Medistor reworked to handle ui threading in a cleaner way

Hyperbar.Windows/Lifecycles/KeyAcceleratorHandler.cs

@@ -0,0 +1,14 @@
+using Hyperbar.Windows.Interop;
+
+namespace Hyperbar.Windows;
+
+public class KeyAcceleratorHandler(IVirtualKeyboard virtualKeyboard) :
+    IHandler<KeyAccelerator>
+{
+    public Task<Unit> Handle(KeyAccelerator request,
+        CancellationToken cancellationToken)
+    {
+        virtualKeyboard.Send((int)request.Key, request.Modifiers?.Select(modifier => (int)modifier).ToArray() ?? []);
+        return Task.FromResult<Unit>(default);
+    }
+}