Approximately rough in persistent chat column very roughly
Summary:
Ref T7014. This is very rough and not hooked up to anything, but gets a couple of the layout pieces in place so we can (a) see that it looks like it'll kinda work; (b) look for problematic interactions and (c) you can fix my mangling of your design.
NOTE: Press "\" to toggle the column.
Test Plan:
Feels pretty good to me?
Reviewers: btrahan, chad
Reviewed By: chad
Subscribers: epriestley
Maniphest Tasks: T7014
Differential Revision: https://secure.phabricator.com/D11497