feat: implement launcher orchestrator and startup monitoring infrastructure for host lifecycle management

LanDesktopPLONDS.installer/App.axaml

@@ -1,12 +1,12 @@
 <Application xmlns="https://github.com/avaloniaui"
              xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
              xmlns:theme="using:Avalonia.Themes.Fluent"
-             xmlns:fi="using:FluentIcons.Avalonia"
              x:Class="LanDesktopPLONDS.Installer.App"
              RequestedThemeVariant="Default">
   <Application.Resources>
     <ResourceDictionary>
-      <FontFamily x:Key="AppFontFamily">Inter, Segoe UI, Microsoft YaHei UI</FontFamily>
+      <FontFamily x:Key="AppFontFamily">Segoe UI, Microsoft YaHei UI</FontFamily>
+      <FontFamily x:Key="InstallerIconFontFamily">Segoe MDL2 Assets</FontFamily>
       <CornerRadius x:Key="DesignCornerRadiusMicro">2</CornerRadius>
       <CornerRadius x:Key="DesignCornerRadiusXs">4</CornerRadius>
       <CornerRadius x:Key="DesignCornerRadiusSm">4</CornerRadius>
@@ -76,10 +76,12 @@
     <Style Selector="UserControl">
       <Setter Property="FontFamily" Value="{DynamicResource AppFontFamily}" />
     </Style>
-    <Style Selector="fi|FluentIcon">
+    <Style Selector="TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerTextPrimaryBrush}" />
+      <Setter Property="FontFamily" Value="{DynamicResource InstallerIconFontFamily}" />
       <Setter Property="VerticalAlignment" Value="Center" />
       <Setter Property="HorizontalAlignment" Value="Center" />
+      <Setter Property="TextAlignment" Value="Center" />
     </Style>
     <Style Selector="TextBlock">
       <Setter Property="Foreground" Value="{DynamicResource InstallerTextPrimaryBrush}" />
@@ -142,13 +144,13 @@
       <Setter Property="Background" Value="{DynamicResource InstallerSubtleFillBrush}" />
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
-    <Style Selector="Button.primary-command fi|FluentIcon">
+    <Style Selector="Button.primary-command TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerOnAccentBrush}" />
     </Style>
     <Style Selector="Button.primary-command TextBlock">
       <Setter Property="Foreground" Value="{DynamicResource InstallerOnAccentBrush}" />
     </Style>
-    <Style Selector="Button.primary-command:disabled fi|FluentIcon">
+    <Style Selector="Button.primary-command:disabled TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
     <Style Selector="Button.primary-command:disabled TextBlock">
@@ -174,13 +176,13 @@
     <Style Selector="Button.secondary-command TextBlock">
       <Setter Property="Foreground" Value="{DynamicResource InstallerTextPrimaryBrush}" />
     </Style>
-    <Style Selector="Button.secondary-command fi|FluentIcon">
+    <Style Selector="Button.secondary-command TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerTextPrimaryBrush}" />
     </Style>
     <Style Selector="Button.secondary-command:disabled TextBlock">
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
-    <Style Selector="Button.secondary-command:disabled fi|FluentIcon">
+    <Style Selector="Button.secondary-command:disabled TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
     <Style Selector="TextBox">

LanDesktopPLONDS.installer/InstallerStartupDiagnostics.cs

@@ -0,0 +1,92 @@
+using System.Runtime.InteropServices;
+using System.Text;
+
+namespace LanDesktopPLONDS.Installer;
+
+internal static class InstallerStartupDiagnostics
+{
+    private const uint MessageBoxIconError = 0x00000010;
+    private const uint MessageBoxOk = 0x00000000;
+
+    private static int _initialized;
+    private static int _fatalMessageShown;
+
+    public static string LogPath => Path.Combine(GetLogDirectory(), "startup.log");
+
+    public static void Initialize()
+    {
+        if (Interlocked.Exchange(ref _initialized, 1) != 0)
+        {
+            return;
+        }
+
+        AppDomain.CurrentDomain.UnhandledException += (_, args) =>
+        {
+            var exception = args.ExceptionObject as Exception;
+            ReportFatal("The installer encountered an unhandled startup error.", exception);
+        };
+
+        TaskScheduler.UnobservedTaskException += (_, args) =>
+        {
+            ReportFatal("The installer encountered an unobserved background error.", args.Exception);
+            args.SetObserved();
+        };
+
+        Log("Startup diagnostics initialized.");
+    }
+
+    public static void Log(string message)
+    {
+        try
+        {
+            Directory.CreateDirectory(GetLogDirectory());
+            File.AppendAllText(
+                LogPath,
+                $"[{DateTimeOffset.Now:O}] {message}{Environment.NewLine}",
+                Encoding.UTF8);
+        }
+        catch
+        {
+            // Diagnostics must never become the reason the installer cannot start.
+        }
+    }
+
+    public static void ReportFatal(string message, Exception? exception)
+    {
+        Log(exception is null ? message : $"{message}{Environment.NewLine}{exception}");
+
+        if (!OperatingSystem.IsWindows() || Interlocked.Exchange(ref _fatalMessageShown, 1) != 0)
+        {
+            return;
+        }
+
+        try
+        {
+            var details = exception is null
+                ? message
+                : $"{message}{Environment.NewLine}{Environment.NewLine}{exception.GetType().Name}: {exception.Message}";
+            _ = MessageBox(
+                IntPtr.Zero,
+                $"{details}{Environment.NewLine}{Environment.NewLine}Log: {LogPath}",
+                "LanDesktopPLONDS Installer",
+                MessageBoxOk | MessageBoxIconError);
+        }
+        catch
+        {
+        }
+    }
+
+    private static string GetLogDirectory()
+    {
+        var root = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
+        if (string.IsNullOrWhiteSpace(root))
+        {
+            root = AppContext.BaseDirectory;
+        }
+
+        return Path.Combine(root, "LanMountainDesktop", "Installer", "logs");
+    }
+
+    [DllImport("user32.dll", EntryPoint = "MessageBoxW", CharSet = CharSet.Unicode)]
+    private static extern int MessageBox(IntPtr hWnd, string text, string caption, uint type);
+}

LanDesktopPLONDS.installer/LanDesktopPLONDS.installer.AOT.props

@@ -8,7 +8,14 @@
     <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
     <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
     <OptimizationPreference>Size</OptimizationPreference>
+    <IlcOptimizationPreference>Size</IlcOptimizationPreference>
     <PublishReadyToRun>false</PublishReadyToRun>
+    <DebuggerSupport>false</DebuggerSupport>
+    <EventSourceSupport>false</EventSourceSupport>
+    <HttpActivityPropagationSupport>false</HttpActivityPropagationSupport>
+    <InvariantGlobalization>true</InvariantGlobalization>
+    <MetadataUpdaterSupport>false</MetadataUpdaterSupport>
+    <UseSystemResourceKeys>true</UseSystemResourceKeys>
   </PropertyGroup>
 
