Merge origin/main into feat/placement-interaction-overhaul

Resolve 7 conflicts keeping our snapping migration + floorplan perf work as
source of truth, combined with main's MEP run-continuation / Alt-detach /
latch handles. Rebuilt two import blocks the auto-merge silently truncated
(node-arrow-handles.tsx, duct-fitting/move-tool.tsx).

Verified: tsc clean across core/viewer/editor/nodes/mcp, 451 tests pass,
biome clean. Floorplan view-transform re-render storm confirmed pre-existing
(not introduced by this merge).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/nodes/src/item/renderer.tsx

@@ -8,6 +8,7 @@ import {
   type Interactive,
   type ItemNode,
   isSlotMaterialName,
+  itemClipRegistry,
   LIBRARY_MATERIAL_REF_PREFIX,
   type LightEffect,
   SCENE_MATERIAL_REF_PREFIX,
@@ -379,7 +380,7 @@ const ModelRenderer = ({ node }: { node: ItemNode }) => {
       mesh.castShadow = !hasGlass
       mesh.receiveShadow = !hasGlass
     }
-  }, [ref, scene, shading, textures, colorPreset, node.slots, sceneMaterials])
+  }, [shading, textures, colorPreset, node.slots, sceneMaterials])
 
   const interactive = interactiveRef.current
   const animEffect =
@@ -387,6 +388,20 @@ const ModelRenderer = ({ node }: { node: ItemNode }) => {
   const lightEffects =
     interactive?.effects.filter((e): e is LightEffect => e.kind === 'light') ?? []
 
+  // Expose this item's ambient clip (e.g. a fan's spin) to the GLB bake. The
+  // catalog GLB owns the clip; it isn't in the scene graph, so the export can't
+  // find it without this registry. The bake retargets it onto the baked subtree.
+  useEffect(() => {
+    if (!animEffect) return
+    const clipName = animEffect.clips.on ?? animEffect.clips.loop
+    const clip = clipName ? animations.find((c) => c.name === clipName) : undefined
+    if (!clip) return
+    itemClipRegistry.set(node.id, { clip, loop: true })
+    return () => {
+      itemClipRegistry.delete(node.id)
+    }
+  }, [node.id, animEffect, animations])
+
   // useGLTF caches scenes, and Clone shares child geometry/material references.
   // Undo can unmount one item while another clone of the same asset still needs them.
   return (