Fix glTF model lifecycle cleanup

[kpoxo6op]

/claim #93

Summary

• stop reloading GLTF scenes when only isTranslucent changes
• clear and dispose previous GLTF scenes on URL replacement/unmount, and dispose late-loaded scenes after cleanup
• add focused tests for material-state updates and shared resource disposal

Validation

• npm exec -- bun test tests/gltf-scene-lifecycle.test.ts
• ./node_modules/.bin/biome check src/utils/gltf-scene-lifecycle.ts src/three-components/GltfModel.tsx tests/gltf-scene-lifecycle.test.ts
• ./node_modules/.bin/tsc --noEmit --pretty false
• npm run build
• git diff --check

Note

• Full npm exec -- bun test tests currently fails in existing outline-bounds and preprocess-circuit-json assertions outside this patch.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 22, 2026 6:14am