Phase 5 complete: fix tests, CSS import order, update README
- Install @testing-library/dom peer dep (all 25 tests now pass)
- Move @import before @tailwind directives in app.global.css
- Rewrite README dev/build sections: npm, electron-vite, Pyodide note
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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