   <PropertyGroup>
@@ -16,24 +23,11 @@
     <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(PublishAot)' == 'true'">
-    <TrimmerRootAssembly Include="Avalonia" />
-    <TrimmerRootAssembly Include="Avalonia.Desktop" />
-    <TrimmerRootAssembly Include="Avalonia.Themes.Fluent" />
-    <TrimmerRootAssembly Include="FluentIcons.Avalonia" />
-    <TrimmerRootAssembly Include="LanDesktopPLONDS.installer" />
-    <TrimmerRootAssembly Include="System.Text.Json" />
-  </ItemGroup>
-
   <Target
     Name="PrepareInstallerEmbeddedNativeLibraries"
     BeforeTargets="AssignTargetPaths"
     Condition="'$(PublishAot)' == 'true' and '$(RuntimeIdentifier)' == 'win-x64'">
     <ItemGroup>
-      <InstallerNativeLibrary
-        Include="$(PkgAvalonia_Angle_Windows_Natives)\runtimes\win-x64\native\av_libglesv2.dll"
-        CompressedName="av_libglesv2.dll.gz"
-        Condition="Exists('$(PkgAvalonia_Angle_Windows_Natives)\runtimes\win-x64\native\av_libglesv2.dll')" />
       <InstallerNativeLibrary
         Include="$(PkgHarfBuzzSharp_NativeAssets_Win32)\runtimes\win-x64\native\libHarfBuzzSharp.dll"
         CompressedName="libHarfBuzzSharp.dll.gz"
@@ -53,9 +47,6 @@
       Command="powershell -NoProfile -ExecutionPolicy Bypass -File &quot;$(MSBuildThisFileDirectory)Compress-NativeLibrary.ps1&quot; -SourcePath &quot;%(InstallerNativeLibrary.FullPath)&quot; -DestinationPath &quot;$(IntermediateOutputPath)embedded-native\$(RuntimeIdentifier)\%(InstallerNativeLibrary.CompressedName)&quot;" />
 
     <ItemGroup>
-      <EmbeddedResource
-        Include="$(IntermediateOutputPath)embedded-native\$(RuntimeIdentifier)\av_libglesv2.dll.gz"
-        LogicalName="LanDesktopPLONDS.Installer.NativeLibraries.av_libglesv2.dll.gz" />
       <EmbeddedResource
         Include="$(IntermediateOutputPath)embedded-native\$(RuntimeIdentifier)\libHarfBuzzSharp.dll.gz"
         LogicalName="LanDesktopPLONDS.Installer.NativeLibraries.libHarfBuzzSharp.dll.gz" />
@@ -68,7 +59,7 @@
   <PropertyGroup Condition="'$(PublishAot)' == 'true'">
     <SuppressTrimAnalysisWarnings>false</SuppressTrimAnalysisWarnings>
     <TrimmerSingleWarn>false</TrimmerSingleWarn>
-    <JsonSerializerIsReflectionEnabledByDefault>true</JsonSerializerIsReflectionEnabledByDefault>
+    <JsonSerializerIsReflectionEnabledByDefault>false</JsonSerializerIsReflectionEnabledByDefault>
     <IsAotCompatible>true</IsAotCompatible>
   </PropertyGroup>
 </Project>

LanDesktopPLONDS.installer/LanDesktopPLONDS.installer.csproj

@@ -20,11 +20,9 @@
 
   <ItemGroup>
     <PackageReference Include="Avalonia" />
-    <PackageReference Include="Avalonia.Angle.Windows.Natives" GeneratePathProperty="true" PrivateAssets="all" />
+    <PackageReference Include="Avalonia.Angle.Windows.Natives" ExcludeAssets="all" PrivateAssets="all" />
     <PackageReference Include="Avalonia.Desktop" />
-    <PackageReference Include="Avalonia.Fonts.Inter" />
     <PackageReference Include="Avalonia.Themes.Fluent" />
-    <PackageReference Include="FluentIcons.Avalonia" />
     <PackageReference Include="HarfBuzzSharp.NativeAssets.Win32" GeneratePathProperty="true" PrivateAssets="all" />
     <PackageReference Include="SkiaSharp.NativeAssets.Win32" GeneratePathProperty="true" PrivateAssets="all" />
     <PackageReference Include="CommunityToolkit.Mvvm" />

LanDesktopPLONDS.installer/NativeDependencyBootstrapper.cs

@@ -13,7 +13,6 @@ internal static class NativeDependencyBootstrapper
 
     private static readonly string[] NativeLibraryNames =
     [
-        "av_libglesv2.dll",
         "libHarfBuzzSharp.dll",
         "libSkiaSharp.dll"
     ];
@@ -47,7 +46,7 @@ internal static class NativeDependencyBootstrapper
         }
         catch (Exception ex)
         {
-            System.Diagnostics.Debug.WriteLine($"[NativeDependencyBootstrapper] Failed to prepare native dependencies: {ex}");
+            InstallerStartupDiagnostics.Log($"Native dependency preparation failed: {ex}");
             return false;
         }
     }

LanDesktopPLONDS.installer/Program.cs

@@ -1,4 +1,5 @@
 using Avalonia;
+using Avalonia.Win32;
 
 namespace LanDesktopPLONDS.Installer;
 
@@ -7,17 +8,21 @@ public static class Program
     [STAThread]
     public static void Main(string[] args)
     {
+        InstallerStartupDiagnostics.Initialize();
         try
         {
+            InstallerStartupDiagnostics.Log("Preparing native dependencies.");
             if (!NativeDependencyBootstrapper.TryPrepare())
             {
-                System.Diagnostics.Debug.WriteLine("[Program] Failed to prepare native dependencies, but continuing...");
+                throw new InvalidOperationException("Failed to prepare native dependencies.");
             }
+
+            InstallerStartupDiagnostics.Log("Starting Avalonia desktop lifetime.");
             BuildAvaloniaApp().StartWithClassicDesktopLifetime(args);
         }
         catch (Exception ex)
         {
-            System.Diagnostics.Debug.WriteLine($"[Program] Unhandled exception: {ex}");
+            InstallerStartupDiagnostics.ReportFatal("The installer failed to start.", ex);
         }
     }
 
@@ -25,7 +30,10 @@ public static class Program
     {
         return AppBuilder.Configure<App>()
             .UsePlatformDetect()
-            .WithInterFont()
+            .With(new Win32PlatformOptions
-            .LogToTrace();
+            {
+                RenderingMode = [Win32RenderingMode.Software],
+                CompositionMode = [Win32CompositionMode.RedirectionSurface]
+            });
     }
 }

LanDesktopPLONDS.installer/Services/FilesPackageInstaller.cs

@@ -28,6 +28,7 @@ internal sealed class FilesPackageInstaller
         var sourceAppDirectory = ResolveFullPackageAppDirectory(package.ExtractDirectory, package.Version);
         var targetDeployment = BuildDeploymentDirectory(launcherRoot, package.Version);
 
+        InstallerElevation.EnsureCanInstall(launcherRoot);
         InstallerPathGuard.EnsureUsableInstallPath(launcherRoot, EstimateRequiredBytes(sourceAppDirectory));
         Directory.CreateDirectory(launcherRoot);
         await CopyLauncherRootPayloadAsync(package.ExtractDirectory, sourceAppDirectory, launcherRoot, package.Version, progress, cancellationToken)
@@ -299,7 +300,9 @@ internal sealed class FilesPackageInstaller
                 return;
             }
 
