React to Aphlict disconnects in the UI
Summary: Ref T5365. Surface disconnects in the UI.
Test Plan:
- Connected, then killed the server.
- Saw disconnected event and appropriate update in the UI.
{F169605}
Reviewers: joshuaspence
Reviewed By: joshuaspence
Subscribers: epriestley
Maniphest Tasks: T5365
Differential Revision: https://secure.phabricator.com/D9706