diff --git a/LanMountainDesktop/App.axaml.cs b/LanMountainDesktop/App.axaml.cs
index 924b43b..57b592a 100644
--- a/LanMountainDesktop/App.axaml.cs
+++ b/LanMountainDesktop/App.axaml.cs
@@ -1199,6 +1199,7 @@ public partial class App : Application
 
         try
         {
+            TelemetryServices.Usage?.TrackSessionEnded("App.PerformExitCleanup");
             TelemetryServices.Usage?.Shutdown(
                 _shutdownIntent == ShutdownIntent.RestartRequested,
                 "App.PerformExitCleanup");
diff --git a/LanMountainDesktop/Models/DesktopComponentPlacementSnapshot.cs b/LanMountainDesktop/Models/DesktopComponentPlacementSnapshot.cs
index 2791cd5..436199f 100644
--- a/LanMountainDesktop/Models/DesktopComponentPlacementSnapshot.cs
+++ b/LanMountainDesktop/Models/DesktopComponentPlacementSnapshot.cs
@@ -1,4 +1,4 @@
-namespace LanMountainDesktop.Models;
+namespace LanMountainDesktop.Models;
 
 public sealed class DesktopComponentPlacementSnapshot
 {
@@ -7,7 +7,7 @@ public sealed class DesktopComponentPlacementSnapshot
     public int PageIndex { get; set; }
 
     public string ComponentId { get; set; } = string.Empty;
-
+    public string ComponentName { get; set; } = string.Empty;
     public int Row { get; set; }
 
     public int Column { get; set; }
diff --git a/LanMountainDesktop/Services/PostHogUsageTelemetryService.cs b/LanMountainDesktop/Services/PostHogUsageTelemetryService.cs
index 2d13678..df739ab 100644
--- a/LanMountainDesktop/Services/PostHogUsageTelemetryService.cs
+++ b/LanMountainDesktop/Services/PostHogUsageTelemetryService.cs
@@ -103,57 +103,57 @@ public sealed class PostHogUsageTelemetryService : IDisposable
     public void TrackMainWindowOpened(string source, bool isVisible, string windowState)
     {
         CaptureEvent(
-            "main_window_opened",
+            TelemetryEventNames.MainWindowOpened,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
                 ["is_visible"] = isVisible,
                 ["window_state"] = windowState
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackMainWindowClosed(string source, bool wasVisible, string windowState)
     {
         CaptureEvent(
-            "main_window_closed",
+            TelemetryEventNames.MainWindowClosed,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
                 ["was_visible"] = wasVisible,
                 ["window_state"] = windowState
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackSettingsWindowOpened(string source, string? currentPageId)
     {
         CaptureEvent(
-            "settings_window_opened",
+            TelemetryEventNames.SettingsWindowOpened,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
                 ["current_page_id"] = currentPageId
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackSettingsWindowClosed(string source, string? currentPageId)
     {
         CaptureEvent(
-            "settings_window_closed",
+            TelemetryEventNames.SettingsWindowClosed,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
                 ["current_page_id"] = currentPageId
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackSettingsNavigation(string? fromPageId, string? toPageId, string source)
     {
         CaptureEvent(
-            "settings_navigation",
+            TelemetryEventNames.SettingsNavigation,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
@@ -167,37 +167,37 @@ public sealed class PostHogUsageTelemetryService : IDisposable
     public void TrackSettingsDrawerOpened(string? pageId, string? drawerTitle)
     {
         CaptureEvent(
-            "settings_drawer_opened",
+            TelemetryEventNames.SettingsDrawerOpened,
             new Dictionary<string, object?>
             {
                 ["page_id"] = pageId,
                 ["drawer_title"] = drawerTitle
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackSettingsDrawerClosed(string? pageId, string? drawerTitle)
     {
         CaptureEvent(
-            "settings_drawer_closed",
+            TelemetryEventNames.SettingsDrawerClosed,
             new Dictionary<string, object?>
             {
                 ["page_id"] = pageId,
                 ["drawer_title"] = drawerTitle
             },
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackDesktopComponentPlaced(DesktopComponentPlacementSnapshot placement, string source)
     {
         CaptureEvent(
-            "desktop_component_placed",
+            TelemetryEventNames.DesktopComponentPlaced,
             new Dictionary<string, object?>
             {
                 ["source"] = source
             },
             stateAfter: DescribePlacement(placement),
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackDesktopComponentMoved(
@@ -206,14 +206,14 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         string source)
     {
         CaptureEvent(
-            "desktop_component_moved",
+            TelemetryEventNames.DesktopComponentMoved,
             new Dictionary<string, object?>
             {
                 ["source"] = source
             },
             stateBefore: DescribePlacement(before),
             stateAfter: DescribePlacement(after),
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackDesktopComponentResized(
@@ -222,38 +222,38 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         string source)
     {
         CaptureEvent(
-            "desktop_component_resized",
+            TelemetryEventNames.DesktopComponentResized,
             new Dictionary<string, object?>
             {
                 ["source"] = source
             },
             stateBefore: DescribePlacement(before),
             stateAfter: DescribePlacement(after),
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackDesktopComponentDeleted(DesktopComponentPlacementSnapshot before, string source)
     {
         CaptureEvent(
-            "desktop_component_deleted",
+            TelemetryEventNames.DesktopComponentDeleted,
             new Dictionary<string, object?>
             {
                 ["source"] = source
             },
             stateBefore: DescribePlacement(before),
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackDesktopComponentEditorOpened(DesktopComponentPlacementSnapshot placement, string source)
     {
         CaptureEvent(
-            "desktop_component_editor_opened",
+            TelemetryEventNames.DesktopComponentEditorOpened,
             new Dictionary<string, object?>
             {
                 ["source"] = source
             },
             stateBefore: DescribePlacement(placement),
-            forceFlush: true);
+            forceFlush: false);
     }
 
     public void TrackSessionStarted(string source)
@@ -310,24 +310,29 @@ public sealed class PostHogUsageTelemetryService : IDisposable
                 return;
             }
 
-            var distinctId = identity.InstallId;
+            var distinctId = identity.TelemetryId;
             var personProps = new Dictionary<string, object?>
             {
                 ["install_id"] = identity.InstallId,
+                ["telemetry_id"] = identity.TelemetryId,
                 ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
                 ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
                 ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
                 ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
                 ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
                 ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
-                ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage()
+                ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage(),
+                ["os_build"] = TelemetryEnvironmentInfo.GetOsBuild(),
+                ["clr_version"] = TelemetryEnvironmentInfo.GetClrVersion(),
+                ["language_display_name"] = TelemetryEnvironmentInfo.GetSystemLanguageDisplayName(),
+                ["render_mode"] = TelemetryEnvironmentInfo.GetRenderMode()
             };
 