-            var startMenu = Environment.GetFolderPath(Environment.SpecialFolder.CommonStartMenu);
+            var startMenu = InstallerElevation.IsRunningElevated()
+                ? Environment.GetFolderPath(Environment.SpecialFolder.CommonStartMenu)
+                : Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);
             if (string.IsNullOrWhiteSpace(startMenu))
             {
                 startMenu = Environment.GetFolderPath(Environment.SpecialFolder.StartMenu);

LanDesktopPLONDS.installer/Services/InstallerElevation.cs

@@ -0,0 +1,52 @@
+using System.Security.Principal;
+
+namespace LanDesktopPLONDS.Installer.Services;
+
+internal static class InstallerElevation
+{
+    public static bool IsRunningElevated()
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return true;
+        }
+
+        using var identity = WindowsIdentity.GetCurrent();
+        var principal = new WindowsPrincipal(identity);
+        return principal.IsInRole(WindowsBuiltInRole.Administrator);
+    }
+
+    public static bool RequiresElevation(string installPath)
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return false;
+        }
+
+        var fullPath = Path.GetFullPath(installPath);
+        return IsUnderSpecialFolder(fullPath, Environment.SpecialFolder.ProgramFiles)
+               || IsUnderSpecialFolder(fullPath, Environment.SpecialFolder.ProgramFilesX86)
+               || IsUnderWindowsDirectory(fullPath);
+    }
+
+    public static void EnsureCanInstall(string installPath)
+    {
+        if (RequiresElevation(installPath) && !IsRunningElevated())
+        {
+            throw new UnauthorizedAccessException(
+                "The selected installation path requires administrator permission. Restart the installer as administrator or choose a user-writable folder.");
+        }
+    }
+
+    private static bool IsUnderSpecialFolder(string fullPath, Environment.SpecialFolder folder)
+    {
+        var root = Environment.GetFolderPath(folder);
+        return !string.IsNullOrWhiteSpace(root) && InstallerPathGuard.IsSameOrChildPath(root, fullPath);
+    }
+
+    private static bool IsUnderWindowsDirectory(string fullPath)
+    {
+        var windows = Environment.GetFolderPath(Environment.SpecialFolder.Windows);
+        return !string.IsNullOrWhiteSpace(windows) && InstallerPathGuard.IsSameOrChildPath(windows, fullPath);
+    }
+}

LanDesktopPLONDS.installer/Services/InstallerPathGuard.cs

@@ -6,15 +6,13 @@ public static class InstallerPathGuard
 
     public static string GetDefaultInstallPath()
     {
-        var programFiles = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
+        var localAppData = Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData);
-        if (string.IsNullOrWhiteSpace(programFiles))
+        if (string.IsNullOrWhiteSpace(localAppData))
         {
-            programFiles = Path.Combine(
+            localAppData = AppContext.BaseDirectory;
-                Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
-                "Programs");
         }
 
-        return Path.Combine(programFiles, ApplicationDirectoryName);
+        return Path.Combine(localAppData, "Programs", ApplicationDirectoryName);
     }
 
     public static string GetInstallPathForSelectedFolder(string selectedFolder)

LanDesktopPLONDS.installer/ViewModels/InstallerStepViewModel.cs

@@ -1,5 +1,4 @@
 using CommunityToolkit.Mvvm.ComponentModel;
-using FluentIcons.Common;
 using LanDesktopPLONDS.Installer.Models;
 
 namespace LanDesktopPLONDS.Installer.ViewModels;
@@ -7,7 +6,7 @@ namespace LanDesktopPLONDS.Installer.ViewModels;
 public sealed partial class InstallerStepViewModel(
     InstallerStepId stepId,
     string title,
-    Icon icon) : ObservableObject
+    string iconGlyph) : ObservableObject
 {
     [ObservableProperty]
     private bool _isUnlocked;
@@ -19,5 +18,5 @@ public sealed partial class InstallerStepViewModel(
 
     public string Title { get; } = title;
 
-    public Icon Icon { get; } = icon;
+    public string IconGlyph { get; } = iconGlyph;
 }

LanDesktopPLONDS.installer/ViewModels/MainWindowViewModel.cs

@@ -2,7 +2,6 @@ using System.Collections.ObjectModel;
 using System.Diagnostics;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
-using FluentIcons.Common;
 using LanDesktopPLONDS.Installer.Models;
 using LanDesktopPLONDS.Installer.Services;
 using LanMountainDesktop.Shared.Contracts.Privacy;
@@ -81,11 +80,11 @@ public sealed partial class MainWindowViewModel : ObservableObject
         _privacyConsentStore = privacyConsentStore ?? new InstallerPrivacyConsentStore();
         Steps =
         [
-            new InstallerStepViewModel(InstallerStepId.Welcome, "开始安装", Icon.Play),
+            new InstallerStepViewModel(InstallerStepId.Welcome, "开始安装", "\uE768"),
-            new InstallerStepViewModel(InstallerStepId.InstallLocation, "安装位置", Icon.Folder),
+            new InstallerStepViewModel(InstallerStepId.InstallLocation, "安装位置", "\uE838"),
-            new InstallerStepViewModel(InstallerStepId.PrivacyConfirm, "数据确认", Icon.Info),
+            new InstallerStepViewModel(InstallerStepId.PrivacyConfirm, "数据确认", "\uE946"),
-            new InstallerStepViewModel(InstallerStepId.Deploy, "开始部署", Icon.ArrowDownload),
+            new InstallerStepViewModel(InstallerStepId.Deploy, "开始部署", "\uE896"),
-            new InstallerStepViewModel(InstallerStepId.Complete, "完成安装", Icon.Circle)
+            new InstallerStepViewModel(InstallerStepId.Complete, "完成安装", "\uE73E")
         ];
         SyncSteps();
         DeviceIdPreview = _privacyIdentity.GetOrCreateDeviceId();

