优化更新代码，添加界面功能并整合

WPFluent/Appearance/SystemTheme.cs

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+
+
+
+namespace WPFluent.Appearance;
+
+/// <summary>
+/// Windows 11 themes.
+/// </summary>
+public enum SystemTheme
+{
+    /// <summary>
+    /// Unknown Windows theme.
+    /// </summary>
+    Unknown,
+
+    /// <summary>
+    /// Custom Windows theme.
+    /// </summary>
+    Custom,
+
+    /// <summary>
+    /// Default light theme.
+    /// </summary>
+    Light,
+
+    /// <summary>
+    /// Default dark theme.
+    /// </summary>
+    Dark,
+
+    /// <summary>
+    /// High-contrast theme: Desert
+    /// </summary>
+    HCWhite,
+
+    /// <summary>
+    /// High-contrast theme: Acquatic
+    /// </summary>
+    HCBlack,
+
+    /// <summary>
+    /// High-contrast theme: Dusk
+    /// </summary>
+    HC1,
+
+    /// <summary>
+    /// High-contrast theme: Nightsky
+    /// </summary>
+    HC2,
+
+    /// <summary>
+    /// Dark theme: Glow
+    /// </summary>
+    Glow,
+
+    /// <summary>
+    /// Dark theme: Captured Motion
+    /// </summary>
+    CapturedMotion,
+
+    /// <summary>
+    /// Light theme: Sunrise
+    /// </summary>
+    Sunrise,
+
+    /// <summary>
+    /// Light theme: Flow
+    /// </summary>
+    Flow,
+}