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/index.ts

@@ -1,5 +1,3 @@
-// Store
-
 export type {
   BuildingEvent,
   CameraControlEvent,
@@ -20,9 +18,7 @@ export type {
   WindowEvent,
   ZoneEvent,
 } from './events/bus'
-// Events
 export { emitter, eventSuffixes } from './events/bus'
-// Hooks
 export {
   sceneRegistry,
   useRegistry,
@@ -33,24 +29,22 @@ export {
   resolveLevelId,
 } from './hooks/spatial-grid/spatial-grid-sync'
 export { useSpatialQuery } from './hooks/spatial-grid/use-spatial-query'
-// Asset storage
 export { loadAssetUrl, saveAsset } from './lib/asset-storage'
-// Space detection
 export {
   detectSpacesForLevel,
   initSpaceDetectionSync,
   type Space,
   wallTouchesOthers,
 } from './lib/space-detection'
-// Schema
+export { baseMaterial, glassMaterial } from './materials'
 export * from './schema'
 export {
   type ControlValue,
   type ItemInteractiveState,
   useInteractive,
 } from './store/use-interactive'
+export { default as useLiveTransforms, type LiveTransform } from './store/use-live-transforms'
 export { clearSceneHistory, default as useScene } from './store/use-scene'
-// Systems
 export { CeilingSystem } from './systems/ceiling/ceiling-system'
 export { DoorSystem } from './systems/door/door-system'
 export { ItemSystem } from './systems/item/item-system'
@@ -71,5 +65,6 @@ export {
 } from './systems/wall/wall-mitering'
 export { WallSystem } from './systems/wall/wall-system'
 export { WindowSystem } from './systems/window/window-system'
+export type { SceneGraph } from './utils/clone-scene-graph'
 export { cloneLevelSubtree, cloneSceneGraph, forkSceneGraph } from './utils/clone-scene-graph'
 export { isObject } from './utils/types'