Fix GLTF model lifecycle cleanup

[DYSfu]

/claim #93

Summary

• Load GLTF/GLB assets only when gltfUrl changes, so translucent-state toggles no longer start another GLTFLoader request.
• Clear stale GLTF state on URL changes and dispose scenes that finish loading after unmount.
• Add a small Object3D resource disposer for owned geometries, materials, and material textures, with coverage that shared environment maps are left intact.

Validation

• bun test tests/dispose-object3d-resources.test.ts
• bunx biome check src/utils/dispose-object3d-resources.ts src/three-components/GltfModel.tsx tests/dispose-object3d-resources.test.ts
• bunx tsc --noEmit --pretty false
• bun run build
• git diff --check

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 24, 2026 12:50pm

[MikeGarciaAGM]

Looks good. Cleaning up GLTF lifecycle resources is the right fix here, and the test coverage matches the intended disposal behavior.