Fix: Frontend did not use the Visual Studio Theme

Author: loop8ack

src/ExtensionManager.UI/UIMarkupServices.cs

@@ -0,0 +1,16 @@
+using System;
+
+using ExtensionManager.UI.Attached;
+using ExtensionManager.VisualStudio.Themes;
+
+using Microsoft.Extensions.DependencyInjection;
+
+namespace ExtensionManager.UI;
+
+public static class UIMarkupServices
+{
+    public static void Initialize(IServiceProvider services)
+    {
+        VSTheme.Initialize(services.GetRequiredService<IVSThemes>());
+    }
+}

src/ExtensionManager.Vsix.Shared/ExtensionManagerPackage.cs

@@ -11,6 +11,7 @@
 
 using ExtensionManager.Features.Export;
 using ExtensionManager.Features.Install;
+using ExtensionManager.UI;
 using ExtensionManager.VisualStudio;
 using ExtensionManager.VisualStudio.Solution;
 
@@ -45,6 +46,8 @@ protected override async Task InitializeAsync(CancellationToken cancellationToke
             .ConfigureExtensionManager(new ThisVsixInfo())
             .BuildServiceProvider();
 
+        UIMarkupServices.Initialize(services);
+
         var solutions = services.GetRequiredService<IVSSolutions>();
         var featureExecutor = services.GetRequiredService<IFeatureExecutor>();