Categories sidebar:
- Collapsible first column with category management
- Create new categories directly from sidebar
- Thin tab when collapsed
- Moved user info, logout, and theme selector here
Note editor redesign:
- Clean toolbar with pill-style buttons
- Category dropdown with folder icon
- Preview toggle in toolbar
- Streamlined action buttons
Floating formatting toolbar:
- Appears on text selection
- Bold, italic, strikethrough, code, code block, quote, lists, link, headings
- Active state highlighting for applied formats
- Toggle behavior removes formatting if already applied
Focus mode:
- Hides sidebars for distraction-free writing
- Content centered with max-width
- Escape key to exit
- Scrolling works from anywhere in viewport
