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>
