Cut over the window to Explorer.Host.exe so only the host writes the index.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/Explorer.App/App.xaml.cs

@@ -1,5 +1,7 @@
 using System.IO;
 using System.Windows;
+using Explorer.Hosting;
+using Explorer.Hosting.Ipc;
 using Explorer.Presentation.ViewModels;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
@@ -10,6 +12,7 @@ namespace Explorer.App;
 public partial class App : System.Windows.Application
 {
     private IHost? _host;
+    private WorkbenchPipeClient? _workbenchClient;
 
     protected override async void OnStartup(StartupEventArgs e)
     {
@@ -29,9 +32,35 @@ public partial class App : System.Windows.Application
                 retainedFileCountLimit: 14)
             .CreateLogger();
 
+        _workbenchClient = await WorkbenchHostConnector.ConnectOrStartAsync(
+            TimeSpan.FromSeconds(12),
+            logger: null).ConfigureAwait(true);
+        var hostExe = HostLogonAutostart.FindHostExecutable();
+        if (_workbenchClient is null && hostExe is not null)
+        {
+            MessageBox.Show(
+                "Explorer.Host.exe is present but the window could not connect to it. See logs.",
+                "Explorer Workbench",
+                MessageBoxButton.OK,
+                MessageBoxImage.Error);
+            Shutdown(-1);
+            return;
+        }
+
         _host = Host.CreateDefaultBuilder()
             .UseSerilog()
-            .ConfigureServices((_, services) => services.AddExplorer())
+            .ConfigureServices((_, services) =>
+            {
+                if (_workbenchClient is not null)
+                {
+                    services.AddExplorerClient(_workbenchClient);
+                    services.AddExplorerUi();
+                }
+                else
+                {
+                    services.AddExplorer();
+                }
+            })
             .Build();
 
         var vm = _host.Services.GetRequiredService<MainViewModel>();
@@ -60,6 +89,11 @@ public partial class App : System.Windows.Application
             _host.Dispose();
         }
 
+        if (_workbenchClient is not null)
+        {
+            await _workbenchClient.DisposeAsync().ConfigureAwait(true);
+        }
+
         Log.CloseAndFlush();
         base.OnExit(e);
     }