Add furniture click events, OrbitControls toggle, and floor change event

- Export COLORS for external module access (themes)
- Extend _onClick to detect furniture clicks before room clicks,
  dispatching 'furnitureclick' with catalog/room/mesh details
- Add setControlsEnabled(enabled) to toggle OrbitControls
- Dispatch 'floorchange' event from showFloor()
- Wire up furnitureclick in index.html to show item info

src/index.html

@@ -151,6 +151,11 @@
     viewer.addEventListener('roomclick', (e) => {
       selectRoom(e.detail.roomId);
     });
+
+    viewer.addEventListener('furnitureclick', (e) => {
+      const d = e.detail;
+      document.getElementById('info').textContent = `${d.itemName} — in ${renderer.getRooms().find(r => r.id === d.roomId)?.name || d.roomId}`;
+    });
   </script>
 </body>
 </html>

src/renderer.js

@@ -1,7 +1,7 @@
 import * as THREE from 'three';
 import { OrbitControls } from 'three/addons/controls/OrbitControls.js';
 
-const COLORS = {
+export const COLORS = {
   wall: {
     exterior: 0xe8e0d4,
     interior: 0xf5f0eb
@@ -151,6 +151,14 @@ export class HouseRenderer {
     }
 
     this._placeFurnitureForFloor();
+
+    this.container.dispatchEvent(new CustomEvent('floorchange', {
+      detail: { index, floor }
+    }));
+  }
+
+  setControlsEnabled(enabled) {
+    this.controls.enabled = enabled;
   }
 
   _clearFloor() {
@@ -506,9 +514,23 @@ export class HouseRenderer {
 
     for (const hit of intersects) {
       let obj = hit.object;
-      while (obj && !obj.userData.roomId) {
+      // Walk up to find furniture or room group
+      while (obj && !obj.userData.isFurniture && !obj.userData.roomId) {
         obj = obj.parent;
       }
+      if (obj && obj.userData.isFurniture) {
+        this.container.dispatchEvent(new CustomEvent('furnitureclick', {
+          detail: {
+            catalogId: obj.userData.catalogId,
+            roomId: obj.userData.roomId,
+            itemName: obj.userData.itemName,
+            wallMounted: obj.userData.wallMounted,
+            mesh: obj,
+            point: hit.point
+          }
+        }));
+        return;
+      }
       if (obj && obj.userData.roomId) {
         this.highlightRoom(obj.userData.roomId);
         this.container.dispatchEvent(new CustomEvent('roomclick', {