- Add StyleContext class for extracting and applying HTML attributes/styles
- Enhance MarkdownConverter with style-aware conversion methods
- Switch backend storage from markdown to HTML with 'html' content type
- Update editor workflow to preserve CSS classes, IDs, and attributes
- Maintain markdown editing UX while storing HTML for style preservation
- Support complex attributes like rel, data-*, aria-*, etc.
This enables editing styled content like <a class="fancy" rel="me">text</a>
while preserving all styling attributes through the markdown editing process.