LanDesktopPLONDS.installer/Views/MainWindow.axaml

@@ -1,6 +1,5 @@
 <Window xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
-        xmlns:fi="using:FluentIcons.Avalonia"
         xmlns:vm="using:LanDesktopPLONDS.Installer.ViewModels"
         x:Class="LanDesktopPLONDS.Installer.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
@@ -62,7 +61,7 @@
     <Style Selector="Button.step-nav-item:disabled TextBlock.step-title">
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
-    <Style Selector="Button.step-nav-item:disabled fi|FluentIcon">
+    <Style Selector="Button.step-nav-item:disabled TextBlock.installer-icon">
       <Setter Property="Foreground" Value="{DynamicResource InstallerDisabledTextBrush}" />
     </Style>
     <Style Selector="Border.step-nav-selected-fill">
@@ -129,8 +128,8 @@
                   Height="28"
                   Background="{DynamicResource InstallerAccentBrush}"
                   CornerRadius="{DynamicResource DesignCornerRadiusSm}">
-            <fi:FluentIcon Icon="ArrowDownload"
+            <TextBlock Classes="installer-icon"
-                           IconVariant="Regular"
+                       Text="&#xE896;"
                        Foreground="{DynamicResource InstallerOnAccentBrush}"
                        FontSize="16" />
           </Border>
@@ -148,15 +147,15 @@
           <Button Classes="titlebar-icon-button"
                   ToolTip.Tip="最小化"
                   Click="OnMinimizeClick">
-            <fi:FluentIcon Icon="Subtract"
+            <TextBlock Classes="installer-icon"
-                           IconVariant="Regular"
+                       Text="&#xE921;"
                        FontSize="14" />
           </Button>
           <Button Classes="titlebar-icon-button"
                   ToolTip.Tip="关闭"
                   Click="OnCloseClick">
-            <fi:FluentIcon Icon="Dismiss"
+            <TextBlock Classes="installer-icon"
-                           IconVariant="Regular"
+                       Text="&#xE711;"
                        FontSize="14" />
           </Button>
         </StackPanel>
@@ -196,13 +195,13 @@
                           Margin="10,0">
                       <Grid Width="18"
                             VerticalAlignment="Center">
-                        <fi:FluentIcon Icon="{Binding Icon}"
+                        <TextBlock Classes="installer-icon"
-                                       IconVariant="Regular"
+                                   Text="{Binding IconGlyph}"
                                    Foreground="{DynamicResource InstallerTextSecondaryBrush}"
                                    FontSize="17"
                                    IsVisible="{Binding !IsSelected}" />
-                        <fi:FluentIcon Icon="{Binding Icon}"
+                        <TextBlock Classes="installer-icon"
-                                       IconVariant="Filled"
+                                   Text="{Binding IconGlyph}"
                                    Foreground="{DynamicResource InstallerTextPrimaryBrush}"
                                    FontSize="17"
                                    IsVisible="{Binding IsSelected}" />
@@ -257,8 +256,8 @@
                             Height="40"
                             Background="{DynamicResource InstallerSubtleFillBrush}"
                             CornerRadius="{DynamicResource DesignCornerRadiusMd}">
-                      <fi:FluentIcon Icon="CloudArrowDown"
+                      <TextBlock Classes="installer-icon"
-                                     IconVariant="Regular"
+                                 Text="&#xE896;"
                                  FontSize="20" />
                     </Border>
                     <StackPanel Grid.Column="1"
@@ -302,8 +301,8 @@
                               Command="{Binding BrowseCommand}">
                         <StackPanel Orientation="Horizontal"
                                     Spacing="6">
-                          <fi:FluentIcon Icon="FolderOpen"
+                          <TextBlock Classes="installer-icon"
-                                         IconVariant="Regular" />
+                                     Text="&#xE838;" />
                           <TextBlock Text="浏览" />
                         </StackPanel>
                       </Button>
@@ -341,8 +340,8 @@
                     <Border Classes="info-panel">
                       <Grid ColumnDefinitions="Auto,*"
                             ColumnSpacing="10">
-                        <fi:FluentIcon Icon="Shield"
+                        <TextBlock Classes="installer-icon"
-                                       IconVariant="Regular"
+                                   Text="&#xEA18;"
                                    Foreground="{DynamicResource InstallerAccentBrush}"
                                    FontSize="18" />
                         <TextBlock Grid.Column="1"
@@ -416,8 +415,8 @@
                               Command="{Binding StartInstallCommand}">
                         <StackPanel Orientation="Horizontal"
                                     Spacing="6">
-                          <fi:FluentIcon Icon="ArrowDownload"
+                          <TextBlock Classes="installer-icon"
-                                         IconVariant="Regular" />
+                                     Text="&#xE896;" />
                           <TextBlock Text="开始安装" />
                         </StackPanel>
                       </Button>
@@ -426,8 +425,8 @@
                               IsEnabled="{Binding IsInstalling}">
                         <StackPanel Orientation="Horizontal"
                                     Spacing="6">
-                          <fi:FluentIcon Icon="Dismiss"
+                          <TextBlock Classes="installer-icon"
-                                         IconVariant="Regular" />
+                                     Text="&#xE711;" />
                           <TextBlock Text="取消" />
                         </StackPanel>
                       </Button>
@@ -454,8 +453,8 @@
                             Height="40"
                             Background="{DynamicResource InstallerSubtleFillBrush}"
                             CornerRadius="{DynamicResource DesignCornerRadiusMd}">
-                      <fi:FluentIcon Icon="CheckmarkCircle"
+                      <TextBlock Classes="installer-icon"
-                                     IconVariant="Regular"
+                                 Text="&#xE73E;"
                                  Foreground="{DynamicResource InstallerSuccessBrush}"
                                  FontSize="22" />
                     </Border>
@@ -473,8 +472,8 @@
                               Command="{Binding LaunchCommand}">
                         <StackPanel Orientation="Horizontal"
                                     Spacing="6">
-                          <fi:FluentIcon Icon="Play"
+                          <TextBlock Classes="installer-icon"
-                                         IconVariant="Regular" />
+                                     Text="&#xE768;" />
                           <TextBlock Text="打开阑山桌面" />
                         </StackPanel>
                       </Button>
@@ -495,8 +494,8 @@
                     IsVisible="{Binding HasError}">
               <Grid ColumnDefinitions="Auto,*"
                     ColumnSpacing="10">
-                <fi:FluentIcon Icon="ErrorCircle"
+                <TextBlock Classes="installer-icon"
-                               IconVariant="Regular"
+                           Text="&#xE783;"
                            Foreground="{DynamicResource InstallerErrorBrush}"
                            FontSize="18" />
                 <TextBlock Grid.Column="1"
@@ -511,8 +510,8 @@
                     Command="{Binding BackCommand}">
               <StackPanel Orientation="Horizontal"
                           Spacing="6">
-                <fi:FluentIcon Icon="ArrowLeft"
+                <TextBlock Classes="installer-icon"
-                               IconVariant="Regular" />
+                           Text="&#xE72B;" />
                 <TextBlock Text="上一步" />
               </StackPanel>
             </Button>
@@ -522,8 +521,8 @@
               <StackPanel Orientation="Horizontal"
                           Spacing="6">
                 <TextBlock Text="下一步" />
-                <fi:FluentIcon Icon="ArrowRight"
+                <TextBlock Classes="installer-icon"
-                               IconVariant="Regular" />
+                           Text="&#xE72A;" />
               </StackPanel>
             </Button>
           </Grid>

LanDesktopPLONDS.installer/app.manifest

@@ -5,7 +5,7 @@
   <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
     <security>
       <requestedPrivileges xmlns="urn:schemas-microsoft-com:asm.v3">
-        <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
+        <requestedExecutionLevel level="asInvoker" uiAccess="false" />
       </requestedPrivileges>
     </security>
   </trustInfo>

LanMountainDesktop.Launcher/Deployment/DeploymentLocator.cs

@@ -87,31 +87,68 @@ internal sealed class DeploymentLocator
         var explicitAppRoot = context.ExplicitAppRoot;
         var devModeConfigIgnored = !context.IsDebugMode && Views.ErrorWindow.CheckDevModeEnabled();
 
