Cache GLTF model loads by URL

[a861046612-eng]

Fixes #93

Summary

• Add a shared GLTF/GLB loader cache keyed by model URL
• Reuse in-flight and completed GLTF loads so repeated components do not trigger duplicate network requests
• Return cloned scenes with cloned materials for each component instance so hover/translucency/env-map changes remain isolated
• Clear failed cache entries so transient load failures can be retried

Testing

• npx bun x tsc --noEmit
• npx bun test tests/global-gltf-loader.test.ts tests/cad-model-transform.test.ts
• npm run build

Note: full npx bun test still has pre-existing failures in SVG color / faux board Z-offset tests that are unrelated to GLTF loading.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 12, 2026 5:39pm