fix: combine member list screen and user list screen

lib/main.dart

@@ -2,14 +2,13 @@ import 'package:flutter/material.dart';
 import 'package:flutter/gestures.dart';
 
 import 'package:google_fonts/google_fonts.dart';
-import 'package:library_app/src/screens/admin_list_screen.dart';
 import 'package:provider/provider.dart';
 import 'package:library_app/src/providers/auth_provider.dart';
 import 'package:library_app/src/providers/navigations_provider.dart';
 import 'package:library_app/src/providers/book_provider.dart';
 
 import 'package:library_app/src/screens/form_screen.dart';
-import 'package:library_app/src/screens/list_screen.dart';
+import 'package:library_app/src/screens/list/list_screen.dart';
 
 void main() {
   runApp(const LibraryApp());
@@ -44,14 +43,9 @@ class _LibraryApp extends State<LibraryApp> {
         ),
         home: Consumer<AuthProvider>(
           builder: (context, authProvider, child) {
-            final user = authProvider.user;
             final isAuthenticated = authProvider.isAuthenticated;
 
-            return isAuthenticated
-                ? user != null && user.isStaff
-                    ? const AdminListScreen()
-                    : const ListScreen()
-                : const LoginScreen();
+            return isAuthenticated ? const ListScreen() : const LoginScreen();
           },
         ),
         scrollBehavior: AdaptiveScrollBehavior(),

lib/src/providers/auth_provider.dart

@@ -39,12 +39,19 @@ class AuthProvider with ChangeNotifier {
     String? token = await getAccessToken();
     bool isValid = token != null;
 
-    if (isValid) {
-      isAuthenticated = true;
+    if (!isValid) {
+      isAuthenticated = false;
     }
+
+    isAuthenticated = true;
   }
 
   Future<void> signIn(String username, String password) async {
+    final token = await getAccessToken();
+    if (token != null) {
+      validateToken();
+    }
+
     try {
       final response = await http.post(
         Uri.parse('$baseUrl/auth/login'),
@@ -56,11 +63,6 @@ class AuthProvider with ChangeNotifier {
         final data = jsonDecode(response.body);
         await storeAccessToken(Token.fromJson(data)!.key);
 
-        final token = await getAccessToken();
-        if (token != null) {
-          validateToken();
-        }
-
         invalidUsernameOrPassword = false;
         debugPrint("Login successful $token");
       } else if (response.statusCode == 401) {

lib/src/screens/list/list_screen.dart

+import 'package:flutter/material.dart';
+import 'package:library_app/src/providers/auth_provider.dart';
+import 'package:library_app/src/screens/list/admin_list_screen.dart';
+import 'package:library_app/src/screens/list/member_list_screen.dart';
+import 'package:provider/provider.dart';
+
+class ListScreen extends StatelessWidget {
+  const ListScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final user = Provider.of<AuthProvider>(context).user;
+    if (user != null && user.isStaff) {
+      return const AdminListScreen();
+    }
+
+    return const MemberListScreen();
+  }
+}

lib/src/screens/list_screen.dart → lib/src/screens/list/member_list_screen.dart

@@ -10,14 +10,14 @@ import 'package:library_app/src/widgets/loans/loan_list.dart';
 import 'package:library_app/src/widgets/profile.dart';
 import 'package:provider/provider.dart';
 
-class ListScreen extends StatefulWidget {
-  const ListScreen({super.key});
+class MemberListScreen extends StatefulWidget {
+  const MemberListScreen({super.key});
 
   @override
-  State<ListScreen> createState() => _ListScreen();
+  State<MemberListScreen> createState() => _MemberListScreen();
 }
 
-class _ListScreen extends State<ListScreen> {
+class _MemberListScreen extends State<MemberListScreen> {
   @override
   void initState() {
     super.initState();