Enables partial keyword for reactive properties

Uses the `partial` keyword in reactive properties
for enhanced flexibility and extensibility.

Author: Seeker1437

Stellar/ViewModel/SelectionViewModel.cs

@@ -3,16 +3,16 @@
 public partial class SelectionViewModel<TSelectedValKey> : ViewModelBase
 {
     [Reactive]
-    public TSelectedValKey? Key { get; set; }
+    public partial TSelectedValKey? Key { get; set; }
 
     [Reactive]
-    public string? DisplayValue { get; set; }
+    public partial string? DisplayValue { get; set; }
 
     [Reactive]
-    public bool Selected { get; set; }
+    public partial bool Selected { get; set; }
 
     [Reactive]
-    public ReactiveCommand<Unit, bool>? ToggleSelected { get; private set; }
+    public partial ReactiveCommand<Unit, bool>? ToggleSelected { get; private set; }
 
     protected override void Bind(WeakCompositeDisposable disposables)
     {