Support STL CAD models in the shared loader

[nurik-1618]

Summary

• pass the CAD mesh model type into MixedStlModel so extensionless CDN URLs can still use the right loader
• add an STL path to the existing shared model loader instead of parsing model_stl_url responses as OBJ text
• keep cache keys stable by stripping only cachebust_origin and namespacing by loader type
• add regression coverage for extensionless STL URLs, cache-key normalization, and STL parsing

Fixes a remaining model-loading gap for #93.

/claim #93

Verification

• bun test tests/global-model-loader.test.ts
• bun x biome check src/AnyCadComponent.tsx src/hooks/use-global-obj-loader.ts src/three-components/MixedStlModel.tsx tests/global-model-loader.test.ts
• bun x tsc --noEmit
• bun run build
• bun run test:node-bundle
• git diff --check

Full test note

• bun test has 3 existing unrelated failures on current main expectations: two tests/preprocess-circuit-json.test.ts z-offset assertions expect 0.8/1.8 while current output is 0.7/1.7, and tests/outline-bounds.test.ts expects rgb(39,89,56) while current output contains nearby soldermask colors. The new focused STL loader test passes.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 12, 2026 6:33am