feat: show unread Updates on app icon (Closes #1278)

frontend/index.html

@@ -133,6 +133,10 @@
         <div><strong>Notify me about new updates</strong><p class="small" id="device-setup-push-status" role="status"></p></div>
         <button class="device-setup-action" id="device-setup-push" type="button">Enable</button>
       </li>
+      <li class="device-setup-step" id="device-setup-app-badge-step">
+        <div><strong>Show unread Updates on the app icon</strong><p class="small" id="device-setup-app-badge-status" role="status"></p></div>
+        <button class="device-setup-action" id="device-setup-app-badge" type="button">Enable</button>
+      </li>
       <li class="device-setup-step">
         <div><strong>Remind me about deadlines</strong><p class="small" id="device-setup-deadline-status" role="status"></p></div>
         <div class="device-setup-deadline-controls">
@@ -210,6 +214,10 @@
           <div class="offline-work-controls">
             <label for="keep-work-offline"><input id="keep-work-offline" type="checkbox" /> Keep My Work available offline</label>
             <label for="delivery-receipts"><input id="delivery-receipts" type="checkbox" /> Notify me when queued work finishes</label>
+            <span class="app-badge-setting" id="app-badge-setting">
+              <label class="app-badge-control" for="app-badge-control"><input id="app-badge-control" type="checkbox" /> Show unread Updates on the app icon</label>
+              <span class="small" id="app-badge-status" role="status" aria-live="polite"></span>
+            </span>
             <label class="push-update-control" for="push-updates"><input id="push-updates" type="checkbox" /> Notify me about new updates</label>
             <span class="small" id="push-update-status" role="status" aria-live="polite"></span>
             <button class="secondary" id="push-test" type="button" hidden>Send test notification</button>
@@ -2173,6 +2181,7 @@
 <script src="static/mobile-launch.js"></script>
 <script src="static/mobile-insights.js"></script>
 <script src="static/mobile-app-shortcuts.js"></script>
+<script src="static/mobile-app-badge.js"></script>
 <script src="static/install-app.js"></script>
 <script src="static/private-device-data.js"></script>
 <script src="static/device-storage.js"></script>