Migrate 3D abacus preview generation from server-side OpenSCAD to client-side
WASM execution using web workers.
Changes:
- Add openscad-wasm-prebuilt dependency for browser-based rendering
- Refactor STLPreview to use web worker for non-blocking WASM execution
- Create openscad.worker.ts for isolated 3D model generation
- Add abacus-inline.scad template for parametric abacus generation
- Improve preview debouncing (500ms) and error handling
Benefits:
- No server-side OpenSCAD dependency required
- Faster preview updates (no network roundtrip)
- Better UX with non-blocking worker execution
- Consistent rendering across environments
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>