             _ = _client.IdentifyAsync(distinctId, personProps, null, _cts.Token);
 
             _client.Capture(
                 distinctId,
-                "app_first_launch",
+                TelemetryEventNames.AppFirstLaunch,
                 personProps,
                 groups: null,
                 sendFeatureFlags: false);
@@ -360,7 +365,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         _sequence = 0;
 
         CaptureEvent(
-            "app_session_start",
+            TelemetryEventNames.AppSessionStart,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
@@ -368,12 +373,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
                 ["session_start_utc"] = _sessionStartUtc.ToString("o"),
                 ["local_hour"] = _sessionStartUtc.ToLocalTime().Hour,
                 ["day_part"] = TelemetryEnvironmentInfo.GetLocalDayPart(_sessionStartUtc),
-                ["timezone"] = TimeZoneInfo.Local.Id,
-                ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
-                ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
-                ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
-                ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
-                ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture()
+                ["timezone"] = TimeZoneInfo.Local.Id
             },
             forceFlush: true);
 
@@ -391,7 +391,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         var durationMs = Math.Max(0, (long)(endUtc - _sessionStartUtc).TotalMilliseconds);
 
         CaptureEvent(
-            "app_session_end",
+            TelemetryEventNames.AppSessionEnd,
             new Dictionary<string, object?>
             {
                 ["source"] = source,
@@ -456,20 +456,14 @@ public sealed class PostHogUsageTelemetryService : IDisposable
             ["session_id"] = _sessionId,
             ["sequence"] = seq,
             ["timestamp_utc"] = DateTimeOffset.UtcNow.ToString("o"),
-            ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
-            ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
-            ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
-            ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
-            ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
-            ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
-            ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage()
+            ["event_display_name"] = TelemetryEventNames.DisplayName(eventName)
         };
 
         if (payload is not null)
         {
             foreach (var kvp in payload)
             {
-                properties[$"payload_{kvp.Key}"] = kvp.Value;
+                properties[kvp.Key] = kvp.Value;
             }
         }
 
@@ -516,6 +510,7 @@ public sealed class PostHogUsageTelemetryService : IDisposable
         {
             ["placement_id"] = placement.PlacementId,
             ["component_id"] = placement.ComponentId,
+            ["component_name"] = placement.ComponentName ?? placement.ComponentId,
             ["page_index"] = placement.PageIndex,
             ["row"] = placement.Row,
             ["column"] = placement.Column,
diff --git a/LanMountainDesktop/Services/SentryCrashTelemetryService.cs b/LanMountainDesktop/Services/SentryCrashTelemetryService.cs
index c2b7ac8..c38c474 100644
--- a/LanMountainDesktop/Services/SentryCrashTelemetryService.cs
+++ b/LanMountainDesktop/Services/SentryCrashTelemetryService.cs
@@ -104,7 +104,7 @@ public sealed class SentryCrashTelemetryService : IDisposable
 
         var eventId = SentrySdk.CaptureException(exception, scope =>
         {
-            ApplyCommonScope(scope, source, "unhandled_exception", includeLogTail: true);
+            ApplyCommonScope(scope, source, TelemetryEventNames.SentryUnhandledException, includeLogTail: true);
             scope.Level = isTerminating ? SentryLevel.Fatal : SentryLevel.Error;
             scope.SetTag("exception_source", source);
             scope.SetTag("is_terminating", isTerminating.ToString());
@@ -136,7 +136,7 @@ public sealed class SentryCrashTelemetryService : IDisposable
 
         var eventId = SentrySdk.CaptureException(exception, scope =>
         {
-            ApplyCommonScope(scope, source, "task_exception", includeLogTail: true);
+            ApplyCommonScope(scope, source, TelemetryEventNames.SentryTaskException, includeLogTail: true);
             scope.Level = SentryLevel.Error;
             scope.SetTag("exception_source", source);
         });
@@ -155,9 +155,9 @@ public sealed class SentryCrashTelemetryService : IDisposable
             }
         }
 
-        var eventId = SentrySdk.CaptureMessage("application_shutdown", scope =>
+        var eventId = SentrySdk.CaptureMessage(TelemetryEventNames.SentryShutdown, scope =>
         {
-            ApplyCommonScope(scope, source, "shutdown", includeLogTail: true);
+            ApplyCommonScope(scope, source, TelemetryEventNames.SentryShutdown, includeLogTail: true);
             scope.Level = SentryLevel.Info;
             scope.SetTag("shutdown_intent", isRestart ? "restart" : "exit");
             scope.SetExtra("shutdown_intent", isRestart ? "restart" : "exit");
@@ -209,7 +209,7 @@ public sealed class SentryCrashTelemetryService : IDisposable
             options.Dsn = SentryDsn;
             options.AutoSessionTracking = true;
             options.AttachStacktrace = true;
-            options.SendDefaultPii = true;
+            options.SendDefaultPii = false;
             options.MaxBreadcrumbs = 100;
             options.Release = TelemetryEnvironmentInfo.GetAppVersion();
             options.Environment = TelemetryEnvironmentInfo.GetEnvironment();
@@ -293,27 +293,19 @@ public sealed class SentryCrashTelemetryService : IDisposable
 
         scope.User = new SentryUser
         {
-            Id = telemetryId,
-            IpAddress = AutoIpAddress
+            Id = telemetryId
         };
 
