fix.修ci，修融合桌面，修启动器

LanMountainDesktop.Launcher/Services/LauncherFlowCoordinator.cs

@@ -184,13 +184,23 @@ internal sealed class LauncherFlowCoordinator
                     
                     var completedTask = await readyOrTimeoutOrExit;
                     
-                    // 检查是否是进程先退出（异常情况）
+                    // Host process exited before reporting Ready.
                     if (completedTask == processExitTask)
                     {
                         var exitCode = hostProcess.ExitCode;
-                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Host process exited unexpectedly with code: {exitCode}");
+                        Console.Error.WriteLine($"[LauncherFlowCoordinator] Host process exited before Ready. ExitCode={exitCode}.");
 
-                        // 关闭 Splash 窗口
+                        var recoveryResult = await TryRecoverFromEarlyHostExitAsync(
+                            exitCode,
+                            hostReadyTcs,
+                            splashWindow,
+                            loadingDetailsWindow).ConfigureAwait(false);
+                        if (recoveryResult is not null)
+                        {
+                            return recoveryResult;
+                        }
+
+                        // Close Splash window for unrecoverable early exits.
                         await Dispatcher.UIThread.InvokeAsync(() =>
                         {
                             try
@@ -288,6 +298,133 @@ internal sealed class LauncherFlowCoordinator
         }
     }
 
+    private async Task<LauncherResult?> TryRecoverFromEarlyHostExitAsync(
+        int exitCode,
+        TaskCompletionSource hostReadyTcs,
+        SplashWindow splashWindow,
+        LoadingDetailsWindow? loadingDetailsWindow)
+    {
+        if (exitCode == HostExitCodes.SecondaryActivationSucceeded)
+        {
+            Console.WriteLine("[LauncherFlowCoordinator] Host redirected activation to an existing primary instance.");
+            await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "launch",
+                Code = "activated_existing_instance",
+                Message = "Detected existing running instance and activation was acknowledged."
+            };
+        }
+
+        if (exitCode is not HostExitCodes.SecondaryActivationFailed and not HostExitCodes.RestartLockNotAcquired)
+        {
+            return null;
+        }
+
+        Console.Error.WriteLine(
+            $"[LauncherFlowCoordinator] Activation handshake failed with exit code {exitCode}. Retrying explicit activation once...");
+
+        var (retryLaunchResult, retryProcess) = await LaunchHostWithIpcAsync(splashWindow).ConfigureAwait(false);
+        if (!retryLaunchResult.Success)
+        {
+            return retryLaunchResult;
+        }
+
+        if (retryProcess is null)
+        {
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "activation_retry_start_failed",
+                Message = "Explicit activation retry failed because no host process was created."
+            };
+        }
+
+        Console.WriteLine($"[LauncherFlowCoordinator] Explicit activation retry started. RetryPid={retryProcess.Id}.");
+        var retryExitTask = retryProcess.WaitForExitAsync();
+        var retryCompleted = await Task.WhenAny(
+            hostReadyTcs.Task,
+            retryExitTask,
+            Task.Delay(TimeSpan.FromSeconds(15))).ConfigureAwait(false);
+
+        if (retryCompleted == hostReadyTcs.Task)
+        {
+            Console.WriteLine("[LauncherFlowCoordinator] Host reported Ready after explicit activation retry.");
+            await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+            return new LauncherResult
+            {
+                Success = true,
+                Stage = "launch",
+                Code = "activation_retry_ready",
+                Message = "Explicit activation retry succeeded and host reported Ready."
+            };
+        }
+
+        if (retryCompleted == retryExitTask)
+        {
+            var retryExitCode = retryProcess.ExitCode;
+            if (retryExitCode == HostExitCodes.SecondaryActivationSucceeded)
+            {
+                await CloseWindowsAsync(splashWindow, loadingDetailsWindow).ConfigureAwait(false);
+                return new LauncherResult
+                {
+                    Success = true,
+                    Stage = "launch",
+                    Code = "activation_retry_redirected",
+                    Message = "Explicit activation retry redirected to the existing primary instance."
+                };
+            }
+
+            return new LauncherResult
+            {
+                Success = false,
+                Stage = "launch",
+                Code = "activation_retry_failed",
+                Message = $"Explicit activation retry failed. ExitCode={retryExitCode}. 请结束残留后台进程后重试。"
+            };
+        }
+
+        return new LauncherResult
+        {
+            Success = false,
+            Stage = "launch",
+            Code = "activation_retry_timeout",
+            Message = "Explicit activation retry timed out before host became ready. 请结束残留后台进程后重试。"
+        };
+    }
+
+    private static async Task CloseWindowsAsync(SplashWindow splashWindow, LoadingDetailsWindow? loadingDetailsWindow)
+    {
+        await Dispatcher.UIThread.InvokeAsync(() =>
+        {
+            try
+            {
+                if (splashWindow.IsVisible && splashWindow.IsLoaded)
+                {
+                    splashWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to close splash window: {ex.Message}");
+            }
+
+            try
+            {
+                if (loadingDetailsWindow is not null && loadingDetailsWindow.IsVisible)
+                {
+                    loadingDetailsWindow.Close();
+                }
+            }
+            catch (Exception ex)
+            {
+                Console.Error.WriteLine($"[LauncherFlowCoordinator] Failed to close loading details window: {ex.Message}");
+            }
+        });
+    }
+
     private async Task<(LauncherResult Result, Process? Process)> LaunchHostWithIpcAsync(SplashWindow? splashWindow = null, string? customHostPath = null)
     {
         // 优先使用自定义路径（调试模式选择的路径）
@@ -377,6 +514,9 @@ internal sealed class LauncherFlowCoordinator
         processStartInfo.EnvironmentVariables[LauncherIpcConstants.CodenameEnvVar] = versionInfo.Codename;
 
