Implement E2E Tests with Playwright #17
Description
Setup end-to-end testing for critical user workflows.
Test Scenarios:
Login → Start CLI → Execute command → View output
Navigate files → Open diff → Commit changes
Mobile view → Terminal interaction
Definition of Done:
✅ Playwright installed and configured
✅ 5 core user flow tests written
✅ Tests run in CI/CD pipeline
✅ Screenshot on test failure
✅ Cross-browser testing (Chrome, Firefox, Safari)