refactor entire frontend

frontend/lib/main.dart

@@ -1,43 +1,46 @@
 import 'dart:html' as html;
 import 'dart:io' as io;
 import 'package:flutter/material.dart';
-import 'chat_screen.dart';
 import 'backend.dart';
+import 'user_checker.dart';
 
 class Config {
   static String? backendUrl; // Declare it as nullable
 
   static void loadConfig() {
-    // Check the platform for web or other
     if (html.window.location.origin.isNotEmpty) {
       // For web applications
       backendUrl = html.window.location.origin; // Get the server URL from window.location
-    } else if (io.Platform.environment.containsKey('BACKEND_URL')) {
-      // For Android or other platforms, check for the environment variable
+    }
+
+    // For Android or other platforms, check for the environment variable
+    /*if (io.Platform.environment.containsKey('BACKEND_URL')) {
       backendUrl = io.Platform.environment['BACKEND_URL'];
+    } else if (html.window.location.origin.isNotEmpty) {
+      // For web applications
+      backendUrl = html.window.location.origin; // Get the server URL from window.location
     } else {
       // If no value is determined, set it to null
       backendUrl = null;
-    }
+    }*/
   }
 }
 
 void main() {
+  print("Main");
   Config.loadConfig(); // Load the configuration before running the app
 
   Backend.setup('${Config.backendUrl}/ws');
-  runApp(const MyApp());
+  runApp(HubApp());
 }
 
-class MyApp extends StatelessWidget {
-  const MyApp({super.key});
-
+class HubApp extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
-      title: 'Flutter Chat',
+      title: 'Horde Hub',
       theme: ThemeData.dark(),
-      home: const ChatScreen(),
+      home: UserChecker(),
     );
   }
 }