         var hostProcess = Process.Start(processStartInfo);
+        Console.WriteLine(
+            $"[LauncherFlowCoordinator] Host launch requested. Path='{hostPath}'; WorkingDir='{hostWorkingDir}'; " +
+            $"Pid={(hostProcess is null ? -1 : hostProcess.Id)}; Args='{processStartInfo.Arguments}'.");
         return (new LauncherResult
         {
             Success = true,

LanMountainDesktop.Shared.Contracts/Launcher/HostExitCodes.cs

@@ -0,0 +1,18 @@
+namespace LanMountainDesktop.Shared.Contracts.Launcher;
+
+/// <summary>
+/// Standardized host process exit codes consumed by the launcher.
+/// </summary>
+public static class HostExitCodes
+{
+    public const int Success = 0;
+
+    // Secondary instance activated the existing primary instance successfully.
+    public const int SecondaryActivationSucceeded = 12;
+
+    // Secondary instance failed to activate the existing primary instance.
+    public const int SecondaryActivationFailed = 13;
+
+    // Restart relaunch couldn't acquire the single-instance lock in time.
+    public const int RestartLockNotAcquired = 14;
+}

LanMountainDesktop.Tests/SingleInstanceServiceTests.cs

@@ -0,0 +1,102 @@
+using System;
+using System.Reflection;
+using System.Threading;
+using System.Threading.Tasks;
+using LanMountainDesktop.Services;
+using Xunit;
+
+namespace LanMountainDesktop.Tests;
+
+public sealed class SingleInstanceServiceTests
+{
+    [Fact]
+    public async Task TryNotifyPrimaryInstance_ReturnsTrue_WhenPrimaryAcknowledges()
+    {
+        var mutexName = $"Local\\LanMountainDesktop.Tests.SingleInstance.{Guid.NewGuid():N}";
+        var pipeName = $"LanMountainDesktop.Tests.Activate.{Guid.NewGuid():N}";
+
+        using var primary = CreateService(mutexName, pipeName);
+        using var secondary = CreateSecondaryService(mutexName, pipeName);
+        Assert.True(primary.IsPrimaryInstance);
+        MarkAsSecondaryForTest(secondary);
+
+        var activated = new TaskCompletionSource(TaskCreationOptions.RunContinuationsAsynchronously);
+        primary.StartActivationListener(() => activated.TrySetResult());
+
+        var acknowledged = secondary.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2), out var failureReason);
+
+        Assert.True(acknowledged);
+        Assert.Null(failureReason);
+
+        var completed = await Task.WhenAny(activated.Task, Task.Delay(TimeSpan.FromSeconds(2)));
+        Assert.Same(activated.Task, completed);
+    }
+
+    [Fact]
+    public void TryNotifyPrimaryInstance_ReturnsFalse_WhenListenerIsNotRunning()
+    {
+        var mutexName = $"Local\\LanMountainDesktop.Tests.SingleInstance.{Guid.NewGuid():N}";
+        var pipeName = $"LanMountainDesktop.Tests.Activate.{Guid.NewGuid():N}";
+
+        using var primary = CreateService(mutexName, pipeName);
+        using var secondary = CreateSecondaryService(mutexName, pipeName);
+        Assert.True(primary.IsPrimaryInstance);
+        MarkAsSecondaryForTest(secondary);
+
