fix: Incorrect type casting occurs when an insufficient number of cha…

…racters entered to password field on the registration page.

designer_v2/lib/features/auth/auth_form_controller.dart

@@ -105,7 +105,7 @@ class AuthFormController extends _$AuthFormController
     ValidationMessage.email: (_) => tr.form_field_email_invalid,
     ValidationMessage.mustMatch: (_) => tr.form_field_password_mustmatch,
     ValidationMessage.minLength: (error) => tr.form_field_password_minlength(
-          (error as Map)['requiredLength'] as String,
+          (error as Map)['requiredLength'].toString(),
         ),
   };