fix(selection): selected objects keep their texture (light glow, no wash)

Selecting a textured wall/slab/item replaced its surface with a flat
purple wash. Root cause: the selection highlight clones the material and
tints it, but `NodeMaterial.clone()` on the WebGPU backend drops the
texture-map node assignments, so the clone rendered flat — and a strong
albedo blend + emissive washed whatever was left.

Fix: re-attach the maps from the source material after cloning (shared by
reference) and drop the albedo tint, keeping only a gentle indigo emissive
so the real material/texture stays readable with a soft "selected" glow.
Applied to both highlight paths:
- generic editor highlight (slabs/items) in selection-manager
- wall path (walls are excluded from the generic one), built lazily +
  cached/self-healing so it survives the wall finish's async texture load

Removes the now-dead eager wall `highlightedVisible`/`selection` profile.

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

packages/editor/src/components/editor/selection-manager.tsx

@@ -568,10 +568,12 @@ const HIGHLIGHT_PROFILES = {
     emissiveIntensity: 0.46,
   },
   selection: {
+    // Keep the real material/texture readable: no albedo tint, just a gentle
+    // indigo emissive glow so it reads as selected.
     color: new Color('#818cf8'),
-    blend: 0.32,
-    emissiveBlend: 0.7,
-    emissiveIntensity: 0.42,
+    blend: 0,
+    emissiveBlend: 0.4,
+    emissiveIntensity: 0.12,
   },
 } as const
 
@@ -596,8 +598,30 @@ function isHighlightableMesh(object: Object3D): object is Mesh {
   )
 }
 
+const TEXTURE_MAP_KEYS = [
+  'map',
+  'normalMap',
+  'roughnessMap',
+  'metalnessMap',
+  'aoMap',
+  'emissiveMap',
+  'bumpMap',
+  'displacementMap',
+  'alphaMap',
+  'lightMap',
+] as const
+
 function createHighlightedMaterial(material: Material, kind: HighlightKind): Material {
   const highlightedMaterial = material.clone() as HighlightableMaterial
+  // `NodeMaterial.clone()` on the WebGPU backend drops the texture-map node
+  // assignments, so the clone renders flat. Re-attach the maps from the source
+  // material (they're shared by reference — same texture object) so the
+  // selected object keeps its texture under the highlight.
+  const src = material as unknown as Record<string, unknown>
+  const dst = highlightedMaterial as unknown as Record<string, unknown>
+  for (const key of TEXTURE_MAP_KEYS) {
+    if (src[key]) dst[key] = src[key]
+  }
   const profile = HIGHLIGHT_PROFILES[kind]
 
   if (highlightedMaterial.color instanceof Color) {