edit: Also, the extra space in comment-headers is wonky. And even with my nitpicking, great job!
Also that makes the URLs work as an Inbox/Unread badge for me. With what I can see as the unread ones I need to read before the end of day.
Will tweak it a bit though. Also different screens with different color gamut make it troublesome in corner cases.
edit: The comments whitespace treatment is next in line on by issue list.