refactor: Only preload client for GUI start

lib/main.dart

@@ -22,11 +22,6 @@ void main() async {
   Logs().nativeColors = !PlatformInfos.isIOS;
   final clients = await ClientManager.getClients();
 
-  // Preload first client
-  final firstClient = clients.firstOrNull;
-  await firstClient?.roomsLoading;
-  await firstClient?.accountDataLoading;
-
   // If the app starts in detached mode, we assume that it is in
   // background fetch mode for processing push notifications. This is
   // currently only supported on Android.
@@ -63,6 +58,11 @@ Future<void> startGui(List<Client> clients) async {
     }
   }
 
+  // Preload first client
+  final firstClient = clients.firstOrNull;
+  await firstClient?.roomsLoading;
+  await firstClient?.accountDataLoading;
+
   runApp(FluffyChatApp(clients: clients, pincode: pin));
 }