fix(paint-slots): disable the CSG cutout's raycast so window/door paint hits the slots

The real interceptor was the 'cutout' mesh, not the hitbox: it's a 1m-deep CSG
helper whose front face sits 0.5m proud of the glass, and current three.js
raycasts invisible meshes — so every paint/hover ray resolved to 'cutout'
(no slotId → role null). Disable its raycast; combined with the hitbox noop,
paint/hover rays now land on the tagged frame/glass (panel/glass) children.

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

packages/viewer/src/systems/door/door-system.tsx

@@ -2412,6 +2412,10 @@ function syncDoorCutout(node: DoorNode, mesh: THREE.Mesh) {
   if (!cutout) {
     cutout = new THREE.Mesh()
     cutout.name = 'cutout'
+    // The cutout is a 1m-deep CSG helper for the wall hole — never interactive.
+    // three.js raycasts invisible meshes, so without this its front face (0.5m
+    // proud of the door) intercepts every paint/hover ray.
+    cutout.raycast = noopHitboxRaycast
     mesh.add(cutout)
   }
   cutout.geometry.dispose()

packages/viewer/src/systems/window/window-system.tsx

@@ -3500,6 +3500,10 @@ function syncWindowCutout(node: WindowNode, mesh: THREE.Mesh) {
   if (!cutout) {
     cutout = new THREE.Mesh()
     cutout.name = 'cutout'
+    // The cutout is a 1m-deep CSG helper for the wall hole — never interactive.
+    // three.js raycasts invisible meshes, so without this its front face (0.5m
+    // proud of the glass) intercepts every paint/hover ray.
+    cutout.raycast = noopHitboxRaycast
     mesh.add(cutout)
   }
   cutout.geometry.dispose()