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

src/applications/notification/view/PhabricatorNotificationStatusView.php

@@ -23,6 +23,8 @@ final class PhabricatorNotificationStatusView extends AphrontTagView {
           'error.flash.xdomain' => pht(
             'Unable to connect to Flash Policy Server. Check that the '.
             'notification server is running and port 843 is not firewalled.'),
+          'error.flash.disconnected' => pht(
+            'Disconnected from notification server.'),
         ),
       ));
 

support/aphlict/client/src/AphlictMaster.as

@@ -145,7 +145,7 @@ package {
     }
 
     private function didCloseSocket(event:Event):void {
-      this.externalInvoke('close');
+      this.setStatusOnClients('error', 'error.flash.disconnected');
     }
 
     private function didIOErrorSocket(event:IOErrorEvent):void {