+        var acknowledged = secondary.TryNotifyPrimaryInstance(TimeSpan.FromMilliseconds(300), out var failureReason);
+
+        Assert.False(acknowledged);
+        Assert.False(string.IsNullOrWhiteSpace(failureReason));
+    }
+
+    private static SingleInstanceService CreateService(string mutexName, string pipeName)
+    {
+        var ctor = typeof(SingleInstanceService).GetConstructor(
+            BindingFlags.Instance | BindingFlags.NonPublic,
+            binder: null,
+            [typeof(string), typeof(string)],
+            modifiers: null);
+
+        Assert.NotNull(ctor);
+        return (SingleInstanceService)ctor!.Invoke([mutexName, pipeName]);
+    }
+
+    private static SingleInstanceService CreateSecondaryService(string mutexName, string pipeName)
+    {
+        SingleInstanceService? created = null;
+        Exception? creationError = null;
+        var thread = new Thread(() =>
+        {
+            try
+            {
+                created = CreateService(mutexName, pipeName);
+            }
+            catch (Exception ex)
+            {
+                creationError = ex;
+            }
+        });
+
+        thread.IsBackground = true;
+        thread.Start();
+        thread.Join();
+
+        if (creationError is not null)
+        {
+            throw new InvalidOperationException("Failed to create secondary SingleInstanceService.", creationError);
+        }
+
+        Assert.NotNull(created);
+        return created!;
+    }
+
+    private static void MarkAsSecondaryForTest(SingleInstanceService service)
+    {
+        var ownsMutexField = typeof(SingleInstanceService).GetField(
+            "_ownsMutex",
+            BindingFlags.Instance | BindingFlags.NonPublic);
+        Assert.NotNull(ownsMutexField);
+        ownsMutexField!.SetValue(service, false);
+        Assert.False(service.IsPrimaryInstance);
+    }
+}

LanMountainDesktop/App.axaml.cs

@@ -77,6 +77,8 @@ public partial class App : Application
     private LauncherIpcClient? _launcherIpcClient;
     private LoadingStateManager? _loadingStateManager;
     private LoadingStateReporter? _loadingStateReporter;
+    private bool _singleInstanceReleased;
+    private int _forcedExitScheduled;
 
     internal static SingleInstanceService? CurrentSingleInstanceService { get; set; }
     internal static IHostApplicationLifecycle? CurrentHostApplicationLifecycle =>
@@ -290,16 +292,20 @@ public partial class App : Application
                 ReportStartupProgress(StartupStage.InitializingUI, 60, "正在初始化界面...");
                 CreateAndAssignMainWindow(desktop, "FrameworkInitialization");
             },
-            () =>
+            OnDesktopLifetimeExit,
-            {
-                AppLogger.Info("App", "Desktop lifetime exit triggered.");
-                PerformExitCleanup();
-            },
             () => CurrentSingleInstanceService?.StartActivationListener(ActivateMainWindow),
             StartWeatherLocationRefreshIfNeeded);
         _desktopShellHost.Initialize(this);
     }
 