+        Logger.Info($"=== HOST RESOLUTION START ===");
+        Logger.Info($"  AppRoot: {_appRoot}");
+        Logger.Info($"  Executable: {executable}");
+        Logger.Info($"  IsDebugMode: {context.IsDebugMode}");
+        Logger.Info($"  ExplicitAppRoot: {explicitAppRoot ?? "<none>"}");
+        Logger.Info($"  LauncherBaseDirectory: {AppContext.BaseDirectory}");
+
         string? resolvedPath;
         string? source;
 
         if (!string.IsNullOrWhiteSpace(explicitAppRoot))
         {
+            Logger.Info($"Trying explicit app root: {explicitAppRoot}");
             var explicitRoot = Path.GetFullPath(explicitAppRoot);
             resolvedPath = TryResolveExplicitAppRoot(explicitRoot, executable, searchedPaths, out source);
         }
         else
         {
+            Logger.Info("Trying published or portable host...");
             resolvedPath = TryResolvePublishedOrPortableHost(executable, searchedPaths, out source);
         }
 
         if (resolvedPath is null && context.IsDebugMode)
         {
+            Logger.Info("Debug mode: trying debug host paths...");
             resolvedPath = TryResolveDebugHost(executable, searchedPaths, out source);
         }
 
         if (resolvedPath is null)
         {
+            Logger.Warn("Standard resolution failed, trying legacy fallback...");
             resolvedPath = ResolveHostExecutablePathLegacy();
             if (!string.IsNullOrWhiteSpace(resolvedPath))
             {
                 searchedPaths.Add(Path.GetFullPath(resolvedPath));
                 source = "legacy_fallback";
+                Logger.Info($"Legacy fallback found: {resolvedPath}");
+            }
+        }
+
+        Logger.Info($"=== HOST RESOLUTION RESULT ===");
+        Logger.Info($"  Success: {!string.IsNullOrWhiteSpace(resolvedPath)}");
+        Logger.Info($"  ResolvedPath: {resolvedPath ?? "<NOT FOUND>"}");
+        Logger.Info($"  Source: {source ?? "<none>"}");
+        Logger.Info($"  SearchedPaths ({searchedPaths.Count}):");
+        foreach (var path in searchedPaths.Take(10))
+        {
+            Logger.Info($"    - {path}");
+        }
+        if (searchedPaths.Count > 10)
+        {
+            Logger.Info($"    ... and {searchedPaths.Count - 10} more");
+        }
+
+        if (string.IsNullOrWhiteSpace(resolvedPath))
+        {
+            Logger.Error("CRITICAL: Could not resolve host executable path!");
+            Console.Error.WriteLine("[CRITICAL] Could not find main application executable!");
+            Console.Error.WriteLine($"[CRITICAL] Searched {searchedPaths.Count} locations:");
+            foreach (var path in searchedPaths.Take(5))
+            {
+                Console.Error.WriteLine($"[CRITICAL]   - {path}");
             }
         }
 

LanMountainDesktop.Launcher/Shell/AirAppRuntimeBridge.cs

@@ -19,12 +19,15 @@ internal sealed class AirAppRuntimeBridge
 
     public async Task EnsureStartedAsync()
     {
+        Logger.Info($"AIRAPP: Checking if AirApp Runtime is available. AppRoot='{_appRoot}'");
+
         if (await TryGetStatusAsync().ConfigureAwait(false) is not null)
         {
-            Logger.Info("AirApp Runtime is already available.");
+            Logger.Info("AIRAPP: AirApp Runtime is already available.");
             return;
         }
 
+        Logger.Info("AIRAPP: Starting AirApp Runtime...");
         Process? process;
         try
         {
@@ -36,24 +39,28 @@ internal sealed class AirAppRuntimeBridge
         }
         catch (Exception ex)
         {
-            Logger.Warn($"AirApp Runtime start request failed. AppRoot='{_appRoot}'; Error='{ex.Message}'.");
+            Logger.Warn($"AIRAPP: AirApp Runtime start request failed. AppRoot='{_appRoot}'; Error='{ex.Message}'");
             return;
         }
 
-        Logger.Info($"AirApp Runtime start requested. Pid={(process is null ? -1 : process.Id)}; AppRoot='{_appRoot}'.");
+        Logger.Info($"AIRAPP: AirApp Runtime start requested. Pid={(process is null ? -1 : process.Id)}; AppRoot='{_appRoot}'.");
 
         for (var attempt = 1; attempt <= ConnectAttempts; attempt++)
         {
+            Logger.Info($"AIRAPP: Attempt {attempt}/{ConnectAttempts} - Checking IPC connection...");
+
             if (await TryGetStatusAsync().ConfigureAwait(false) is not null)
             {
-                Logger.Info("AirApp Runtime IPC is ready.");
+                Logger.Info("AIRAPP: AirApp Runtime IPC is ready.");
                 return;
             }
 
-            await Task.Delay(TimeSpan.FromMilliseconds(250 * attempt)).ConfigureAwait(false);
+            var delayMs = 250 * attempt;
+            Logger.Info($"AIRAPP: IPC not ready, waiting {delayMs}ms before retry...");
+            await Task.Delay(TimeSpan.FromMilliseconds(delayMs)).ConfigureAwait(false);
         }
 
-        Logger.Warn("AirApp Runtime did not become ready after pre-start; Host fallback remains available.");
+        Logger.Warn("AIRAPP: AirApp Runtime did not become ready after pre-start; Host fallback remains available.");
     }
 
     public async Task AttachHostAsync(int hostProcessId)
@@ -65,10 +72,15 @@ internal sealed class AirAppRuntimeBridge
 
         try
         {
+            using var cts = new CancellationTokenSource();
             using var client = new LanMountainDesktopIpcClient();
-            await client.ConnectAsync(IpcConstants.AirAppRuntimePipeName).ConfigureAwait(false);
+
+            var connectTask = client.ConnectAsync(IpcConstants.AirAppRuntimePipeName);
+            await connectTask.WaitAsync(TimeSpan.FromSeconds(3), cts.Token).ConfigureAwait(false);
+
             var proxy = client.CreateProxy<IAirAppRuntimeControlService>();
-            var result = await proxy.AttachHostAsync(hostProcessId).ConfigureAwait(false);
+            var attachTask = proxy.AttachHostAsync(hostProcessId);
+            var result = await attachTask.WaitAsync(TimeSpan.FromSeconds(3), cts.Token).ConfigureAwait(false);
             Logger.Info($"AirApp Runtime host attach completed. Accepted={result.Accepted}; Code='{result.Code}'; HostPid={hostProcessId}.");
         }
         catch (Exception ex)
@@ -81,13 +93,29 @@ internal sealed class AirAppRuntimeBridge
     {
         try
         {
+            using var cts = new CancellationTokenSource();
             using var client = new LanMountainDesktopIpcClient();
-            await client.ConnectAsync(IpcConstants.AirAppRuntimePipeName).ConfigureAwait(false);
+
+            var connectTask = client.ConnectAsync(IpcConstants.AirAppRuntimePipeName);
+            await connectTask.WaitAsync(TimeSpan.FromSeconds(2), cts.Token).ConfigureAwait(false);
+
             var proxy = client.CreateProxy<IAirAppRuntimeControlService>();
-            return await proxy.GetStatusAsync().ConfigureAwait(false);
+            var statusTask = proxy.GetStatusAsync();
+            return await statusTask.WaitAsync(TimeSpan.FromSeconds(2), cts.Token).ConfigureAwait(false);
         }
-        catch
+        catch (TimeoutException)
         {
+            Logger.Info("AIRAPP: TryGetStatusAsync timed out (2s).");
+            return null;
+        }
+        catch (OperationCanceledException)
+        {
+            Logger.Info("AIRAPP: TryGetStatusAsync cancelled.");
+            return null;
+        }
+        catch (Exception ex)
+        {
+            Logger.Info($"AIRAPP: TryGetStatusAsync failed: {ex.GetType().Name} - {ex.Message}");
             return null;
         }
     }