         scope.SetTag("telemetry_channel", "sentry");
         scope.SetTag("event_type", eventType);
+        scope.SetTag("event_display_name", TelemetryEventNames.DisplayName(eventType));
         scope.SetTag("source", source);
-        scope.SetTag("install_id", installId);
-        scope.SetTag("telemetry_id", telemetryId);
         scope.SetTag("app_version", TelemetryEnvironmentInfo.GetAppVersion());
         scope.SetTag("environment", TelemetryEnvironmentInfo.GetEnvironment());
         scope.SetTag("os_name", TelemetryEnvironmentInfo.GetOsName());
         scope.SetTag("os_version", TelemetryEnvironmentInfo.GetOsVersion());
-        scope.SetTag("os_build", TelemetryEnvironmentInfo.GetOsBuild());
-        scope.SetTag("device_model", TelemetryEnvironmentInfo.GetDeviceModel());
-        scope.SetTag("device_arch", TelemetryEnvironmentInfo.GetDeviceArchitecture());
-        scope.SetTag("processor_count", TelemetryEnvironmentInfo.GetProcessorCount().ToString());
-        scope.SetTag("total_memory_mb", TelemetryEnvironmentInfo.GetTotalMemoryMB().ToString());
-        scope.SetTag("runtime_version", TelemetryEnvironmentInfo.GetRuntimeVersion());
-        scope.SetTag("clr_version", TelemetryEnvironmentInfo.GetClrVersion());
         scope.SetTag("language", TelemetryEnvironmentInfo.GetSystemLanguage());
+
         scope.SetExtra("install_id", installId);
         scope.SetExtra("telemetry_id", telemetryId);
         scope.SetExtra("app_version", TelemetryEnvironmentInfo.GetAppVersion());
@@ -328,6 +320,8 @@ public sealed class SentryCrashTelemetryService : IDisposable
         scope.SetExtra("runtime_version", TelemetryEnvironmentInfo.GetRuntimeVersion());
         scope.SetExtra("clr_version", TelemetryEnvironmentInfo.GetClrVersion());
         scope.SetExtra("language", TelemetryEnvironmentInfo.GetSystemLanguage());
+        scope.SetExtra("language_display_name", TelemetryEnvironmentInfo.GetSystemLanguageDisplayName());
+        scope.SetExtra("render_mode", TelemetryEnvironmentInfo.GetRenderMode());
         scope.SetExtra("log_file_path", AppLogger.LogFilePath);
 
         if (includeLogTail)
diff --git a/LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs b/LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs
index 05c8506..4964e25 100644
--- a/LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs
+++ b/LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs
@@ -127,7 +127,37 @@ internal static class TelemetryEnvironmentInfo
 
     public static string GetClrVersion()
     {
-        return Environment.Version.ToString();
+        try
+        {
+            return System.Runtime.InteropServices.RuntimeEnvironment.GetSystemVersion() ?? "Unknown";
+        }
+        catch
+        {
+            return "Unknown";
+        }
+    }
+
+    public static string GetSystemLanguageDisplayName()
+    {
+        try
+        {
+            var culture = CultureInfo.CurrentUICulture;
+            return culture.NativeName ?? culture.Name ?? "Unknown";
+        }
+        catch
+        {
+            return "Unknown";
+        }
+    }
+
+    public static string GetRenderMode()
+    {
+        return Program.StartupRenderMode ?? "Unknown";
+    }
+
+    public static string GetScreenInfo()
+    {
+        return "requires_ui_thread";
     }
 
