fix(ui): 处理桌面组合禁用时的主题应用异常 #2678

当系统桌面组合功能被禁用时，应用 Mica/Acrylic 主题会抛出 COM 异常（HRESULT: 0x80263001）。现通过异常捕获机制，在检测到此特定错误时回退到纯色背景方案，确保程序在受限环境下仍能正常运行。

- 在 ApplyThemeToWindow 方法中添加异常处理逻辑
- 引入 ApplyFallbackTheme 方法应用纯色后备主题
- 根据主题类型提供对应的后备背景色

BetterGenshinImpact/Helpers/Ui/WindowHelper.cs

@@ -1,4 +1,6 @@
-using System.Diagnostics;
+using System;
+using System.Diagnostics;
+using System.Runtime.InteropServices;
 using System.Windows.Media;
 using BetterGenshinImpact.Core.Config;
 using BetterGenshinImpact.GameTask;
@@ -9,6 +11,8 @@ namespace BetterGenshinImpact.Helpers.Ui;
 
 public class WindowHelper
 {
+    private const uint DesktopCompositionDisabledHResult = 0x80263001;
+
     public static void TryApplySystemBackdrop(System.Windows.Window window)
     {
         var themeType = TaskContext.Instance().Config.CommonConfig.CurrentThemeType;
@@ -37,6 +41,22 @@ public class WindowHelper
     /// <param name="window">要应用主题的窗口</param>
     /// <param name="themeType">主题类型</param>
     public static void ApplyThemeToWindow(System.Windows.Window window, ThemeType themeType)
+    {
+        try
+        {
+            ApplyThemeCore(window, themeType);
+        }
+        catch (COMException ex) when ((uint)ex.HResult == DesktopCompositionDisabledHResult)
+        {
+            ApplyFallbackTheme(window, themeType);
+        }
+        catch
+        {
+            ApplyFallbackTheme(window, themeType);
+        }
+    }
+
+    private static void ApplyThemeCore(System.Windows.Window window, ThemeType themeType)
     {
         switch (themeType)
         {
@@ -76,4 +96,21 @@ public class WindowHelper
                 break;
         }
     }
-}
+
+    private static void ApplyFallbackTheme(System.Windows.Window window, ThemeType themeType)
+    {
+        window.Background = new SolidColorBrush(GetFallbackBackgroundColor(themeType));
+        WindowBackdrop.ApplyBackdrop(window, WindowBackdropType.None);
+    }
+
+    private static Color GetFallbackBackgroundColor(ThemeType themeType)
+    {
+        return themeType switch
+        {
+            ThemeType.LightNone => Color.FromArgb(255, 243, 243, 243),
+            ThemeType.LightMica => Color.FromArgb(255, 243, 243, 243),
+            ThemeType.LightAcrylic => Color.FromArgb(255, 243, 243, 243),
+            _ => Color.FromArgb(255, 32, 32, 32)
+        };
+    }
+}