docs(ui): document launch readiness checklist verification status
- Updated checklist to distinguish code-inspection items from testing-required items
- Noted which items require Playwright, visual testing, or manual verification
- Added Launch Readiness Checklist Verification section documenting partial status
- Code inspection complete for static analysis items
- Remaining items require: Playwright screenshots, visual testing, keyboard navigation testing, form validation testing, CI setup, Storybook setup