     public static string GetLocalDayPart(DateTimeOffset timestamp)
diff --git a/LanMountainDesktop/Services/TelemetryEventNames.cs b/LanMountainDesktop/Services/TelemetryEventNames.cs
new file mode 100644
index 0000000..a4185f0
--- /dev/null
+++ b/LanMountainDesktop/Services/TelemetryEventNames.cs
@@ -0,0 +1,69 @@
+using System.Collections.Generic;
+
+namespace LanMountainDesktop.Services;
+
+internal static class TelemetryEventNames
+{
+    internal static string DisplayName(string eventName) =>
+        EventDisplayNames.TryGetValue(eventName, out var displayName)
+            ? displayName
+            : eventName;
+
+    internal const string AppFirstLaunch = "app_first_launch";
+    internal const string AppSessionStart = "app_session_start";
+    internal const string AppSessionEnd = "app_session_end";
+    internal const string MainWindowOpened = "main_window_opened";
+    internal const string MainWindowClosed = "main_window_closed";
+    internal const string SettingsWindowOpened = "settings_window_opened";
+    internal const string SettingsWindowClosed = "settings_window_closed";
+    internal const string SettingsNavigation = "settings_navigation";
+    internal const string SettingsDrawerOpened = "settings_drawer_opened";
+    internal const string SettingsDrawerClosed = "settings_drawer_closed";
+    internal const string DesktopComponentPlaced = "desktop_component_placed";
+    internal const string DesktopComponentMoved = "desktop_component_moved";
+    internal const string DesktopComponentResized = "desktop_component_resized";
+    internal const string DesktopComponentDeleted = "desktop_component_deleted";
+    internal const string DesktopComponentEditorOpened = "desktop_component_editor_opened";
+    internal const string ThemeChanged = "theme_changed";
+    internal const string PluginInstalled = "plugin_installed";
+    internal const string PluginUninstalled = "plugin_uninstalled";
+    internal const string PluginEnabled = "plugin_enabled";
+    internal const string PluginDisabled = "plugin_disabled";
+    internal const string UpdateChecked = "update_checked";
+    internal const string UpdateInstalled = "update_installed";
+    internal const string AppCrash = "app_crash";
+
+    internal const string SentryUnhandledException = "unhandled_exception";
+    internal const string SentryTaskException = "task_exception";
+    internal const string SentryShutdown = "shutdown";
+
+    private static readonly Dictionary<string, string> EventDisplayNames = new()
+    {
+        [AppFirstLaunch] = "应用首次启动",
+        [AppSessionStart] = "会话开始",
+        [AppSessionEnd] = "会话结束",
+        [MainWindowOpened] = "主窗口打开",
+        [MainWindowClosed] = "主窗口关闭",
+        [SettingsWindowOpened] = "设置窗口打开",
+        [SettingsWindowClosed] = "设置窗口关闭",
+        [SettingsNavigation] = "设置页导航",
+        [SettingsDrawerOpened] = "设置抽屉打开",
+        [SettingsDrawerClosed] = "设置抽屉关闭",
+        [DesktopComponentPlaced] = "桌面组件放置",
+        [DesktopComponentMoved] = "桌面组件移动",
+        [DesktopComponentResized] = "桌面组件缩放",
+        [DesktopComponentDeleted] = "桌面组件删除",
+        [DesktopComponentEditorOpened] = "组件编辑器打开",
+        [ThemeChanged] = "主题变更",
+        [PluginInstalled] = "插件安装",
+        [PluginUninstalled] = "插件卸载",
+        [PluginEnabled] = "插件启用",
+        [PluginDisabled] = "插件禁用",
+        [UpdateChecked] = "更新检查",
+        [UpdateInstalled] = "更新安装",
+        [AppCrash] = "应用崩溃",
+        [SentryUnhandledException] = "未处理异常",
+        [SentryTaskException] = "任务异常",
+        [SentryShutdown] = "应用关闭"
+    };
+}
diff --git a/LanMountainDesktop/Views/MainWindow.ComponentSystem.cs b/LanMountainDesktop/Views/MainWindow.ComponentSystem.cs
index 9fd030b..eaf6658 100644
--- a/LanMountainDesktop/Views/MainWindow.ComponentSystem.cs
+++ b/LanMountainDesktop/Views/MainWindow.ComponentSystem.cs
@@ -1536,6 +1536,7 @@ public partial class MainWindow : Window
             PlacementId = placement.PlacementId,
             PageIndex = placement.PageIndex,
             ComponentId = placement.ComponentId,
+            ComponentName = placement.ComponentName,
             Row = placement.Row,
             Column = placement.Column,
             WidthCells = placement.WidthCells,
diff --git a/LanMountainDesktop/Views/MainWindow.axaml.cs b/LanMountainDesktop/Views/MainWindow.axaml.cs
index 630f9ef..ecfcb03 100644
--- a/LanMountainDesktop/Views/MainWindow.axaml.cs
+++ b/LanMountainDesktop/Views/MainWindow.axaml.cs
@@ -517,6 +517,7 @@ public partial class MainWindow : Window
             "MainWindow.OnOpened",
             IsVisible,
             WindowState.ToString());
+        TelemetryServices.Usage?.TrackSessionStarted("MainWindow.OnOpened");
         DesktopHost.SizeChanged += OnDesktopHostSizeChanged;
         RebuildDesktopGrid();
         LoadLauncherEntriesAsync();
diff --git a/docs/superpowers/plans/2026-05-26-telemetry-normalization.md b/docs/superpowers/plans/2026-05-26-telemetry-normalization.md
new file mode 100644
index 0000000..b324fae
--- /dev/null
+++ b/docs/superpowers/plans/2026-05-26-telemetry-normalization.md
@@ -0,0 +1,810 @@
+# 遥测系统规范化改进实施计划
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** 修复 Sentry/PostHog 遥测系统的数据一致性问题，添加中文可读标签，规范化上报数据格式，补充缺失业务事件。
+
+**Architecture:** 保持现有三个服务（SentryCrashTelemetryService、PostHogUsageTelemetryService、TelemetryIdentityService）的架构不变，在各服务内部进行数据修复和增强。新增 TelemetryEventNames 静态类统一管理事件名和中文显示名，新增 TelemetryEnvironmentInfo 增强方法。
+
+**Tech Stack:** C# / .NET 8 / Sentry 6.4.1 / PostHog 2.6.0 / Avalonia UI
+
+---
+
+## 文件变更地图
+
+| 文件 | 操作 | 职责 |
+|------|------|------|
+| `LanMountainDesktop/Services/TelemetryEventNames.cs` | **新建** | 统一管理所有事件名和中文显示名 |
+| `LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs` | 修改 | 增强环境信息采集、修复重复方法 |
+| `LanMountainDesktop/Services/SentryCrashTelemetryService.cs` | 修改 | 修复 Tags/Extras 冗余、添加中文标签、修复 PII、增加业务上下文 |
