Bookmarks, categories, favorites, quick access, recently added, link
health, and category breakdown are now all derived from real backend
data instead of hardcoded arrays. Adds an Add Bookmark modal (with
inline new-category creation) and a working favorite toggle, both
backed by the existing /api/bookmarks endpoints. Adds
createBookmarkCategory/updateBookmark to the API client.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BbJV5nm8KPVH1oNJYKpnoF
