Remove italic styling on the replies text
Make the replies toggle red when hovering the thread

This makes it consistent with the annotation timestamp. The next step
is to make all actions focus when the card is hovered.
Make the quote italic to break up the card text

This was part of an earlier card refactor but was put aside until we'd
tested it with the text diffs. These have been removed for the moment
so it seems like a good time to try this style out.
Add spacing between child thread and replies toggle
Add annotator card to the pattern library

This is only a couple of very basic variants but it helps with catching
basic layout issues.
Merge pull request #1497 from hypothesis/view-sort-tweaks

Small style tweaks to the view-sort-overhaul branch