chore: Follow up settings page design

lib/pages/settings/settings_view.dart

@@ -19,6 +19,7 @@ class SettingsView extends StatelessWidget {
 
   @override
   Widget build(BuildContext context) {
+    final showChatBackupBanner = controller.showChatBackupBanner;
     return Scaffold(
       appBar: AppBar(
         leading: CloseButton(
@@ -132,13 +133,20 @@ class SettingsView extends StatelessWidget {
                   );
                 }),
             const Divider(thickness: 1),
-            SwitchListTile.adaptive(
-              controlAffinity: ListTileControlAffinity.trailing,
-              value: controller.showChatBackupBanner == false,
-              secondary: const Icon(Icons.backup_outlined),
-              title: Text(L10n.of(context)!.chatBackup),
-              onChanged: controller.firstRunBootstrapAction,
-            ),
+            if (showChatBackupBanner == null)
+              ListTile(
+                leading: const Icon(Icons.backup_outlined),
+                title: Text(L10n.of(context)!.chatBackup),
+                trailing: const CircularProgressIndicator.adaptive(),
+              )
+            else
+              SwitchListTile.adaptive(
+                controlAffinity: ListTileControlAffinity.trailing,
+                value: controller.showChatBackupBanner == false,
+                secondary: const Icon(Icons.backup_outlined),
+                title: Text(L10n.of(context)!.chatBackup),
+                onChanged: controller.firstRunBootstrapAction,
+              ),
             const Divider(thickness: 1),
             ListTile(
               leading: const Icon(Icons.format_paint_outlined),