修复用户登录功能

XplorePlane/App.xaml

@@ -1,7 +1,8 @@
 <Application x:Class="XplorePlane.App"
              xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-             xmlns:converters="clr-namespace:XplorePlane.Converters">
+             xmlns:converters="clr-namespace:XplorePlane.Converters"
+             ShutdownMode="OnMainWindowClose">
     <Application.Resources>
         <ResourceDictionary>
             <ResourceDictionary.MergedDictionaries>

XplorePlane/App.xaml.cs

@@ -349,6 +349,10 @@ namespace XplorePlane
             //}
 
             // ── 登录认证：在显示主窗口前弹出登录对话框 ──
+            // 临时切换 ShutdownMode，防止 LoginDialog 关闭时 WPF 自动退出应用
+            var previousShutdownMode = Application.Current.ShutdownMode;
+            Application.Current.ShutdownMode = ShutdownMode.OnExplicitShutdown;
+
             var loginViewModel = Container.Resolve<LoginDialogViewModel>();
             var loginDialog = new LoginDialog(loginViewModel);
             var loginResult = loginDialog.ShowDialog();
@@ -364,6 +368,9 @@ namespace XplorePlane
             Log.Information("登录认证成功，角色: {Role}",
                 Container.Resolve<IPermissionService>().CurrentRole);
 
+            // 恢复 ShutdownMode，让主窗口关闭时正常退出
+            Application.Current.ShutdownMode = ShutdownMode.OnMainWindowClose;
+
             var shell = Container.Resolve<MainWindow>();
 
             // 主窗体加载完成后再连接相机，确保所有模块和原生 DLL 已完成初始化