Build a markdown editor with:
- Split pane: editor on left, live preview on right
- Syntax highlighting in the editor
- Support for headings, bold, italic, links, images, code blocks, lists, tables
- Toolbar with formatting buttons
- Export to HTML and download as .md file
- Word and character count
- Full-screen mode
- Dark/light theme toggle
- Store content in localStorage
Put in ~/data/public/