+| `LanMountainDesktop/Services/PostHogUsageTelemetryService.cs` | 修改 | 修复 distinct_id 不一致、修复 Session 生命周期、添加中文标签、优化 Flush、增强 DescribePlacement |
+| `LanMountainDesktop/Views/MainWindow.axaml.cs` | 修改 | 添加 Session 生命周期调用 |
+| `LanMountainDesktop/App.axaml.cs` | 修改 | 添加 Session 结束调用 |
+
+---
+
+## Task 1: 新建 TelemetryEventNames 统一事件名管理
+
+**Files:**
+- Create: `LanMountainDesktop/Services/TelemetryEventNames.cs`
+
+- [ ] **Step 1: 创建 TelemetryEventNames.cs**
+
+```csharp
+using System.Collections.Generic;
+
+namespace LanMountainDesktop.Services;
+
+internal static class TelemetryEventNames
+{
+    internal static string DisplayName(string eventName) =>
+        EventDisplayNames.TryGetValue(eventName, out var displayName)
+            ? displayName
+            : eventName;
+
+    internal const string AppFirstLaunch = "app_first_launch";
+    internal const string AppSessionStart = "app_session_start";
+    internal const string AppSessionEnd = "app_session_end";
+    internal const string MainWindowOpened = "main_window_opened";
+    internal const string MainWindowClosed = "main_window_closed";
+    internal const string SettingsWindowOpened = "settings_window_opened";
+    internal const string SettingsWindowClosed = "settings_window_closed";
+    internal const string SettingsNavigation = "settings_navigation";
+    internal const string SettingsDrawerOpened = "settings_drawer_opened";
+    internal const string SettingsDrawerClosed = "settings_drawer_closed";
+    internal const string DesktopComponentPlaced = "desktop_component_placed";
+    internal const string DesktopComponentMoved = "desktop_component_moved";
+    internal const string DesktopComponentResized = "desktop_component_resized";
+    internal const string DesktopComponentDeleted = "desktop_component_deleted";
+    internal const string DesktopComponentEditorOpened = "desktop_component_editor_opened";
+    internal const string ThemeChanged = "theme_changed";
+    internal const string PluginInstalled = "plugin_installed";
+    internal const string PluginUninstalled = "plugin_uninstalled";
+    internal const string PluginEnabled = "plugin_enabled";
+    internal const string PluginDisabled = "plugin_disabled";
+    internal const string UpdateChecked = "update_checked";
+    internal const string UpdateInstalled = "update_installed";
+    internal const string AppCrash = "app_crash";
+
+    internal const string SentryUnhandledException = "unhandled_exception";
+    internal const string SentryTaskException = "task_exception";
+    internal const string SentryShutdown = "shutdown";
+
+    private static readonly Dictionary<string, string> EventDisplayNames = new()
+    {
+        [AppFirstLaunch] = "应用首次启动",
+        [AppSessionStart] = "会话开始",
+        [AppSessionEnd] = "会话结束",
+        [MainWindowOpened] = "主窗口打开",
+        [MainWindowClosed] = "主窗口关闭",
+        [SettingsWindowOpened] = "设置窗口打开",
+        [SettingsWindowClosed] = "设置窗口关闭",
+        [SettingsNavigation] = "设置页导航",
+        [SettingsDrawerOpened] = "设置抽屉打开",
+        [SettingsDrawerClosed] = "设置抽屉关闭",
+        [DesktopComponentPlaced] = "桌面组件放置",
+        [DesktopComponentMoved] = "桌面组件移动",
+        [DesktopComponentResized] = "桌面组件缩放",
+        [DesktopComponentDeleted] = "桌面组件删除",
+        [DesktopComponentEditorOpened] = "组件编辑器打开",
+        [ThemeChanged] = "主题变更",
+        [PluginInstalled] = "插件安装",
+        [PluginUninstalled] = "插件卸载",
+        [PluginEnabled] = "插件启用",
+        [PluginDisabled] = "插件禁用",
+        [UpdateChecked] = "更新检查",
+        [UpdateInstalled] = "更新安装",
+        [AppCrash] = "应用崩溃",
+        [SentryUnhandledException] = "未处理异常",
+        [SentryTaskException] = "任务异常",
+        [SentryShutdown] = "应用关闭"
+    };
+}
+```
+
+---
+
+## Task 2: 增强 TelemetryEnvironmentInfo
+
+**Files:**
+- Modify: `LanMountainDesktop/Services/TelemetryEnvironmentInfo.cs`
+
+- [ ] **Step 1: 修复 GetClrVersion 重复问题，增加 GetScreenInfo、GetRenderMode、GetSystemLanguageDisplayName**
+
+在 `TelemetryEnvironmentInfo.cs` 中：
+
+1. 修改 `GetClrVersion()` 使其返回实际的 CLR 信息而非与 `GetRuntimeVersion()` 重复：
+
+```csharp
+public static string GetClrVersion()
+{
+    try
+    {
+        return System.Runtime.InteropServices.RuntimeEnvironment.GetSystemVersion() ?? "Unknown";
+    }
+    catch
+    {
+        return "Unknown";
+    }
+}
+```
+
+2. 新增 `GetScreenInfo()` 方法：
+
+```csharp
+public static string GetScreenInfo()
+{
+    try
+    {
+        var screenList = new List<string>();
+        foreach (var screen in Avalonia.Controls.Screens.All)
+        {
+            screenList.Add($"{screen.Bounds.Width}x{screen.Bounds.Height}@{screen.Scaling:F1}x");
+        }
+        return screenList.Count > 0 ? string.Join("; ", screenList) : "Unknown";
+    }
+    catch
+    {
+        return "Unknown";
+    }
+}
+```
+
+注意：由于 `TelemetryEnvironmentInfo` 是 `internal static` 类且可能在 UI 线程之外调用，`Screens` API 需要 UI 线程。因此改用更安全的方式：
+
+```csharp
+public static string GetScreenInfo()
+{
+    return "requires_ui_thread";
+}
+```
+
+并提供一个可从 UI 线程调用的重载：
+
+```csharp
+public static string GetScreenInfoFromUiThread(Avalonia.Controls.TopLevel? topLevel)
+{
+    try
+    {
+        var screens = topLevel?.Screens;
+        if (screens is null)
+        {
+            return "Unknown";
+        }
+
+        var screenList = new List<string>();
+        foreach (var screen in screens.All)
+        {
+            screenList.Add($"{screen.Bounds.Width}x{screen.Bounds.Height}@{screen.Scaling:F1}x");
+        }
+        return screenList.Count > 0 ? string.Join("; ", screenList) : "Unknown";
+    }
+    catch
+    {
+        return "Unknown";
+    }
+}
+```
+
+3. 新增 `GetSystemLanguageDisplayName()` 方法：
+
+```csharp
+public static string GetSystemLanguageDisplayName()
+{
+    try
+    {
+        var culture = CultureInfo.CurrentUICulture;
+        return culture.NativeName ?? culture.Name ?? "Unknown";
+    }
+    catch
+    {
+        return "Unknown";
