Fix some edge cases

Bitvault/ItemHeaderViewModel.cs

@@ -1,4 +1,5 @@
-using Toolkit.Foundation;
+using CommunityToolkit.Mvvm.ComponentModel;
+using Toolkit.Foundation;
 
 namespace Bitvault;
 
@@ -8,10 +9,13 @@ public partial class ItemHeaderViewModel(IServiceProvider provider,
     IPublisher publisher,
     ISubscriber subscriber,
     IDisposer disposer,
+    bool immutable,
     string? value = null) : ObservableViewModel<string, string>(provider, factory, mediator, publisher, subscriber, disposer, value),
     IItemViewModel
 {
+    [ObservableProperty]
+    private bool immutable = immutable;
+
     public void Invoke(ItemConfiguration args) => 
         args.Name = Value;
-
 }