Add download controls and device storage breakdown

frontend/index.html

@@ -654,6 +654,7 @@
     <script src="async-guard.js"></script>
     <script src="sw-update.js"></script>
     <script src="settings-sections.js"></script>
+    <script src="downloads.js"></script>
     <script src="app.js"></script>
   </body>
 </html>