Cache inline STL data geometry

[fangzheli]

/claim #93

Summary

• Cache parsed inline stlData ArrayBuffer geometry with a WeakMap.
• Return a cloned BufferGeometry per caller so each mounted STLModel can dispose safely during cleanup.
• Wire only the inline STLModel stlData path through the cache; the stlUrl loader path is unchanged.

Non-overlap

The active PRs I found cover OBJ cache keys, GLTF/GLB loading, direct STL URL geometry loading, STEP-to-GLB conversion, and generic load3DModel URL detection. This PR only addresses repeated parsing for inline stlData ArrayBuffers.

Verification

• npx --yes bun test tests/load-cached-stl-data-geometry.test.ts
• npx --yes bun x biome check src/three-components/STLModel.tsx src/utils/load-cached-stl-data-geometry.ts tests/load-cached-stl-data-geometry.test.ts
• npx --yes bun x tsc --noEmit
• npx --yes bun run build
• git diff --check
• npx --yes bun run test:node-bundle

Full npx --yes bun test currently reports 25 passing tests and 3 failures in tests/outline-bounds.test.ts and tests/preprocess-circuit-json.test.ts; the new focused STL cache test passes.

AI-assisted with Codex; I reviewed the diff and kept the change scoped.

Demo Video

• https://github.com/fangzheli/3d-viewer/blob/demo-video-pr-888/pr-888-inline-stl-cache-demo-short.mp4

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 14, 2026 8:54am

[fangzheli]

Demo video for the UI/3D viewer requirement:

https://github.com/fangzheli/3d-viewer/blob/demo-video-pr-888/pr-888-inline-stl-cache-demo-short.mp4

This recording only captures the Storybook iframe for the 3D viewer and shows the model rendering plus orbit interaction.