Summary

• Adds product improvement research and desktop distribution docs
• Adds Electron desktop shell and electron-builder packaging for Linux, Windows 11, and macOS
• Adds Playwright browser sandbox smoke tests and CI integration
• Hardens malformed import handling, clipboard failure handling, and status accessibility

Verification

• npm test
• npm run e2e
• npm run typecheck
• npm run build
• npm run dist:linux
• npm audit --audit-level=moderate

Notes

• Linux AppImage and deb were built locally.
• Windows installer is configured but local Linux build needs Wine; release workflow uses Windows runner.
• macOS installer is configured but release-quality signing/notarization requires macOS runner and Apple credentials.