fix: hidden walls no longer swallow pointer events

packages/nodes/src/wall/renderer.tsx

@@ -52,7 +52,31 @@ const WallRenderer = ({ node }: { node: WallNode }) => {
     }
   }, [collisionPlaceholderGeometry, placeholderGeometry])
 
-  const handlers = useNodeEvents(node, 'wall')
+  const rawHandlers = useNodeEvents(node, 'wall')
+  // Hidden walls are pointer-TRANSPARENT: when the wall-mode pass hides this
+  // wall (`WallCutout` stamps `userData.wallHidden` — X-ray 'down' mode,
+  // cutaway-hidden faces, auto-mode interior partitions), its invisible
+  // full-height collision mesh must not swallow pointer events aimed at
+  // visible objects behind it (wall-mounted plugin nodes, items). Returning
+  // early without stopPropagation lets R3F continue to the next intersection.
+  // Delete mode keeps the events so hidden walls stay hover-targetable for
+  // deletion (the deleteInvisible highlight flow).
+  const handlers = useMemo(() => {
+    const gated = {} as typeof rawHandlers
+    for (const key of Object.keys(rawHandlers) as (keyof typeof rawHandlers)[]) {
+      const fn = rawHandlers[key] as (e: unknown) => void
+      ;(gated as Record<string, (e: unknown) => void>)[key] = (e: unknown) => {
+        if (
+          ref.current?.userData?.wallHidden === true &&
+          useViewer.getState().hoverHighlightMode !== 'delete'
+        ) {
+          return
+        }
+        fn(e)
+      }
+    }
+    return gated
+  }, [rawHandlers])
   const shading = useViewer((s) => s.shading)
   const textures = useViewer((s) => s.textures)
   const colorPreset = useViewer((s) => s.colorPreset)

packages/viewer/src/systems/wall/wall-cutout.tsx

@@ -164,6 +164,19 @@ export const WallCutout = () => {
         if (wallNode?.type !== 'wall') return
 
         const hideWall = getWallHideState(wallNode, wallMesh as Mesh, wallMode, u)
+        // Pointer transparency for hidden walls: the wall's full-height
+        // collision mesh keeps raycasting even when the wall draws with the
+        // invisible material ('down' mode, cutaway-hidden faces, auto-mode
+        // interior partitions), so it silently swallows clicks aimed at
+        // VISIBLE objects standing behind it — e.g. a plugin's wall-mounted
+        // device/service boxes in X-ray mode (night-5 D4: the arm click on a
+        // south-wall receptacle selected an invisible wall two meters in
+        // front of it instead, and the follow-up click committed a WALL
+        // move). The wall renderer's pointer handlers read this stamp and
+        // pass hidden walls through (delete mode excepted — hidden walls
+        // must stay hover-targetable for deletion). Translucent walls are
+        // visible, so they keep their events.
+        ;(wallMesh as Mesh).userData.wallHidden = wallMode !== 'translucent' && hideWall
         const isDeleteHighlighted = deleteHoveredWallId === wallId
         const isSelectionHighlighted = !isDeleteHighlighted && highlightedWallIds.has(wallId)
         const levelId = resolveLevelId(wallNode, sceneState.nodes)