chore: Minor tidy up

samples/Playground/Playground/App.xaml.cs

@@ -1,6 +1,8 @@
 namespace Playground;
 public partial class App : Application
 {
+    private IHost? _host;
+    
     /// <summary>
     /// Initializes the singleton application object. This is the first line of authored code
     /// executed, and as such is the logical equivalent of main() or WinMain().

samples/Playground/Playground/DebugHttpHandler.cs

@@ -1,10 +1,5 @@
 namespace Playground;
 
-public partial class App : Application
-{
-	private IHost? _host;
-}
-
 public class DebugHttpHandler : DelegatingHandler
 {
 	public DebugHttpHandler(HttpMessageHandler? innerHandler = null)