UI threading work

Hyperbar.Windows/Lifecycles/AppConfiguration.cs

@@ -0,0 +1,8 @@
+using Hyperbar.Windows.Controls;
+
+namespace Hyperbar.Windows;
+
+public class AppConfiguration
+{
+    public DesktopFlyoutPlacement Placement { get; set; }
+}

Hyperbar.Windows/Lifecycles/AppInitializer.cs

@@ -5,14 +5,15 @@ namespace Hyperbar.Windows;
 
 public class AppInitializer([FromKeyedServices(nameof(WidgetBarViewModel))] WidgetBarView view,
     [FromKeyedServices(nameof(WidgetBarViewModel))] WidgetBarViewModel viewModel,
-    DesktopFlyout desktopFlyout) :
+    DesktopFlyout desktopFlyout, 
+    AppConfiguration configuration) :
     IInitializer
 {
     public Task InitializeAsync()
     {
         view.DataContext = viewModel;
 
-        desktopFlyout.Placement = DesktopFlyoutPlacement.Top;
+        desktopFlyout.Placement = configuration.Placement;
         desktopFlyout.Content = view;
 
         return Task.CompletedTask;

Hyperbar.Windows/Lifecycles/ConfigurationChangedHandler.cs

@@ -0,0 +1,14 @@
+using Hyperbar.Windows.Controls;
+
+namespace Hyperbar.Windows.Primary;
+
+public class AppConfigurationChangedHandler(DesktopFlyout desktopFlyout,
+    AppConfiguration configuration) :
+    INotificationHandler<ConfigurationChanged<AppConfiguration>>
+{
+    public ValueTask Handle(ConfigurationChanged<AppConfiguration> notification, CancellationToken cancellationToken)
+    {
+        desktopFlyout.Placement = configuration.Placement;
+        return ValueTask.CompletedTask;
+    }
+}