+    }
+}
+```
+
+4. 新增 `GetRenderMode()` 方法：
+
+```csharp
+public static string GetRenderMode()
+{
+    return Program.StartupRenderMode ?? "Unknown";
+}
+```
+
+注意：`Program.StartupRenderMode` 已是 `internal static`，同项目内可直接访问。
+
+---
+
+## Task 3: 修复 SentryCrashTelemetryService — Tags/Extras 冗余、中文标签、PII、业务上下文
+
+**Files:**
+- Modify: `LanMountainDesktop/Services/SentryCrashTelemetryService.cs`
+
+- [ ] **Step 1: 修改 EnableSentry 方法 — 关闭 SendDefaultPii**
+
+将第 212 行：
+```csharp
+options.SendDefaultPii = true;
+```
+改为：
+```csharp
+options.SendDefaultPii = false;
+```
+
+- [ ] **Step 2: 重写 ApplyCommonScope 方法 — 消除 Tags/Extras 冗余，添加中文标签和业务上下文**
+
+将整个 `ApplyCommonScope` 方法（第 289-346 行）替换为：
+
+```csharp
+private void ApplyCommonScope(Scope scope, string source, string eventType, bool includeLogTail)
+{
+    var installId = TelemetryIdentityService.Instance.InstallId;
+    var telemetryId = TelemetryIdentityService.Instance.TelemetryId;
+
+    scope.User = new SentryUser
+    {
+        Id = telemetryId
+    };
+
+    scope.SetTag("telemetry_channel", "sentry");
+    scope.SetTag("event_type", eventType);
+    scope.SetTag("event_display_name", TelemetryEventNames.DisplayName(eventType));
+    scope.SetTag("source", source);
+    scope.SetTag("app_version", TelemetryEnvironmentInfo.GetAppVersion());
+    scope.SetTag("environment", TelemetryEnvironmentInfo.GetEnvironment());
+    scope.SetTag("os_name", TelemetryEnvironmentInfo.GetOsName());
+    scope.SetTag("os_version", TelemetryEnvironmentInfo.GetOsVersion());
+    scope.SetTag("language", TelemetryEnvironmentInfo.GetSystemLanguage());
+
+    scope.SetExtra("install_id", installId);
+    scope.SetExtra("telemetry_id", telemetryId);
+    scope.SetExtra("app_version", TelemetryEnvironmentInfo.GetAppVersion());
+    scope.SetExtra("environment", TelemetryEnvironmentInfo.GetEnvironment());
+    scope.SetExtra("os_name", TelemetryEnvironmentInfo.GetOsName());
+    scope.SetExtra("os_version", TelemetryEnvironmentInfo.GetOsVersion());
+    scope.SetExtra("os_build", TelemetryEnvironmentInfo.GetOsBuild());
+    scope.SetExtra("device_model", TelemetryEnvironmentInfo.GetDeviceModel());
+    scope.SetExtra("device_arch", TelemetryEnvironmentInfo.GetDeviceArchitecture());
+    scope.SetExtra("processor_count", TelemetryEnvironmentInfo.GetProcessorCount());
+    scope.SetExtra("total_memory_mb", TelemetryEnvironmentInfo.GetTotalMemoryMB());
+    scope.SetExtra("runtime_version", TelemetryEnvironmentInfo.GetRuntimeVersion());
+    scope.SetExtra("clr_version", TelemetryEnvironmentInfo.GetClrVersion());
+    scope.SetExtra("language", TelemetryEnvironmentInfo.GetSystemLanguage());
+    scope.SetExtra("language_display_name", TelemetryEnvironmentInfo.GetSystemLanguageDisplayName());
+    scope.SetExtra("render_mode", TelemetryEnvironmentInfo.GetRenderMode());
+    scope.SetExtra("log_file_path", AppLogger.LogFilePath);
+
+    if (includeLogTail)
+    {
+        var logTail = ReadLogTail(maxLines: 200, maxCharacters: 32_768);
+        if (!string.IsNullOrWhiteSpace(logTail))
+        {
+            scope.SetExtra("log_tail", logTail);
+            scope.SetExtra("log_tail_line_count", logTail.Count(character => character == '\n') + 1);
+            scope.AddAttachment(
+                Encoding.UTF8.GetBytes(logTail),
+                "log-tail.txt",
+                contentType: "text/plain");
+        }
+    }
+}
+```
+
+关键变更：
+- Tags 只保留用于过滤/索引的核心字段（6 个），移除 `install_id`、`telemetry_id`、`os_build`、`device_model`、`device_arch`、`processor_count`、`total_memory_mb`、`runtime_version`、`clr_version` 等非索引字段
+- Extras 保留所有详细上下文信息
+- 新增 `event_display_name` Tag（中文显示名）
+- 新增 `language_display_name`、`render_mode` Extra
+- 移除 `IpAddr = AutoIpAddress`（配合 SendDefaultPii = false）
+
+- [ ] **Step 3: 修改 CaptureUnhandledException 方法 — 使用 TelemetryEventNames 常量**
+
+将第 107 行：
+```csharp
+ApplyCommonScope(scope, source, "unhandled_exception", includeLogTail: true);
+```
+改为：
+```csharp
+ApplyCommonScope(scope, source, TelemetryEventNames.SentryUnhandledException, includeLogTail: true);
+```
+
+- [ ] **Step 4: 修改 CaptureTaskException 方法 — 使用 TelemetryEventNames 常量**
+
+将第 139 行：
+```csharp
+ApplyCommonScope(scope, source, "task_exception", includeLogTail: true);
+```
+改为：
+```csharp
+ApplyCommonScope(scope, source, TelemetryEventNames.SentryTaskException, includeLogTail: true);
+```
+
+- [ ] **Step 5: 修改 CaptureShutdown 方法 — 使用 TelemetryEventNames 常量**
+
+将第 160 行：
+```csharp
+ApplyCommonScope(scope, source, "shutdown", includeLogTail: true);
+```
+改为：
+```csharp
+ApplyCommonScope(scope, source, TelemetryEventNames.SentryShutdown, includeLogTail: true);
+```
+
+同时将第 158 行的硬编码消息：
+```csharp
+var eventId = SentrySdk.CaptureMessage("application_shutdown", scope =>
+```
+改为：
+```csharp
+var eventId = SentrySdk.CaptureMessage(TelemetryEventNames.SentryShutdown, scope =>
+```
+
+---
+
+## Task 4: 修复 PostHogUsageTelemetryService — distinct_id 不一致、Session 生命周期、中文标签、Flush 优化、DescribePlacement 增强
+
+**Files:**
+- Modify: `LanMountainDesktop/Services/PostHogUsageTelemetryService.cs`
+
+- [ ] **Step 1: 修复 EnsureBaselineEventSent — 统一使用 telemetryId 作为 distinct_id**
+
+将第 314 行：
+```csharp
+var distinctId = identity.InstallId;
+```
+改为：
+```csharp
+var distinctId = identity.TelemetryId;
+```
+
+同时将 personProps 中增加 `install_id`（保留为属性但不再作为 distinct_id）：
+
+将 personProps 定义（第 314-324 行）改为：
+```csharp
+var distinctId = identity.TelemetryId;
+var personProps = new Dictionary<string, object?>
+{
+    ["install_id"] = identity.InstallId,
+    ["telemetry_id"] = identity.TelemetryId,
+    ["app_version"] = TelemetryEnvironmentInfo.GetAppVersion(),
+    ["os_name"] = TelemetryEnvironmentInfo.GetOsName(),
+    ["os_version"] = TelemetryEnvironmentInfo.GetOsVersion(),
+    ["os_build"] = TelemetryEnvironmentInfo.GetOsBuild(),
+    ["device_model"] = TelemetryEnvironmentInfo.GetDeviceModel(),
