Note-Taking App with AI

Build an AI-powered note-taking application:

## Editor
- Rich text editor with markdown shortcuts
- Block-based editing (headings, paragraphs, lists, code, quotes)
- Slash commands (/heading, /list, /code, /divider)
- Drag and drop to reorder blocks
- Inline formatting toolbar (bold, italic, link, highlight)

## AI Features
- "Ask AI" button that opens a side panel
- Summarize current note
- Expand a bullet point into a full paragraph
- Fix grammar and spelling
- Translate note to another language
- Generate action items from meeting notes

## Organization
- Folder tree in sidebar
- Tags with color coding
- Search across all notes (full text)
- Favorites/pinned notes
- Recently edited section
- Trash with recovery

## Collaboration (optional)
- Share note via link (view or edit access)
- Real-time cursor presence
- Comment threads on specific text

Design: Notion-inspired clean interface. Light gray sidebar, white editor area. Monospace font option for code. Dark mode support.