feat: resume mobile Updates triage (Closes #747)

frontend/index.html

@@ -749,8 +749,9 @@
         <div class="small" id="update-sheet-key"></div>
         <h3 id="update-sheet-title">Unread update</h3>
       </div>
-      <button id="keep-update-unread" type="button">Keep unread</button>
+      <button id="keep-update-unread" type="button">Keep unread &amp; next</button>
     </div>
+    <div id="update-triage-progress" class="update-triage-progress small" aria-live="polite" hidden></div>
     <div id="update-sheet-status" class="small" aria-live="polite">Choose an update.</div>
     <button class="update-retry" id="retry-update-load" type="button" hidden>Retry loading update</button>
     <div class="row">
@@ -1071,6 +1072,7 @@
 <script src="static/mobile-task-dock.js"></script>
 <script src="static/mobile-work-entry.js"></script>
 <script src="static/mobile-queue-launcher.js"></script>
+<script src="static/update-triage-session.js"></script>
 <script src="static/agenda-session-launcher.js"></script>
 <script src="static/mobile-launch.js"></script>
 <script src="static/mobile-app-shortcuts.js"></script>