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/r3f.d.ts

@@ -78,18 +78,21 @@ interface ThreeJSXElements {
 }
 
 declare module 'react' {
+  // biome-ignore lint/style/noNamespace: Required for JSX module augmentation
   namespace JSX {
     interface IntrinsicElements extends ThreeJSXElements {}
   }
 }
 
 declare module 'react/jsx-runtime' {
+  // biome-ignore lint/style/noNamespace: Required for JSX module augmentation
   namespace JSX {
     interface IntrinsicElements extends ThreeJSXElements {}
   }
 }
 
 declare module 'react/jsx-dev-runtime' {
+  // biome-ignore lint/style/noNamespace: Required for JSX module augmentation
   namespace JSX {
     interface IntrinsicElements extends ThreeJSXElements {}
   }