Gradient picker button - Always update gradient on UI thread

Data bindings - Added AlwaysApplyDataBindings setting

src/Artemis.UI.Shared/Controls/GradientPicker/GradientPickerButton.cs

@@ -10,6 +10,7 @@ using Avalonia.Controls.Primitives;
 using Avalonia.Data;
 using Avalonia.Interactivity;
 using Avalonia.Media;
+using Avalonia.Threading;
 using FluentAvalonia.Core;
 using Button = FluentAvalonia.UI.Controls.Button;
 
@@ -138,12 +139,12 @@ public class GradientPickerButton : TemplatedControl
 
     private void ColorGradientOnCollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
     {
-        UpdateGradient();
+        Dispatcher.UIThread.Post(UpdateGradient);
     }
 
     private void ColorGradientOnStopChanged(object? sender, EventArgs e)
     {
-        UpdateGradient();
+        Dispatcher.UIThread.Post(UpdateGradient);
     }
 
     private void OnButtonClick(object? sender, RoutedEventArgs e)