LanMountainDesktop.Launcher/Shell/LauncherOrchestrator.cs

@@ -144,8 +144,18 @@ internal sealed class LauncherOrchestrator
                     return;
                 }
 
+                if (!softTimeoutShown)
+                {
+                    // 用户在软超时前关闭窗口，提示确认
+                    Logger.Info("Splash window was closed manually before soft timeout. Cancelling startup attempt.");
+                    _startupAttemptRegistry.MarkOwnedFailed(lastStage, "User cancelled startup before soft timeout.");
+                    // 取消后续监控
+                    successTcs.TrySetCanceled();
+                    return;
+                }
+
                 _startupAttemptRegistry.MarkOwnedDetachedWaiting();
-                Logger.Warn("Splash window was closed manually. Launcher will continue monitoring the current startup attempt.");
+                Logger.Warn("Splash window was closed manually after soft timeout. Launcher will continue monitoring the current startup attempt in detached mode.");
             };
             splashWindow.Closed += splashClosedHandler;
 

LanMountainDesktop.Launcher/Startup/HostLaunchService.cs

@@ -208,13 +208,15 @@ internal sealed class HostLaunchService
 
     private static async Task EnsureAirAppRuntimeStartedAsync(string appRoot, string? dataRoot)
     {
+        Logger.Info("HOST LAUNCH: Attempting to pre-start AirApp Runtime...");
         try
         {
             await new AirAppRuntimeBridge(appRoot, dataRoot).EnsureStartedAsync().ConfigureAwait(false);
+            Logger.Info("HOST LAUNCH: AirApp Runtime pre-start completed.");
         }
         catch (Exception ex)
         {
-            Logger.Warn($"AirApp Runtime pre-start failed; Host fallback remains available. Error='{ex.Message}'.");
+            Logger.Warn($"HOST LAUNCH: AirApp Runtime pre-start failed; Host fallback remains available. Error='{ex.Message}'");
         }
     }
 
@@ -249,6 +251,11 @@ internal sealed class HostLaunchService
 
         try
         {
+            Logger.Info($"ATTEMPTING HOST START: Path='{plan.HostPath}'; WorkingDir='{plan.WorkingDirectory}'; Mode='{startMode}'");
+            Logger.Info($"  Arguments: {HostLaunchPlanBuilder.FormatArgumentsForLog(plan.Arguments)}");
+            Logger.Info($"  File exists: {File.Exists(plan.HostPath)}");
+            Logger.Info($"  Working dir exists: {Directory.Exists(plan.WorkingDirectory)}");
+
             var process = Process.Start(startInfo);
             Logger.Info(
                 $"Host launch requested. Mode='{startMode}'; RetryTag='{retryTag ?? "<none>"}'; Path='{plan.HostPath}'; " +
@@ -257,15 +264,30 @@ internal sealed class HostLaunchService
 
             if (process is null)
             {
+                Logger.Error($"CRITICAL: Process.Start returned null! Path='{plan.HostPath}'; Mode='{startMode}'");
+                Console.Error.WriteLine($"[CRITICAL] Process.Start returned null for path: {plan.HostPath}");
                 return HostStartAttempt.StartFailed(startMode, "process_start_returned_null", plan);
             }
 
-            await Task.Yield();
+            // 等待一小段时间，检查进程是否立即退出
+            await Task.Delay(500).ConfigureAwait(false);
+
+            if (process.HasExited)
+            {
+                Logger.Error($"CRITICAL: Host process exited immediately! ExitCode={process.ExitCode}; Path='{plan.HostPath}'");
+                Console.Error.WriteLine($"[CRITICAL] Host process exited immediately with code {process.ExitCode}");
+                return HostStartAttempt.StartFailed(startMode, $"process_exited_immediately_code_{process.ExitCode}", plan);
+            }
+
+            Logger.Info($"Host process started successfully and is running. PID={process.Id}");
             return HostStartAttempt.Started(startMode, process, plan);
         }
         catch (Exception ex)
         {
-            Logger.Error($"Host start failed. Mode='{startMode}'.", ex);
+            Logger.Error($"CRITICAL: Host start exception! Path='{plan.HostPath}'; Mode='{startMode}'; Exception={ex.GetType().Name}; Message='{ex.Message}'", ex);
+            Console.Error.WriteLine($"[CRITICAL] Host start failed: {ex.Message}");
+            Console.Error.WriteLine($"[CRITICAL] Path: {plan.HostPath}");
+            Console.Error.WriteLine($"[CRITICAL] Exception: {ex}");
             return HostStartAttempt.StartFailed(startMode, ex.GetType().Name, plan);
         }
     }

LanMountainDesktop.Launcher/Startup/HostStartupMonitor.cs

@@ -86,7 +86,7 @@ internal sealed class HostStartupMonitor
             ]).ConfigureAwait(false);
         if (!connected)
         {
-            Logger.Info("Host public IPC is not ready yet. Launcher will keep monitoring the host process and retry.");
+            Logger.Info("Host public IPC is not ready yet after initial connection attempts. Launcher will keep monitoring the host process and retry periodically.");
         }
         else
         {
@@ -106,6 +106,8 @@ internal sealed class HostStartupMonitor
         var nextShellStatusPollAt = DateTimeOffset.UtcNow + StartupTimeoutPolicy.ShellStatusPollInterval;
         var ipcReconnectAttemptIndex = 0;
         var activationRetryAttempted = false;
+        var lastIpcConnectionFailureReported = DateTimeOffset.MinValue;
+        var ipcConnectionFailureCount = 0;
 
         while (true)
         {
@@ -224,6 +226,7 @@ internal sealed class HostStartupMonitor
                 if (connected)
                 {
                     ipcConnected = true;
+                    Logger.Info($"Host public IPC reconnected successfully after {ipcConnectionFailureCount} failed attempts.");
                     var shellSuccess = await RefreshShellStatusAsync("Host public IPC reconnected; waiting for desktop shell.")
                         .ConfigureAwait(false);
                     if (shellSuccess is not null)
@@ -232,6 +235,18 @@ internal sealed class HostStartupMonitor
                         continue;
                     }
                 }
+                else
+                {
+                    ipcConnectionFailureCount++;
+                    // 每 30 秒报告一次 IPC 连接失败
+                    if ((now - lastIpcConnectionFailureReported).TotalSeconds >= 30)
+                    {
+                        lastIpcConnectionFailureReported = now;
+                        var elapsed = (now - startedAt).TotalSeconds;
+                        Logger.Warn($"Host public IPC connection still unavailable after {elapsed:0}s and {ipcConnectionFailureCount} reconnect attempts. Host process is alive (PID={request.HostProcess.Id}).");
+                        request.Reporter.Report("diagnostic", $"正在等待主应用响应... (已尝试 {ipcConnectionFailureCount} 次)");
+                    }
+                }
 
                 nextReconnectAttemptAt = DateTimeOffset.UtcNow + StartupTimeoutPolicy.IpcReconnectInterval;
             }
@@ -263,6 +278,16 @@ internal sealed class HostStartupMonitor
                 nextCheckpointAt = softTimeoutAt;
             }
 
