chore: biome auto-format pass (resolve persistent dirty-tree noise)

These files had been showing as modified in every dev session — biome's
canonical formatting (line-length collapses, import sort, type-modifier
placement) didn't match the committed state. No semantic changes.
Committing now so the working tree stays clean across sessions.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

packages/viewer/src/hooks/use-gltf-ktx2.tsx

@@ -36,4 +36,5 @@ const useGLTFKTX2 = (path: string): ReturnType<typeof useGLTF> => {
     loader.setMeshoptDecoder(MeshoptDecoder)
   })
 }
+
 export { useGLTFKTX2 }