+    private void OnDesktopLifetimeExit()
+    {
+        AppLogger.Info("App", "Desktop lifetime exit triggered.");
+        PerformExitCleanup();
+        ReleaseSingleInstanceAfterExit("DesktopLifetimeExit");
+        ScheduleForcedProcessTermination("DesktopLifetimeExit");
+    }
+
     private void OnTrayExitClick(object? sender, EventArgs e)
     {
         _ = _hostApplicationLifecycle.TryExit(new HostApplicationLifecycleRequest(
@@ -659,71 +665,103 @@ public partial class App : Application
 
     private void ActivateMainWindow()
     {
-        RestoreOrCreateMainWindow(showSingleInstanceNotice: true, source: "SingleInstance");
+        AppLogger.Info("SingleInstance", $"Activation callback received. Pid={Environment.ProcessId}.");
+
+        try
+        {
+            var restored = Dispatcher.UIThread.CheckAccess()
+                ? RestoreOrCreateMainWindowCore(showSingleInstanceNotice: true, source: "SingleInstance")
+                : Dispatcher.UIThread.InvokeAsync(
+                    () => RestoreOrCreateMainWindowCore(showSingleInstanceNotice: true, source: "SingleInstance"),
+                    DispatcherPriority.Send).GetAwaiter().GetResult();
+
+            if (!restored)
+            {
+                throw new InvalidOperationException("Main window restore failed in activation callback.");
+            }
+
+            AppLogger.Info("SingleInstance", "Activation callback completed successfully.");
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("SingleInstance", "Activation callback failed while restoring the desktop shell.", ex);
+            throw;
+        }
     }
 
     private void RestoreOrCreateMainWindow(bool showSingleInstanceNotice, string source)
     {
         Dispatcher.UIThread.Post(() =>
         {
-            if (ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop)
+            _ = RestoreOrCreateMainWindowCore(showSingleInstanceNotice, source);
-            {
-                return;
-            }
-
-            try
-            {
-                if (_transparentOverlayWindow is not null && _transparentOverlayWindow.IsVisible)
-                {
-                    _transparentOverlayWindow.Hide();
-                }
-
-                var mainWindow = GetOrCreateMainWindow(desktop, source);
-                mainWindow.PrepareEnterAnimation();
-
-                mainWindow.ShowInTaskbar = true;
-
-                if (!mainWindow.IsVisible)
-                {
-                    mainWindow.Show();
-                }
-
-                if (mainWindow.WindowState == WindowState.Minimized)
-                {
-                    mainWindow.WindowState = WindowState.Normal;
-                }
-
-                if (mainWindow.WindowState != WindowState.FullScreen)
-                {
-                    mainWindow.WindowState = WindowState.FullScreen;
-                }
-
-                mainWindow.Activate();
-                mainWindow.Topmost = true;
-                mainWindow.Topmost = false;
-
-                Dispatcher.UIThread.Post(() =>
-                {
-                    mainWindow.PlayEnterAnimation();
-                }, DispatcherPriority.Background);
-
-                SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"Restore:{source}");
-                AppLogger.Info(
-                    "DesktopShell",
-                    $"Desktop restored. Source='{source}'; MainWindowClosed={_mainWindowClosed}; ShowSingleInstanceNotice={showSingleInstanceNotice}; WindowState='{mainWindow.WindowState}'.");
-
-                if (showSingleInstanceNotice)
-                {
-                    mainWindow.ShowSingleInstanceNotice();
-                }
-            }
-            catch (Exception ex)
-            {
-                AppLogger.Warn("DesktopShell", $"Failed to restore desktop shell. Source='{source}'.", ex);
-            }
         }, DispatcherPriority.Send);
     }
 