+    ["device_arch"] = TelemetryEnvironmentInfo.GetDeviceArchitecture(),
+    ["runtime_version"] = TelemetryEnvironmentInfo.GetRuntimeVersion(),
+    ["clr_version"] = TelemetryEnvironmentInfo.GetClrVersion(),
+    ["language"] = TelemetryEnvironmentInfo.GetSystemLanguage(),
+    ["language_display_name"] = TelemetryEnvironmentInfo.GetSystemLanguageDisplayName(),
+    ["render_mode"] = TelemetryEnvironmentInfo.GetRenderMode()
+};
+```
+
+同时将 `app_first_launch` 事件名改为使用常量：
+
+将第 329 行：
+```csharp
+"app_first_launch",
+```
+改为：
+```csharp
+TelemetryEventNames.AppFirstLaunch,
+```
+
+- [ ] **Step 2: 修复 CaptureEvent — 添加中文 event_display_name，优化环境信息重复**
+
+将整个 `CaptureEvent` 方法（第 436-503 行）替换为：
+
+```csharp
+private void CaptureEvent(
+    string eventName,
+    IReadOnlyDictionary<string, object?>? payload = null,
+    IReadOnlyDictionary<string, object?>? stateBefore = null,
+    IReadOnlyDictionary<string, object?>? stateAfter = null,
+    bool forceFlush = false)
+{
+    if (!_isInitialized || !_isUsageEnabled || !_sessionActive)
+    {
+        return;
+    }
+
+    var identity = TelemetryIdentityService.Instance;
+    var distinctId = identity.TelemetryId;
+    var seq = Interlocked.Increment(ref _sequence);
+
+    var properties = new Dictionary<string, object?>(StringComparer.OrdinalIgnoreCase)
+    {
+        ["install_id"] = identity.InstallId,
+        ["telemetry_id"] = identity.TelemetryId,
+        ["session_id"] = _sessionId,
+        ["sequence"] = seq,
+        ["timestamp_utc"] = DateTimeOffset.UtcNow.ToString("o"),
+        ["event_display_name"] = TelemetryEventNames.DisplayName(eventName)
+    };
+
+    if (payload is not null)
+    {
+        foreach (var kvp in payload)
+        {
+            properties[kvp.Key] = kvp.Value;
+        }
+    }
+
+    if (stateBefore is not null && stateBefore.Count > 0)
+    {
+        foreach (var kvp in stateBefore)
+        {
+            properties[$"state_before_{kvp.Key}"] = kvp.Value;
+        }
+    }
+
+    if (stateAfter is not null && stateAfter.Count > 0)
+    {
+        foreach (var kvp in stateAfter)
+        {
+            properties[$"state_after_{kvp.Key}"] = kvp.Value;
+        }
+    }
+
+    _client.Capture(
+        distinctId,
+        eventName,
+        properties,
+        groups: null,
+        sendFeatureFlags: false);
+
+    if (forceFlush)
+    {
+        _ = _client.FlushAsync();
+    }
+}
+```
+
+关键变更：
+- 移除每个事件中重复的 `app_version`、`os_name`、`os_version`、`device_model`、`device_arch`、`runtime_version`、`language`（这些已通过 Identify 设置为 person properties）
+- 添加 `event_display_name` 属性（中文显示名）
+- 移除 `payload_` 前缀，payload 属性直接使用原始 key
+
+- [ ] **Step 3: 修复 StartSession — 使用 TelemetryEventNames 常量，移除重复环境信息**
+
+将 StartSession 方法中的 CaptureEvent 调用（第 362-378 行）改为：
+
+```csharp
+CaptureEvent(
+    TelemetryEventNames.AppSessionStart,
+    new Dictionary<string, object?>
+    {
+        ["source"] = source,
+        ["launch_id"] = _launchId,
+        ["session_start_utc"] = _sessionStartUtc.ToString("o"),
+        ["local_hour"] = _sessionStartUtc.ToLocalTime().Hour,
+        ["day_part"] = TelemetryEnvironmentInfo.GetLocalDayPart(_sessionStartUtc),
+        ["timezone"] = TimeZoneInfo.Local.Id
+    },
+    forceFlush: true);
+```
+
+- [ ] **Step 4: 修复 EndSession — 使用 TelemetryEventNames 常量**
+
+将 EndSession 方法中的 CaptureEvent 调用（第 393-404 行）改为：
+
+```csharp
+CaptureEvent(
+    TelemetryEventNames.AppSessionEnd,
+    new Dictionary<string, object?>
+    {
+        ["source"] = source,
+        ["launch_id"] = _launchId,
+        ["session_start_utc"] = _sessionStartUtc.ToString("o"),
+        ["session_end_utc"] = endUtc.ToString("o"),
+        ["duration_ms"] = durationMs,
+        ["is_restart"] = isRestart
+    },
+    forceFlush: true);
+```
+
+- [ ] **Step 5: 修改所有 Track* 方法 — 使用 TelemetryEventNames 常量，移除 payload_ 前缀影响**
+
+将所有 Track 方法中的硬编码事件名替换为常量引用：
+
+`TrackMainWindowOpened`（第 105-114 行）：
+```csharp
+public void TrackMainWindowOpened(string source, bool isVisible, string windowState)
+{
+    CaptureEvent(
+        TelemetryEventNames.MainWindowOpened,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source,
+            ["is_visible"] = isVisible,
+            ["window_state"] = windowState
+        },
+        forceFlush: true);
+}
+```
+
+`TrackMainWindowClosed`（第 116-127 行）：
+```csharp
+public void TrackMainWindowClosed(string source, bool wasVisible, string windowState)
+{
+    CaptureEvent(
+        TelemetryEventNames.MainWindowClosed,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source,
+            ["was_visible"] = wasVisible,
+            ["window_state"] = windowState
+        },
+        forceFlush: true);
+}
+```
+
+`TrackSettingsWindowOpened`（第 129-139 行）：
+```csharp
+public void TrackSettingsWindowOpened(string source, string? currentPageId)
+{
+    CaptureEvent(
+        TelemetryEventNames.SettingsWindowOpened,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source,
+            ["current_page_id"] = currentPageId
+        },
+        forceFlush: true);
+}
+```
+
+`TrackSettingsWindowClosed`（第 141-151 行）：
+```csharp
+public void TrackSettingsWindowClosed(string source, string? currentPageId)
+{
+    CaptureEvent(
+        TelemetryEventNames.SettingsWindowClosed,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source,
+            ["current_page_id"] = currentPageId
+        },
+        forceFlush: true);
+}
+```
+
+`TrackSettingsNavigation`（第 153-165 行）：
+```csharp
+public void TrackSettingsNavigation(string? fromPageId, string? toPageId, string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.SettingsNavigation,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source,
+            ["from_page_id"] = fromPageId,
+            ["to_page_id"] = toPageId
+        },
+        stateBefore: CreatePageState(fromPageId),
+        stateAfter: CreatePageState(toPageId));
+}
+```
+
+`TrackSettingsDrawerOpened`（第 167-177 行）：
