- Add Open Notebook, Unlock Article, and Transcribe buttons to header
- Move search bar to center of header across all pages
- Rename "AI Notebook" to "Open Notebook" throughout
- Support ?type= query param on /notes/new for deep-linking
- Reorganize AppSwitcher categories (Creating, Sharing, Observing)
- Move rTube and rSwag to Creating category
- Update EcosystemFooter link order to match new categories
- Update header bg to bg-slate-900/85
- Add key emojis to UserMenu sign-in states
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>