+    private bool RestoreOrCreateMainWindowCore(bool showSingleInstanceNotice, string source)
+    {
+        if (ApplicationLifetime is not IClassicDesktopStyleApplicationLifetime desktop)
+        {
+            AppLogger.Warn("DesktopShell", $"Restore skipped because desktop lifetime is unavailable. Source='{source}'.");
+            return false;
+        }
+
+        try
+        {
+            AppLogger.Info("DesktopShell", $"Restoring desktop shell started. Source='{source}'.");
+
+            if (_transparentOverlayWindow is not null && _transparentOverlayWindow.IsVisible)
+            {
+                _transparentOverlayWindow.Hide();
+            }
+
+            var mainWindow = GetOrCreateMainWindow(desktop, source);
+            mainWindow.PrepareEnterAnimation();
+
+            mainWindow.ShowInTaskbar = true;
+
+            if (!mainWindow.IsVisible)
+            {
+                mainWindow.Show();
+            }
+
+            if (mainWindow.WindowState == WindowState.Minimized)
+            {
+                mainWindow.WindowState = WindowState.Normal;
+            }
+
+            if (mainWindow.WindowState != WindowState.FullScreen)
+            {
+                mainWindow.WindowState = WindowState.FullScreen;
+            }
+
+            mainWindow.Activate();
+            mainWindow.Topmost = true;
+            mainWindow.Topmost = false;
+
+            Dispatcher.UIThread.Post(() =>
+            {
+                mainWindow.PlayEnterAnimation();
+            }, DispatcherPriority.Background);
+
+            SetDesktopShellState(DesktopShellState.ForegroundDesktop, $"Restore:{source}");
+            AppLogger.Info(
+                "DesktopShell",
+                $"Desktop restored. Source='{source}'; MainWindowClosed={_mainWindowClosed}; ShowSingleInstanceNotice={showSingleInstanceNotice}; WindowState='{mainWindow.WindowState}'.");
+
+            if (showSingleInstanceNotice)
+            {
+                mainWindow.ShowSingleInstanceNotice();
+            }
+
+            return true;
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("DesktopShell", $"Failed to restore desktop shell. Source='{source}'.", ex);
+            return false;
+        }
+    }
+    
     private void EnsureTransparentOverlayWindow()
     {
         if (_transparentOverlayWindow is null)
@@ -885,6 +923,57 @@ public partial class App : Application
                stackTrace.Contains("AvaloniaWebView.WebView.OnAttachedToVisualTree", StringComparison.Ordinal);
     }
 
+    private void ReleaseSingleInstanceAfterExit(string source)
+    {
+        if (_singleInstanceReleased)
+        {
+            return;
+        }
+
+        _singleInstanceReleased = true;
+        var singleInstance = CurrentSingleInstanceService;
+        CurrentSingleInstanceService = null;
+        if (singleInstance is null)
+        {
+            AppLogger.Info("SingleInstance", $"No single-instance handle to release. Source='{source}'.");
+            return;
+        }
+
+        try
+        {
+            singleInstance.Dispose();
+            AppLogger.Info("SingleInstance", $"Released single-instance handle. Source='{source}'.");
+        }
+        catch (Exception ex)
+        {
+            AppLogger.Warn("SingleInstance", $"Failed to release single-instance handle. Source='{source}'.", ex);
+        }
+    }
+
+    private void ScheduleForcedProcessTermination(string source)
+    {
+        if (Interlocked.Exchange(ref _forcedExitScheduled, 1) != 0)
+        {
+            return;
+        }
+
+        _ = Task.Run(async () =>
+        {
+            try
+            {
+                await Task.Delay(TimeSpan.FromSeconds(8)).ConfigureAwait(false);
+                AppLogger.Warn(
+                    "DesktopShell",
+                    $"Process did not terminate after desktop exit cleanup. Forcing process exit. Source='{source}'; ShutdownIntent='{_shutdownIntent}'.");
+                Environment.Exit(0);
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DesktopShell", $"Forced process termination scheduler failed. Source='{source}'.", ex);
+            }
+        });
+    }
+
     private void PerformExitCleanup()
     {
         if (_exitCleanupCompleted)
@@ -935,6 +1024,22 @@ public partial class App : Application
             disposableRegistry.Dispose();
         }
 
