feat: add icons to all message box dialogs for better UX

Author: claude

Dialogs/ViewModels/AboutViewModel.cs

@@ -11,7 +11,8 @@ namespace ProxyChecker.Dialogs.ViewModels;
 public partial class AboutViewModel(UpdateService updateService) : ObservableObject
 {
     [ObservableProperty] private string _appVersion = VersionInfo.GetDisplayVersion();
-    [ObservableProperty] private string _description =
+    [ObservableProperty]
+    private string _description =
         "ProxyChecker 是一个高性能的代理检测工具，支持多协议检测、地理位置识别及并发验证。\n\n基于 Avalonia UI 与 Native AOT 技术构建，旨在提供跨平台、极致流畅的用户体验。";
     [ObservableProperty] private bool _isCheckingUpdate;
 
@@ -45,13 +46,13 @@ await OverlayDialog.ShowModal<UpdateDialog, UpdateViewModel>(
             }
             else
             {
-                await MessageBox.ShowOverlayAsync("当前已是最新版本。", "检查更新");
+                await MessageBox.ShowOverlayAsync("当前已是最新版本。", "检查更新", icon: MessageBoxIcon.Information);
             }
         }
         catch (Exception ex)
         {
             var message = ex.InnerException?.Message ?? ex.Message;
-            await MessageBox.ShowOverlayAsync($"检查更新失败: {message}", "错误");
+            await MessageBox.ShowOverlayAsync($"检查更新失败: {message}", "错误", icon: MessageBoxIcon.Error);
         }
         finally
         {

ViewModels/MainViewModel.cs

@@ -290,7 +290,7 @@ await Drawer.ShowModal<SettingDialog, SettingModel>(
         }
         catch (Exception ex)
         {
-            await MessageBox.ShowOverlayAsync($"打开设置失败: {ex.Message}", "错误");
+            await MessageBox.ShowOverlayAsync($"打开设置失败: {ex.Message}", "错误", icon: MessageBoxIcon.Error);
         }
 
     }
@@ -316,7 +316,7 @@ private async Task LoadFileAsync()
         }
         catch (Exception ex)
         {
-            await MessageBox.ShowOverlayAsync($"打开设置失败: {ex.Message}", "错误");
+            await MessageBox.ShowOverlayAsync($"打开设置失败: {ex.Message}", "错误", icon: MessageBoxIcon.Error);
         }
 
     }

Views/MainWindow.axaml.cs

@@ -155,7 +155,7 @@ protected override async Task<bool> CanClose()
             return true;
         }
 
-        var result = await MessageBox.ShowOverlayAsync("您确定要退出吗？", "退出提示", button: MessageBoxButton.YesNo);
+        var result = await MessageBox.ShowOverlayAsync("您确定要退出吗？", "退出提示", button: MessageBoxButton.YesNo, icon: MessageBoxIcon.Warning);
         return result == MessageBoxResult.Yes;
     }
 }