+            if (!ipcConnected && nextReconnectAttemptAt < nextCheckpointAt)
+            {
+                nextCheckpointAt = nextReconnectAttemptAt;
+            }
+
+            if (ipcConnected && nextShellStatusPollAt < nextCheckpointAt)
+            {
+                nextCheckpointAt = nextShellStatusPollAt;
+            }
+
             var delay = nextCheckpointAt - now;
             if (delay > TimeSpan.FromSeconds(1))
             {
@@ -351,11 +376,11 @@ internal sealed class HostStartupMonitor
         if (!connected && !request.HostProcess.HasExited)
         {
             request.AttemptRegistry.MarkOwnedWaitingForShell("Host process is still running, but public IPC is not ready yet.");
-            request.PublishCoordinatorStatus(true, false, true);
+            request.PublishCoordinatorStatus(true, true, false);
             return new Outcome(
-                true,
+                false,
-                "startup_pending",
+                "ipc_connection_failed",
-                "Host process is still running; Launcher will not start another process while public IPC finishes startup.",
+                $"Host process is still running after {StartupTimeoutPolicy.HardTimeout.TotalSeconds:0} seconds, but public IPC connection could not be established. This may indicate the host is stuck during initialization.",
                 recoveryActivationAttempted,
                 request.ComposeLaunchDetails(true, recoveryActivationAttempted));
         }

LanMountainDesktop.Launcher/Startup/StartupAttemptRegistry.cs

@@ -89,6 +89,14 @@ internal sealed class StartupAttemptRegistry
         ExecuteWithLock(() =>
         {
             var existing = LoadUnsafe();
+
+            // 清理过期的记录
+            if (existing is not null && IsStaleAttempt(existing))
+            {
+                Logger.Info($"Cleaning up stale startup attempt record. AttemptId='{existing.AttemptId}'; State='{existing.State}'; Age={(DateTimeOffset.UtcNow - existing.UpdatedAtUtc).TotalMinutes:0.1}min.");
+                existing = null;
+            }
+
             if (existing is not null && IsCoordinatorLive(existing))
             {
                 active = Clone(existing);
@@ -145,6 +153,34 @@ internal sealed class StartupAttemptRegistry
         return reserved is not null;
     }
 
+    private static bool IsStaleAttempt(StartupAttemptRecord record)
+    {
+        // 记录超过 10 分钟且状态为终结或非活跃状态
+        if (DateTimeOffset.UtcNow - record.UpdatedAtUtc > TimeSpan.FromMinutes(10))
+        {
+            return true;
+        }
+
+        // 进程已死且协调器心跳超时
+        if (record.CoordinatorPid > 0 &&
+            !TryGetLiveProcess(record.CoordinatorPid, out _) &&
+            DateTimeOffset.UtcNow - record.HeartbeatAtUtc > TimeSpan.FromMinutes(2))
+        {
+            return true;
+        }
+
+        // 主进程已死且协调器已死
+        if (record.HostPid > 0 &&
+            !TryGetLiveProcess(record.HostPid, out _) &&
+            record.CoordinatorPid > 0 &&
+            !TryGetLiveProcess(record.CoordinatorPid, out _))
+        {
+            return true;
+        }
+
+        return false;
+    }
+
     public StartupAttemptRecord? GetOwnedAttempt()
     {
         StartupAttemptRecord? result = null;

LanMountainDesktop.Launcher/Startup/StartupTimeoutPolicy.cs

@@ -2,22 +2,26 @@ namespace LanMountainDesktop.Launcher.Startup;
 
 internal static class StartupTimeoutPolicy
 {
-    public static readonly TimeSpan SoftTimeout = TimeSpan.FromSeconds(30);
+    public static readonly TimeSpan SoftTimeout = TimeSpan.FromSeconds(45);
-    public static readonly TimeSpan HardTimeout = TimeSpan.FromSeconds(120);
+    public static readonly TimeSpan HardTimeout = TimeSpan.FromSeconds(180);
 
-    /// <summary>Initial Public IPC connect attempt (AOT cold start may be slower).</summary>
+    /// <summary>Initial Public IPC connect attempt (AOT cold start is significantly slower).</summary>
-    public static readonly TimeSpan InitialIpcConnectTimeout = TimeSpan.FromMilliseconds(1200);
+    public static readonly TimeSpan InitialIpcConnectTimeout = TimeSpan.FromMilliseconds(3000);
 
     /// <summary>Subsequent reconnect attempts use increasing per-try timeouts.</summary>
     public static readonly TimeSpan[] IpcReconnectAttemptTimeouts =
     [
-        TimeSpan.FromMilliseconds(800),
         TimeSpan.FromMilliseconds(1500),
         TimeSpan.FromMilliseconds(3000),
-        TimeSpan.FromMilliseconds(5000)
+        TimeSpan.FromMilliseconds(5000),
+        TimeSpan.FromMilliseconds(8000),
+        TimeSpan.FromMilliseconds(10000)
     ];
 
-    public static readonly TimeSpan ExistingHostProbeTimeout = TimeSpan.FromMilliseconds(900);
+    public static readonly TimeSpan ExistingHostProbeTimeout = TimeSpan.FromMilliseconds(1500);
     public static readonly TimeSpan ShellStatusPollInterval = TimeSpan.FromSeconds(1);
-    public static readonly TimeSpan IpcReconnectInterval = TimeSpan.FromSeconds(2);
+    public static readonly TimeSpan IpcReconnectInterval = TimeSpan.FromSeconds(3);
+
+    /// <summary>Maximum time to wait for host process exit after it starts (for early-exit detection).</summary>
+    public static readonly TimeSpan HostEarlyExitWindow = TimeSpan.FromSeconds(5);
 }

LanMountainDesktop.Tests/OnlineInstallerCoreTests.cs

@@ -212,6 +212,33 @@ public sealed class OnlineInstallerCoreTests : IDisposable
         Assert.ThrowsAny<Exception>(() => InstallerPathGuard.NormalizeInstallPath(path));
     }
 
+    [Fact]
+    public void InstallerPathGuard_DefaultsToUserWritableProgramsFolder()
+    {
+        var path = InstallerPathGuard.GetDefaultInstallPath();
+
+        Assert.EndsWith(Path.Combine("Programs", InstallerPathGuard.ApplicationDirectoryName), path);
+        Assert.DoesNotContain("Program Files", path, StringComparison.OrdinalIgnoreCase);
+    }
+
+    [Fact]
+    public void InstallerElevation_DetectsProtectedProgramFilesPath()
+    {
+        if (!OperatingSystem.IsWindows())
+        {
+            return;
+        }
+
+        var programFiles = Environment.GetFolderPath(Environment.SpecialFolder.ProgramFiles);
+        if (string.IsNullOrWhiteSpace(programFiles))
+        {
+            return;
+        }
+
+        Assert.True(InstallerElevation.RequiresElevation(Path.Combine(programFiles, InstallerPathGuard.ApplicationDirectoryName)));
+        Assert.False(InstallerElevation.RequiresElevation(Path.Combine(_tempRoot, InstallerPathGuard.ApplicationDirectoryName)));
+    }
+
     [Fact]
     public async Task FilesPackageInstaller_DeploysFullPackageWithCurrentMarker()
     {

