Cache shared 3D model loads

[starburtMr]

Fixes #93
/claim #93

Summary

• Cache load3DModel template loads by normalized URL so duplicate model URLs share in-flight/completed loader work.
• Strip only cachebust_origin from cache keys while preserving meaningful query params and hashes.
• Detect model type from the URL pathname before query/hash fragments, so model.glb?cachebust_origin=... and similar URLs route to the right loader.
• Return a cloned object per call with cloned materials so per-instance transparency/hover state cannot leak across repeated models.

Validation

• bun test tests/load-model.test.ts
• bunx biome check src/utils/load-model.ts tests/load-model.test.ts
• bunx tsc --noEmit
• bun run build
• git diff --check

Notes

• Full bun test currently has unrelated existing failures in tests/outline-bounds.test.ts and tests/preprocess-circuit-json.test.ts; the new focused loader tests pass.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 13, 2026 3:28am