adding redirection if user already has a staff

apps/mobile/packages/features/staff/authentication/lib/src/presentation/pages/phone_verification_page.dart

@@ -108,12 +108,19 @@ class _PhoneVerificationPageState extends State<PhoneVerificationPage> {
                   state.mode == AuthMode.signup) {
                 final String message = state.errorMessage ?? '';
                 if (message.contains('staff profile')) {
-                  Modular.to.pushReplacementNamed(
-                    './phone-verification',
-                    arguments: <String, String>{
-                      'mode': AuthMode.login.name,
-                    },
+                  final ScaffoldMessengerState messenger =
+                      ScaffoldMessenger.of(context);
+                  messenger.hideCurrentSnackBar();
+                  messenger.showSnackBar(
+                    SnackBar(
+                      content: Text(message),
+                      duration: const Duration(seconds: 5),
+                    ),
                   );
+                  Future<void>.delayed(const Duration(seconds: 5), () {
+                    if (!mounted) return;
+                    Modular.to.navigate('/');
+                  });
                 } else if (message.contains('not authorized')) {
                   Modular.to.pop();
                 }