feat(paint-slots): KTX2 finish library — fabric/leather/concrete/metal (phase 4)
Wire KTX2 into the catalog finish path and add 15 textured finishes across four new families, all as GPU-compressed KTX2 (512px) + a webp picker thumbnail. - Shared `ktx2-loader.ts`: one KTX2Loader (Basis transcoder) used by both the GLB loader and catalog textures; `ensureKtx2Support(renderer)` runs once at viewer init (GPUDeviceWatcher) so `.ktx2` finishes load even with no GLB in the scene. `use-gltf-ktx2` now reuses the shared instance. - `materials.ts`: texture loaders pick the KTX2 loader for `.ktx2` urls, the image loader otherwise (all three load paths). - `material-library.ts`: 15 entries (fabric ×6, leather ×2, concrete ×4, metal ×3). Neutral albedo for tinting, `flipY: false` (compressed textures can't flip), `repeat` per real-world tile size, metals `metalness: 1`. Normals encoded UASTC, data maps ETC1S/linear. Assets generated from raw sources via the new community `scripts/build-material-textures.ts`. 1024/256 tiers + raws kept out of git. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Wassim SAMAD
Claude Opus 4.8
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