Detect model extensions before query strings

[jorgeschulz]

Summary

/claim #93

• adds getModelFileExtension so load3DModel detects file type from the URL path before query/hash suffixes
• preserves the original URL passed to STL/OBJ/WRL/GLTF loaders
• fixes valid URLs like model.glb?cachebust_origin=... being treated as unsupported
• adds regression coverage for .glb, .obj, .stl, and .wrl URLs with query/hash suffixes

Verification

• npx --yes bun@latest test tests/load-model-url-extension.test.ts
• npx --yes bun@latest x tsc --noEmit
• npx --yes bun@latest x biome check src/utils/load-model.ts tests/load-model-url-extension.test.ts
• npx --yes bun@latest run build
• git diff --check

Full test note

• npx --yes bun@latest test has 3 existing unrelated failures on current main: 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 SVG contains nearby soldermask colors.

AI-assisted with Codex; I reviewed the diff and ran the checks above before opening this PR.

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 12, 2026 2:20pm