+        if (_transparentOverlayWindow is not null)
+        {
+            try
+            {
+                _transparentOverlayWindow.Close();
+            }
+            catch (Exception ex)
+            {
+                AppLogger.Warn("DesktopShell", "Failed to close transparent overlay during exit cleanup.", ex);
+            }
+            finally
+            {
+                _transparentOverlayWindow = null;
+            }
+        }
+
         AudioRecorderServiceFactory.DisposeSharedServices();
         StudyAnalyticsServiceFactory.DisposeSharedService();
         DisposeTrayIcon();
@@ -1154,11 +1259,9 @@ public partial class App : Application
                 "DesktopShell",
                 $"Main window hidden to tray. Source='{source}'; WindowState='{mainWindow.WindowState}'.");
             
-            // 检查三指滑动功能是否启用
             var appSnapshot = _settingsFacade.Settings.LoadSnapshot<AppSettingsSnapshot>(SettingsScope.App);
-            if (appSnapshot.EnableThreeFingerSwipe)
+            if (appSnapshot.EnableThreeFingerSwipe && appSnapshot.EnableFusedDesktop)
             {
-                // 显示透明覆盖层窗口
                 EnsureTransparentOverlayWindow();
                 _transparentOverlayWindow?.Show();
             }

LanMountainDesktop/Program.cs

@@ -9,6 +9,7 @@ using LanMountainDesktop.Models;
 using LanMountainDesktop.Plugins;
 using LanMountainDesktop.Services;
 using LanMountainDesktop.Services.Settings;
+using LanMountainDesktop.Shared.Contracts.Launcher;
 
 namespace LanMountainDesktop;
 
@@ -32,11 +33,26 @@ public sealed class Program
                 AppLogger.Warn(
                     "Startup",
                     $"Restart relaunch could not acquire the single-instance lock. pid={restartParentProcessId.Value}. Suppressing multi-open activation prompt.");
+                Environment.ExitCode = HostExitCodes.RestartLockNotAcquired;
                 return;
             }
 
-            AppLogger.Warn("Startup", "A secondary launch was blocked because another instance is already running.");
+            var activationAcknowledged = singleInstance.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2), out var failureReason);
-            _ = singleInstance.TryNotifyPrimaryInstance(TimeSpan.FromSeconds(2));
+            if (activationAcknowledged)
+            {
+                AppLogger.Info(
+                    "Startup",
+                    $"Secondary launch forwarded to primary instance successfully. Acked={activationAcknowledged}; Pid={Environment.ProcessId}.");
+                Environment.ExitCode = HostExitCodes.SecondaryActivationSucceeded;
+            }
+            else
+            {
+                AppLogger.Warn(
+                    "Startup",
+                    $"Secondary launch failed to activate the primary instance. Acked={activationAcknowledged}; Reason='{failureReason ?? "unknown"}'; Pid={Environment.ProcessId}.");
+                Environment.ExitCode = HostExitCodes.SecondaryActivationFailed;
+            }
+
             return;
         }
 

LanMountainDesktop/Services/FusedDesktopManagerService.cs

@@ -117,8 +117,9 @@ internal sealed class FusedDesktopManagerService : IFusedDesktopManagerService
             
             if (_widgetWindows.TryGetValue(placement.PlacementId, out var existingWindow))
             {
-                // 已存在，可能只更新位置或尺寸
+                // 编辑完成后，已有小窗也要同步尺寸，否则会出现“布局已保存但窗口没变”的假象。
                 existingWindow.Position = new Avalonia.PixelPoint((int)placement.X, (int)placement.Y);
+                existingWindow.UpdateComponentLayout(placement.Width, placement.Height);
                 if (existingWindow.IsVisible == false)
                 {
                     existingWindow.Show();