LanMountainDesktop/App.axaml.cs

@@ -246,6 +246,9 @@ public partial class App : Application
                 ReportStartupProgress(StartupStage.Initializing, 10, "Initializing application...");
                 ReportStartupProgress(StartupStage.LoadingSettings, 20, "Loading settings...");
             }
+
+            // 启动心跳线程，确保启动器能检测到主应用的活跃状态
+            _ = StartLauncherHeartbeatAsync();
         }
         catch (Exception ex)
         {
@@ -253,6 +256,39 @@ public partial class App : Application
         }
     }
 
+    private async Task StartLauncherHeartbeatAsync()
+    {
+        try
+        {
+            // 每 5 秒发送一次心跳，防止启动器认为主应用已卡死
+            while (!IsShutdownInProgress && _publicIpcHostService is not null)
+            {
+                await Task.Delay(TimeSpan.FromSeconds(5));
+
+                // 如果还未报告 Ready，发送心跳进度
+                if (!_mainWindowOpened && !IsShutdownInProgress)
+                {
+                    // 静默心跳，不记录日志
+                    QueueOrSendLauncherProgress(new StartupProgressMessage
+                    {
+                        Stage = StartupStage.Initializing,
+                        ProgressPercent = 15,
+                        Message = "Application is initializing...",
+                        Timestamp = DateTimeOffset.UtcNow
+                    }, logSuccess: false);
+                }
+                else
+                {
+                    break; // 主窗口已打开，停止心跳
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("LauncherIpc", $"Heartbeat thread failed: {ex.Message}");
+        }
+    }
+
     private void ReportStartupProgress(StartupStage stage, int percent, string message)
     {
         QueueOrSendLauncherProgress(new StartupProgressMessage
@@ -1824,11 +1860,22 @@ public partial class App : Application
             _publicIpcHostService.Start();
             AppLogger.Info(
                 "PublicIpc",
-                $"Public IPC host started. PipeName='{IpcConstants.DefaultPipeName}'; Version='{versionInfo.Version}'; Codename='{versionInfo.Codename}'.");
+                $"Public IPC host started successfully. PipeName='{IpcConstants.DefaultPipeName}'; Version='{versionInfo.Version}'; Codename='{versionInfo.Codename}'.");
         }
         catch (Exception ex)
         {
-            AppLogger.Warn("PublicIpc", "Failed to initialize public IPC host.", ex);
+            AppLogger.Error("PublicIpc", "CRITICAL: Failed to initialize public IPC host. Launcher will not be able to connect to this process.", ex);
+
+            // 尝试通过标准错误输出告知启动器
+            try
+            {
+                Console.Error.WriteLine($"[CRITICAL] Public IPC host initialization failed: {ex.Message}");
+                Console.Error.WriteLine("[CRITICAL] The launcher will not be able to connect to this process.");
+            }
+            catch
+            {
+                // 忽略控制台写入失败
+            }
         }
     }
 

LanMountainDesktop/ComponentSystem/ComponentRegistry.cs

@@ -116,8 +116,8 @@ public sealed class ComponentRegistry
                 "Class Schedule",
                 "CalendarDate",
                 "Date",
-                MinWidthCells: 2,
+                MinWidthCells: 4,
-                MinHeightCells: 4,
+                MinHeightCells: 3,
                 AllowStatusBarPlacement: false,
                 AllowDesktopPlacement: true,
                 ResizeMode: DesktopComponentResizeMode.Free),

LanMountainDesktop/Views/Components/ClassScheduleWidget.axaml.cs

@@ -683,18 +683,18 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
         var scale = ResolveScale();
         var cardRadius = ComponentChromeCornerRadiusHelper.Small();
-        var timeFontSize = Math.Clamp(11 * scale, 8, 14);
+        var timeFontSize = Math.Clamp(16 * scale, 12, 22);
-        var courseNameFontSize = Math.Clamp(14 * scale, 10, 18);
+        var courseNameFontSize = Math.Clamp(20 * scale, 16, 28);
-        var detailFontSize = Math.Clamp(11 * scale, 8, 14);
+        var detailFontSize = Math.Clamp(15 * scale, 12, 20);
-        var progressFontSize = Math.Clamp(10 * scale, 7, 12);
+        var progressFontSize = Math.Clamp(13 * scale, 10, 16);
         var cardPadding = new Thickness(
-            Math.Clamp(10 * scale, 6, 14),
+            Math.Clamp(14 * scale, 10, 20),
-            Math.Clamp(8 * scale, 5, 12),
+            Math.Clamp(12 * scale, 8, 18),
-            Math.Clamp(10 * scale, 6, 14),
+            Math.Clamp(14 * scale, 10, 20),
-            Math.Clamp(8 * scale, 5, 12));
+            Math.Clamp(12 * scale, 8, 18));
-        var timeColumnWidth = Math.Clamp(44 * scale, 30, 56);
+        var timeColumnWidth = Math.Clamp(60 * scale, 45, 80);
-        var accentBarWidth = Math.Clamp(3 * scale, 2, 4);
+        var accentBarWidth = Math.Clamp(4 * scale, 3, 6);
-        var progressBarHeight = Math.Clamp(3 * scale, 2, 4);
+        var progressBarHeight = Math.Clamp(4 * scale, 3, 6);
 
         for (var i = 0; i < _courseItems.Count; i++)
         {
@@ -894,10 +894,10 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
         var itemBorder = new Border
         {
             Padding = new Thickness(
-                Math.Clamp(10 * scale, 6, 14),
+                Math.Clamp(14 * scale, 10, 20),
-                Math.Clamp(2 * scale, 1, 4),
+                Math.Clamp(4 * scale, 2, 6),
-                Math.Clamp(10 * scale, 6, 14),
+                Math.Clamp(14 * scale, 10, 20),
-                Math.Clamp(2 * scale, 1, 4)),
+                Math.Clamp(4 * scale, 2, 6)),
             Background = Brushes.Transparent,
             Child = itemGrid
         };
@@ -1022,11 +1022,11 @@ public partial class ClassScheduleWidget : UserControl, IDesktopComponentWidget,
 
         HeaderGrid.ColumnSpacing = Math.Clamp(8 * scale, 4, 14);
         DateGroup.Spacing = Math.Clamp(1.5 * scale, 0.5, 3);
-        CourseListPanel.Spacing = Math.Clamp(2 * scale, 0, 6);
+        CourseListPanel.Spacing = Math.Clamp(4 * scale, 2, 8);
 
-        var dateFontByScale = Math.Clamp(28 * scale, 14, 36);
+        var dateFontByScale = Math.Clamp(36 * scale, 20, 48);
-        var weekdayFontByScale = Math.Clamp(14 * scale, 10, 18);
+        var weekdayFontByScale = Math.Clamp(18 * scale, 14, 24);
-        var classCountFontByScale = Math.Clamp(12 * scale, 9, 15);
+        var classCountFontByScale = Math.Clamp(15 * scale, 12, 20);
 
         var availableWidth = Math.Max(1, Bounds.Width - headerPadding.Left - headerPadding.Right);
         var dateGroupEstimatedWidth = dateFontByScale * 0.6 * 3 + DateGroup.Spacing * 2;