feat: Enhance messaging read receipts and auto-read, fix auth 401 error suppression during logout, and refine agent profile expertise

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

@@ -97,6 +97,8 @@ class AuthNotifier extends StateNotifier<AuthState> {
 
     try {
       final user = await _repository.getMe();
+      // Re-enable auth error handling after successful login
+      ApiClient.suppressAuthErrors = false;
       state = state.copyWith(
         status: AuthStatus.authenticated,
         user: user,
@@ -113,6 +115,8 @@ class AuthNotifier extends StateNotifier<AuthState> {
   }
 
   Future<void> logout() async {
+    // Suppress 401 errors during logout to prevent SnackBar flashing
+    ApiClient.suppressAuthErrors = true;
     // Reset state first so UI navigates to login immediately
     state = const AuthState();
     // Disconnect socket immediately
@@ -151,6 +155,7 @@ class AuthNotifier extends StateNotifier<AuthState> {
         return;
       }
 
+      ApiClient.suppressAuthErrors = false;
       state = state.copyWith(
         status: AuthStatus.authenticated,
         user: result['user'] as UserModel,