add check token 25%

covas_mobile/lib/classes/auth_service.dart

@@ -3,6 +3,8 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:http/http.dart' as http;
 import '../variable/globals.dart' as globals;
 import 'dart:io';
+import 'package:flutter/material.dart';
+import '../pages/LoginDemo.dart';
 
 class AuthService {
   // Login with username and password
@@ -86,6 +88,21 @@ class AuthService {
     }
   }
 
+  Future<void> checkTokenStatus(context) async {
+    bool loggedIn = await isLoggedIn();
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+
+    if (!loggedIn) {
+      await prefs.remove("access_token"); // Correctly remove the token
+
+      Navigator.pushAndRemoveUntil(
+        context,
+        MaterialPageRoute(builder: (_) => LoginDemo()),
+        (route) => false, // Remove all previous routes
+      );
+    }
+  }
+
   // Get stored access token
   Future<String?> getAccessToken() async {
     final prefs = await SharedPreferences.getInstance();