LanMountainDesktop/Services/SingleInstanceService.cs

@@ -9,6 +9,10 @@ namespace LanMountainDesktop.Services;
 
 public sealed class SingleInstanceService : IDisposable
 {
+    private const byte ActivationRequestCode = 0x41; // 'A'
+    private const byte ActivationAckCode = 0x4B; // 'K'
+    private const byte ActivationNackCode = 0x4E; // 'N'
+
     private readonly Mutex _mutex;
     private readonly string _pipeName;
     private readonly CancellationTokenSource _listenCts = new();
@@ -56,13 +60,24 @@ public sealed class SingleInstanceService : IDisposable
             return;
         }
 
+        AppLogger.Info(
+            "SingleInstance",
+            $"Starting activation listener. Pipe='{_pipeName}'; Pid={Environment.ProcessId}; OwnsMutex={_ownsMutex}.");
         _listenTask = Task.Run(() => ListenForActivationAsync(onActivationRequested, _listenCts.Token));
     }
 
     public bool TryNotifyPrimaryInstance(TimeSpan timeout)
+    {
+        return TryNotifyPrimaryInstance(timeout, out _);
+    }
+
+    public bool TryNotifyPrimaryInstance(TimeSpan timeout, out string? failureReason)
     {
         if (_ownsMutex || _disposed)
         {
+            failureReason = _ownsMutex
+                ? "current_instance_is_primary"
+                : "single_instance_service_disposed";
             return false;
         }
 
@@ -71,16 +86,38 @@ public sealed class SingleInstanceService : IDisposable
             using var client = new NamedPipeClientStream(
                 serverName: ".",
                 pipeName: _pipeName,
-                direction: PipeDirection.Out,
+                direction: PipeDirection.InOut,
                 options: PipeOptions.Asynchronous);
 
             client.Connect((int)Math.Max(1, timeout.TotalMilliseconds));
-            client.WriteByte(1);
+            client.WriteByte(ActivationRequestCode);
             client.Flush();
+
+            var ack = client.ReadByte();
+            var acknowledged = ack == ActivationAckCode;
+            if (!acknowledged)
+            {
+                failureReason = ack switch
+                {
+                    ActivationNackCode => "primary_rejected_activation",
+                    -1 => "ack_not_received",
+                    _ => $"unexpected_ack_code_{ack}"
+                };
+                AppLogger.Warn(
+                    "SingleInstance",
+                    $"Primary activation handshake failed. AckCode={ack}; Reason='{failureReason}'; Pipe='{_pipeName}'; Pid={Environment.ProcessId}.");
+                return false;
+            }
+
+            failureReason = null;
+            AppLogger.Info(
+                "SingleInstance",
+                $"Primary activation acknowledged. Pipe='{_pipeName}'; Pid={Environment.ProcessId}.");
             return true;
         }
         catch (Exception ex)
         {
+            failureReason = "primary_activation_handshake_exception";
             AppLogger.Warn("SingleInstance", "Failed to notify the primary instance.", ex);
             return false;
         }
@@ -128,14 +165,40 @@ public sealed class SingleInstanceService : IDisposable
             {
                 using var server = new NamedPipeServerStream(
                     _pipeName,
-                    PipeDirection.In,
+                    PipeDirection.InOut,
                     1,
                     PipeTransmissionMode.Byte,
                     PipeOptions.Asynchronous);
 
                 await server.WaitForConnectionAsync(cancellationToken).ConfigureAwait(false);
-                await server.ReadAsync(new byte[1], cancellationToken).ConfigureAwait(false);
+                var buffer = new byte[1];
-                onActivationRequested();
+                var readBytes = await server.ReadAsync(buffer, cancellationToken).ConfigureAwait(false);
+                var isActivationRequest = readBytes == 1 && buffer[0] == ActivationRequestCode;
+                var ackCode = ActivationAckCode;
+
+                if (!isActivationRequest)
+                {
+                    ackCode = ActivationNackCode;
+                    AppLogger.Warn(
+                        "SingleInstance",
+                        $"Received malformed activation request. ReadBytes={readBytes}; Value={(readBytes == 1 ? buffer[0] : -1)}; Pipe='{_pipeName}'.");
+                }
+                else
+                {
+                    try
+                    {
+                        onActivationRequested();
+                    }
+                    catch (Exception ex)
+                    {
+                        ackCode = ActivationNackCode;
+                        AppLogger.Warn("SingleInstance", "Activation callback failed.", ex);
+                    }
+                }
+
+                var ackBuffer = new[] { ackCode };
+                await server.WriteAsync(ackBuffer, cancellationToken).ConfigureAwait(false);
+                await server.FlushAsync(cancellationToken).ConfigureAwait(false);
             }
             catch (OperationCanceledException)
             {

