Support template scans and room preset workflows (#390)

* Allow template forks to preserve scans

* Add room preset save trigger

* Show room preset action for selected zones

* Use standard inspector for selected zones

* Support room preset editor workflows

* Preview room clear-underneath items

packages/nodes/src/ceiling/move-tool.tsx

@@ -126,9 +126,8 @@ export const MoveCeilingTool: React.FC<{ node: CeilingNode }> = ({ node }) => {
       deltaRef.current = [deltaX, deltaZ]
       setMeshOffset(ceilingId as AnyNodeId, deltaX, deltaZ, height)
       // Aligned with slab/fence: the delta matches the direct mesh
-      // mutation. CeilingRenderer doesn't bind position via React, so
-      // this entry isn't consumed for rendering, but kept consistent
-      // in case other systems read it.
+      // mutation. CeilingRenderer also consumes this store so external
+      // movers can preview ceilings without rebuilding the polygon.
       useLiveTransforms.getState().set(ceilingId, {
         position: [deltaX, 0, deltaZ],
         rotation: 0,

packages/nodes/src/ceiling/renderer.tsx

@@ -4,6 +4,7 @@ import {
   type CeilingNode,
   getMaterialPresetByRef,
   resolveMaterial,
+  useLiveTransforms,
   useRegistry,
   useScene,
 } from '@pascal-app/core'
@@ -79,6 +80,13 @@ export const CeilingRenderer = ({ node }: { node: CeilingNode }) => {
   const textures = useViewer((s) => s.textures)
   const colorPreset = useViewer((s) => s.colorPreset)
   const sceneTheme = useViewer((s) => s.sceneTheme)
+  const liveTransform = useLiveTransforms((s) => s.get(node.id))
+  const ceilingY = (node.height ?? 2.5) - 0.01 + (liveTransform?.position[1] ?? 0)
+  const position: [number, number, number] = [
+    liveTransform?.position[0] ?? 0,
+    ceilingY,
+    liveTransform?.position[2] ?? 0,
+  ]
 
   useEffect(
     () => () => {
@@ -124,7 +132,12 @@ export const CeilingRenderer = ({ node }: { node: CeilingNode }) => {
   ])
 
   return (
-    <mesh geometry={placeholderGeometry} material={materials.bottomMaterial} ref={ref}>
+    <mesh
+      geometry={placeholderGeometry}
+      material={materials.bottomMaterial}
+      position={position}
+      ref={ref}
+    >
       <mesh
         geometry={gridPlaceholderGeometry}
         material={materials.topMaterial}

packages/nodes/src/item/renderer.tsx

@@ -3,6 +3,7 @@
 import {
   type AnimationEffect,
   type AnyNodeId,
+  getScaledDimensions,
   type Interactive,
   type ItemNode,
   type LightEffect,
@@ -91,17 +92,25 @@ export const ItemRenderer = ({ node: storeNode }: { node: ItemNode }) => {
     () => (liveOverrides ? ({ ...storeNode, ...liveOverrides } as ItemNode) : storeNode),
     [storeNode, liveOverrides],
   )
+  const roomClearPreview =
+    (node as ItemNode & { roomClearPreview?: unknown }).roomClearPreview === true
 
   return (
     <group position={node.position} ref={ref} rotation={node.rotation} visible={node.visible}>
-      <ErrorBoundary fallback={<BrokenItemFallback node={node} />}>
-        <Suspense fallback={<PreviewModel node={node} />}>
-          <ModelRenderer node={node} />
-        </Suspense>
-      </ErrorBoundary>
-      {node.children?.map((childId) => (
-        <NodeRenderer key={childId} nodeId={childId} />
-      ))}
+      {roomClearPreview ? (
+        <ClearPreviewModel node={node} />
+      ) : (
+        <>
+          <ErrorBoundary fallback={<BrokenItemFallback node={node} />}>
+            <Suspense fallback={<PreviewModel node={node} />}>
+              <ModelRenderer node={node} />
+            </Suspense>
+          </ErrorBoundary>
+          {node.children?.map((childId) => (
+            <NodeRenderer key={childId} nodeId={childId} />
+          ))}
+        </>
+      )}
     </group>
   )
 }
@@ -133,6 +142,26 @@ const PreviewModel = ({ node }: { node: ItemNode }) => {
   )
 }
 
+const ClearPreviewModel = ({ node }: { node: ItemNode }) => {
+  const shading = useViewer((s) => s.shading)
+  const [w, h, d] = getScaledDimensions(node)
+  const material = useMemo(() => {
+    const next = createDefaultMaterial('#ef4444', 1, shading) as MutableMaterial
+    next.depthTest = false
+    next.opacity = 0.35
+    next.transparent = true
+    next.wireframe = true
+    next.needsUpdate = true
+    return next
+  }, [shading])
+
+  return (
+    <mesh material={material} position-y={h / 2}>
+      <boxGeometry args={[w, h, d]} />
+    </mesh>
+  )
+}
+
 const multiplyScales = (
   a: [number, number, number],
   b: [number, number, number],