Cache cloned glTF model loads

[ldmstudio7]

Summary

• add a global glTF/GLB loader cache that mirrors the existing global OBJ cache
• return fresh Object3D clones with cloned material instances for each consumer
• reuse the clone helper in the OBJ/WRL cache so transparency, hover, and env-map mutations do not leak into cached source objects or duplicate model instances

Fixes #93.

Validation

• npm install --legacy-peer-deps --package-lock=false
• biome format --write src/hooks/use-global-gltf-loader.ts src/utils/clone-object3d-with-materials.ts src/hooks/use-global-obj-loader.ts src/three-components/GltfModel.tsx tests/clone-object3d-with-materials.test.ts
• tsc --noEmit
• npm run build
• bun test tests/clone-object3d-with-materials.test.ts
• bun test tests/clone-object3d-with-materials.test.ts tests/cad-model-transform.test.ts tests/resolve-model-url.test.ts tests/vrml-loader.test.ts
• npm run test:node-bundle

Note: the full bun test suite still has unrelated pre-existing failures in outline-bounds and preprocess-circuit-json assertions.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 31, 2026 11:32pm

[MikeGarciaAGM]

Looks good to me.