LanMountainDesktop/Views/DesktopWidgetWindow.axaml.cs

@@ -25,6 +25,23 @@ public partial class DesktopWidgetWindow : Window
         ComponentContainer.Child = componentContent;
     }
 
+    public void UpdateComponentLayout(double width, double height)
+    {
+        ComponentContainer.Width = width;
+        ComponentContainer.Height = height;
+
+        if (ComponentContainer.Child is Control child)
+        {
+            child.Width = width;
+            child.Height = height;
+        }
+
+        if (OperatingSystem.IsWindows() && IsVisible)
+        {
+            Dispatcher.UIThread.Post(UpdateInteractiveRegion, DispatcherPriority.Render);
+        }
+    }
+
     protected override void OnOpened(EventArgs e)
     {
         base.OnOpened(e);

LanMountainDesktop/Views/TransparentOverlayWindow.axaml.cs

@@ -23,6 +23,8 @@ namespace LanMountainDesktop.Views;
 public partial class TransparentOverlayWindow : Window
 {
     private readonly IFusedDesktopLayoutService _layoutService = FusedDesktopLayoutServiceProvider.GetOrCreate();
+    private readonly IWindowBottomMostService _bottomMostService = WindowBottomMostServiceFactory.GetOrCreate();
+    private readonly IRegionPassthroughService _regionPassthroughService = RegionPassthroughServiceFactory.GetOrCreate();
     
     // 滑动状态
     private bool _isSwipeActive;
@@ -77,6 +79,11 @@ public partial class TransparentOverlayWindow : Window
         _weatherDataService = facade.Weather.GetWeatherInfoService();
         _timeZoneService = facade.Region.GetTimeZoneService();
         _settingsFacade = facade;
+
+        if (OperatingSystem.IsWindows())
+        {
+            _bottomMostService.SetupBottomMost(this);
+        }
     }
     
     private readonly ISettingsFacadeService _settingsFacade;
@@ -84,6 +91,7 @@ public partial class TransparentOverlayWindow : Window
     public void SaveLayoutAndHide()
     {
         SaveLayout();
+        _regionPassthroughService.ClearInteractiveRegions(this);
         Hide();
         
         // Remove all components so that next time we open it builds fresh from snapshot
@@ -131,6 +139,11 @@ public partial class TransparentOverlayWindow : Window
         RenderAllComponents();
         
         AppLogger.Info("TransparentOverlay", $"Opened with {_layout.ComponentPlacements.Count} components.");
+
+        if (OperatingSystem.IsWindows())
+        {
+            _bottomMostService.SendToBottom(this);
+        }
     }
     
     /// <summary>
@@ -185,7 +198,25 @@ public partial class TransparentOverlayWindow : Window
     /// </summary>
     private void UpdateInteractiveRegions()
     {
-        // 编辑模式下不再需要底层穿透功能计算，这里留空或移除
+        _interactiveRegions.Clear();
+
+        foreach (var host in _componentHosts.Values)
+        {
+            var left = Canvas.GetLeft(host);
+            var top = Canvas.GetTop(host);
+            var width = host.Width > 0 ? host.Width : host.Bounds.Width;
+            var height = host.Height > 0 ? host.Height : host.Bounds.Height;
+
+            if (width <= 0 || height <= 0)
+            {
+                continue;
+            }
+
+            // 稍微向外扩一圈，确保拖拽和右下角缩放手柄也能命中。
+            _interactiveRegions.Add(new Rect(left - 12, top - 12, width + 24, height + 24));
+        }
+
+        _regionPassthroughService.SetInteractiveRegions(this, _interactiveRegions);
     }
     
     /// <summary>