更新客户端渲染，更新了壳

参考/wpfui-main/samples/Wpf.Ui.Demo.SetResources.Simple/App.xaml.cs

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+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file, You can obtain one at https://opensource.org/licenses/MIT.
+// Copyright (C) Leszek Pomianowski and WPF UI Contributors.
+// All Rights Reserved.
+
+using System.Windows;
+using Wpf.Ui.Appearance;
+using Wpf.Ui.Markup;
+
+namespace Wpf.Ui.Demo.SetResources.Simple;
+
+/// <summary>
+/// Interaction logic for App.xaml
+/// </summary>
+public partial class App
+{
+    public static readonly ThemesDictionary ThemesDictionary = new();
+    public static readonly ControlsDictionary ControlsDictionary = new();
+
+    public static void Apply(ApplicationTheme theme)
+    {
+        ThemesDictionary.Theme = theme;
+    }
+
+    public static void ApplyTheme(FrameworkElement element)
+    {
+        element.Resources.MergedDictionaries.Add(ThemesDictionary);
+        element.Resources.MergedDictionaries.Add(ControlsDictionary);
+    }
+}