All links by default had an underline on hover, including when
<a> tags were wrapping <div> and <img> tags, which made for a small
underline near them on hover. This better focusses the underline
behavior to just paragraphs and lists.
This creates a dropdown in place of the normal register/login links
you get when logged out, with an option to go to the app or log out if
that appears you click on the avatar.
A bit more work is needed to make this look really good, but it's a
great start.