Dispose generated model resources on cleanup

[jeffreybarts-max]

Summary

• Add a small Three.js cleanup helper that disposes mesh geometries and both single/material-array materials.
• Dispose generated Footprinter and JSCAD model resources when React removes those generated objects.
• Add unit coverage for nested mesh cleanup and material-array cleanup.

Testing

• bunx biome check src/utils/dispose-three-object-resources.ts src/three-components/FootprinterModel.tsx src/three-components/JscadModel.tsx tests/dispose-three-object-resources.test.ts
• bunx tsc --noEmit
• bun run build
• bun run test:node-bundle
• Targeted Bun test for tests/dispose-three-object-resources.test.ts without the global snapshot preload

Note: the default repo-wide bun test path is blocked in this local Windows checkout by the unrelated sharp native module used by the snapshot preload, so I validated the new test in isolation plus the package build/type/bundle checks above.

/claim #93

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Project	Deployment	Actions	Updated (UTC)
3d-viewer	Ready	Preview, Comment	May 20, 2026 6:27pm