Replace plain Markdown textarea with TipTap editor featuring:
- Toolbar with bold, italic, strike, code, headings, lists, tasks,
blockquotes, code blocks, links, images, undo/redo
- Keyboard shortcuts (Ctrl+B, Ctrl+I, etc.)
- Task list with checkboxes
- Inline image embedding
- Code type notes still use plain textarea for monospace editing
- Note detail view now renders HTML content from TipTap
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>