A lot happened..

Added notifications for follows, likes, dislikes, comments, mentions, and comment reactions. Replaced navbar text links with cleaner icon navigation. Added a mobile bottom bar and improved small-screen layout. Added @username mentions for Lines and comments. Added dedicated Line pages for full threads. Added comments on Lines, including image support. Added likes and dislikes for comments. Added optional Line titles. Added experimental HTML Mode for custom styled Lines. Added secure HTML previews with sandboxed iframe rendering. Added inline editing for Lines, including title/content edits, HTML edits, and image replace/remove. Added Edited indicators while keeping feed order chronological.