- Add file "viewed" checkmarks with progress tracking (X/26 viewed in header + sidebar)
- Add directory-grouped file tree in sidebar with review progress bar
- Add sticky file headers that stay visible when scrolling through long diffs
- Add file change type badges (NEW/DELETED/RENAMED) with colored left borders
- Add syntax highlighting via shiki with lazy loading and progressive enhancement
- Add merge confirmation dropdown showing unresolved comments + viewed progress
- Make Approve & Merge button prominently green, Request Changes styled with error tokens
- Show full branch names instead of aggressively truncated text
- Add always-visible comment dots on lines with comments, subtle hover on others
- Improve hunk headers with two-tone @@ display and context function highlighting
- Add review progress bar to sidebar with file-level viewed state
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