo PRs #243 and #248 to the open-source editor.
Move/Rotate Building:
- New move-building-tool with grid snapping, R/T rotation, and Esc cancel
- Floating building action menu with move button
- Building helper with keyboard shortcut hints
- BuildingRenderer now applies position and rotation from node data
Building-Relative Coordinate System:
- GridEvent gains localPosition (building-local coords)
- use-grid-events computes building-local intersection from building mesh
- ToolManager wraps building-relative tools in a building-local <group>
- All tools (wall, slab, ceiling, stair, roof, zone, polygon-editor,
placement coordinator) updated to use event.localPosition
- Placement coordinator adds worldToBuildingLocal helper for cursor
position conversion
2D Floorplan Fix:
- SVG layers wrapped in <g transform=rotate(...)> for building rotation
- Pointer-to-plan conversion un-rotates when building is rotated
- Grid events from 2D include localPosition
Store Changes:
- useEditor movingNode union includes BuildingNode
- NodeActionMenu onDelete is now optional (buildings can move but not delete)
