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/core/src/schema/index.ts

@@ -1,5 +1,5 @@
 // Base
-export { BaseNode, generateId, nodeType, objectId } from './base'
+export { BaseNode, generateId, Material, nodeType, objectId } from './base'
 // Camera
 export { CameraSchema } from './camera'
 // Collections