sync: comprehensive monorepo → editor parity (2D/3D decoupling, UX polish, crash fixes)

Squash merge of 3 commits:
1. useLiveTransforms store for 2D/3D decoupling + floorplan overhaul + Sentry crash fixes
2. Comprehensive 59-file sync bringing editor to full monorepo parity (selection highlights, delete tool, furnish/zone modes, keyboard shortcuts, all panels)
3. Missing files fix (materials.ts, merged-outline-node.ts, type fix)

75 files changed, ~6K additions.

packages/viewer/src/components/renderers/slab/slab-renderer.tsx

@@ -23,8 +23,8 @@ export const SlabRenderer = ({ node }: { node: SlabNode }) => {
       receiveShadow
       ref={ref}
       {...handlers}
-      visible={node.visible}
       material={material}
+      visible={node.visible}
     >
       <boxGeometry args={[0, 0, 0]} />
     </mesh>