feat: Implement support chat functionality, add 2FA verification screen and routing, and update dependencies.

lib/features/auth/presentation/providers/auth_provider.dart

@@ -16,6 +16,9 @@ class AuthState {
   final String? errorMessage;
   final List<FieldError> fieldErrors;
   final String registeredEmail;
+  final bool requiresTwoFactor;
+  final String? tempToken;
+  final String? twoFactorEmail;
 
   const AuthState({
     this.status = AuthStatus.initial,
@@ -23,6 +26,9 @@ class AuthState {
     this.errorMessage,
     this.fieldErrors = const [],
     this.registeredEmail = '',
+    this.requiresTwoFactor = false,
+    this.tempToken,
+    this.twoFactorEmail,
   });
 
   AuthState copyWith({
@@ -31,6 +37,9 @@ class AuthState {
     String? errorMessage,
     List<FieldError>? fieldErrors,
     String? registeredEmail,
+    bool? requiresTwoFactor,
+    String? tempToken,
+    String? twoFactorEmail,
   }) {
     return AuthState(
       status: status ?? this.status,
@@ -38,6 +47,9 @@ class AuthState {
       errorMessage: errorMessage,
       fieldErrors: fieldErrors ?? this.fieldErrors,
       registeredEmail: registeredEmail ?? this.registeredEmail,
+      requiresTwoFactor: requiresTwoFactor ?? this.requiresTwoFactor,
+      tempToken: tempToken ?? this.tempToken,
+      twoFactorEmail: twoFactorEmail ?? this.twoFactorEmail,
     );
   }
 
@@ -112,8 +124,10 @@ class AuthNotifier extends StateNotifier<AuthState> {
 
       if (result['requiresTwoFactor'] == true) {
         state = state.copyWith(
-          status: AuthStatus.error,
-          errorMessage: '2FA verification required',
+          status: AuthStatus.initial,
+          requiresTwoFactor: true,
+          tempToken: result['tempToken'] as String?,
+          twoFactorEmail: email,
         );
         return;
       }
@@ -189,6 +203,74 @@ class AuthNotifier extends StateNotifier<AuthState> {
     }
   }
 
+  Future<void> verifyTwoFactor(String token) async {
+    final tempToken = state.tempToken;
+    if (tempToken == null) return;
+
+    state = state.copyWith(
+      status: AuthStatus.loading,
+      errorMessage: null,
+    );
+
+    try {
+      final authResponse = await _repository.verifyTwoFactor(
+        tempToken: tempToken,
+        token: token,
+      );
+      state = AuthState(
+        status: AuthStatus.authenticated,
+        user: authResponse.user,
+      );
+      _initPushNotifications();
+    } on ApiException catch (e) {
+      state = state.copyWith(
+        status: AuthStatus.initial,
+        errorMessage: e.message,
+      );
+    } catch (e) {
+      state = state.copyWith(
+        status: AuthStatus.initial,
+        errorMessage: 'Verification failed. Please try again.',
+      );
+    }
+  }
+
+  Future<void> verifyBackupCode(String backupCode) async {
+    final tempToken = state.tempToken;
+    if (tempToken == null) return;
+
+    state = state.copyWith(
+      status: AuthStatus.loading,
+      errorMessage: null,
+    );
+
+    try {
+      final authResponse = await _repository.verifyBackupCode(
+        tempToken: tempToken,
+        backupCode: backupCode,
+      );
+      state = AuthState(
+        status: AuthStatus.authenticated,
+        user: authResponse.user,
+      );
+      _initPushNotifications();
+    } on ApiException catch (e) {
+      state = state.copyWith(
+        status: AuthStatus.initial,
+        errorMessage: e.message,
+      );
+    } catch (e) {
+      state = state.copyWith(
+        status: AuthStatus.initial,
+        errorMessage: 'Verification failed. Please try again.',
+      );
+    }
+  }
+
+  void clearTwoFactor() {
+    state = const AuthState();
+  }
+
   void _initPushNotifications() {
     final push = PushNotificationService();
     push.initialize().then((_) => push.registerAfterLogin());