Add selectable fullscreen orientation and an iPhone landscape overlay

frontend/index.html

@@ -35,6 +35,7 @@
   <link rel="stylesheet" href="saved-page.css" />
   <link rel="stylesheet" href="theme-glass-controls.css" />
   <link rel="stylesheet" href="theme-glass-panel.css" />
+  <link rel="stylesheet" href="fullscreen-orientation.css" />
   </head>
   <body>
     <div class="app">
@@ -661,6 +662,7 @@
     <script src="p2p-transfer.js"></script>
     <script src="async-guard.js"></script>
     <script src="sw-update.js"></script>
+    <script src="fullscreen-orientation.js"></script>
     <script src="settings-sections.js"></script>
     <script src="direct-protocol.js"></script>
     <script src="direct-stream.js"></script>