+```csharp
+public void TrackSettingsDrawerOpened(string? pageId, string? drawerTitle)
+{
+    CaptureEvent(
+        TelemetryEventNames.SettingsDrawerOpened,
+        new Dictionary<string, object?>
+        {
+            ["page_id"] = pageId,
+            ["drawer_title"] = drawerTitle
+        },
+        forceFlush: true);
+}
+```
+
+`TrackSettingsDrawerClosed`（第 179-189 行）：
+```csharp
+public void TrackSettingsDrawerClosed(string? pageId, string? drawerTitle)
+{
+    CaptureEvent(
+        TelemetryEventNames.SettingsDrawerClosed,
+        new Dictionary<string, object?>
+        {
+            ["page_id"] = pageId,
+            ["drawer_title"] = drawerTitle
+        },
+        forceFlush: true);
+}
+```
+
+`TrackDesktopComponentPlaced`（第 191-201 行）：
+```csharp
+public void TrackDesktopComponentPlaced(DesktopComponentPlacementSnapshot placement, string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.DesktopComponentPlaced,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source
+        },
+        stateAfter: DescribePlacement(placement),
+        forceFlush: true);
+}
+```
+
+`TrackDesktopComponentMoved`（第 203-217 行）：
+```csharp
+public void TrackDesktopComponentMoved(
+    DesktopComponentPlacementSnapshot before,
+    DesktopComponentPlacementSnapshot after,
+    string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.DesktopComponentMoved,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source
+        },
+        stateBefore: DescribePlacement(before),
+        stateAfter: DescribePlacement(after),
+        forceFlush: true);
+}
+```
+
+`TrackDesktopComponentResized`（第 219-233 行）：
+```csharp
+public void TrackDesktopComponentResized(
+    DesktopComponentPlacementSnapshot before,
+    DesktopComponentPlacementSnapshot after,
+    string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.DesktopComponentResized,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source
+        },
+        stateBefore: DescribePlacement(before),
+        stateAfter: DescribePlacement(after),
+        forceFlush: true);
+}
+```
+
+`TrackDesktopComponentDeleted`（第 235-245 行）：
+```csharp
+public void TrackDesktopComponentDeleted(DesktopComponentPlacementSnapshot before, string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.DesktopComponentDeleted,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source
+        },
+        stateBefore: DescribePlacement(before),
+        forceFlush: true);
+}
+```
+
+`TrackDesktopComponentEditorOpened`（第 247-257 行）：
+```csharp
+public void TrackDesktopComponentEditorOpened(DesktopComponentPlacementSnapshot placement, string source)
+{
+    CaptureEvent(
+        TelemetryEventNames.DesktopComponentEditorOpened,
+        new Dictionary<string, object?>
+        {
+            ["source"] = source
+        },
+        stateBefore: DescribePlacement(placement),
+        forceFlush: true);
+}
+```
+
+- [ ] **Step 6: 增强 DescribePlacement — 添加 component_name**
+
+将 `DescribePlacement` 方法（第 513-525 行）改为：
+
+```csharp
+private static IReadOnlyDictionary<string, object?> DescribePlacement(DesktopComponentPlacementSnapshot placement)
+{
+    return new Dictionary<string, object?>
+    {
+        ["placement_id"] = placement.PlacementId,
+        ["component_id"] = placement.ComponentId,
+        ["component_name"] = placement.ComponentName ?? placement.ComponentId,
+        ["page_index"] = placement.PageIndex,
+        ["row"] = placement.Row,
+        ["column"] = placement.Column,
+        ["width_cells"] = placement.WidthCells,
+        ["height_cells"] = placement.HeightCells
+    };
+}
+```
+
+注意：这要求 `DesktopComponentPlacementSnapshot` 有 `ComponentName` 属性。如果不存在，需要在 `DesktopComponentPlacementSnapshot.cs` 中添加：
+
+```csharp
+public string ComponentName { get; set; } = string.Empty;
+```
+
+并在创建 placement snapshot 的地方（`ClonePlacementSnapshot` 方法等）填充该字段。
+
+- [ ] **Step 7: 优化 Flush 策略 — 仅关键事件 forceFlush**
+
+将以下 Track 方法的 `forceFlush: true` 改为 `forceFlush: false`（仅保留 session 和 first_launch 的 forceFlush）：
+
+- `TrackMainWindowOpened` → `forceFlush: false`
+- `TrackMainWindowClosed` → `forceFlush: false`
+- `TrackSettingsWindowOpened` → `forceFlush: false`
+- `TrackSettingsWindowClosed` → `forceFlush: false`
+- `TrackSettingsDrawerOpened` → `forceFlush: false`
+- `TrackSettingsDrawerClosed` → `forceFlush: false`
+- `TrackDesktopComponentPlaced` → `forceFlush: false`
+- `TrackDesktopComponentMoved` → `forceFlush: false`
+- `TrackDesktopComponentResized` → `forceFlush: false`
+- `TrackDesktopComponentDeleted` → `forceFlush: false`
+- `TrackDesktopComponentEditorOpened` → `forceFlush: false`
+
+保留 `forceFlush: true` 的：
+- `StartSession`（app_session_start）
+- `EndSession`（app_session_end）
+- `EnsureBaselineEventSent`（app_first_launch）
+
+---
+
+## Task 5: 修复 Session 生命周期 — MainWindow 和 App 层调用
+
+**Files:**
+- Modify: `LanMountainDesktop/Views/MainWindow.axaml.cs`
+- Modify: `LanMountainDesktop/App.axaml.cs`
+
+- [ ] **Step 1: 在 MainWindow.OnOpened 中添加 TrackSessionStarted 调用**
+
+在 `MainWindow.axaml.cs` 的 `OnOpened` 方法中，在 `TrackMainWindowOpened` 调用之后（约第 519 行），添加：
+
+```csharp
+TelemetryServices.Usage?.TrackSessionStarted("MainWindow.OnOpened");
+```
+
+- [ ] **Step 2: 在 App.PerformExitCleanup 中确保 TrackSessionEnded 被调用**
+
+在 `App.axaml.cs` 的 `PerformExitCleanup` 方法中，在 `TelemetryServices.Usage?.Shutdown(...)` 调用之前（约第 1202 行），添加：
+
+```csharp
+TelemetryServices.Usage?.TrackSessionEnded("App.PerformExitCleanup");
+```
+
+---
+
+## Task 6: 为 DesktopComponentPlacementSnapshot 添加 ComponentName 属性
+
+**Files:**
+- Modify: `LanMountainDesktop/Models/DesktopComponentPlacementSnapshot.cs`
+
+- [ ] **Step 1: 添加 ComponentName 属性**
+
+在 `DesktopComponentPlacementSnapshot.cs` 中，在 `ComponentId` 属性之后添加：
+
+```csharp
+public string ComponentName { get; set; } = string.Empty;
+```
+
+- [ ] **Step 2: 搜索所有 ClonePlacementSnapshot 方法，确保 ComponentName 被正确填充**
+
+在 `MainWindow.ComponentSystem.cs` 和 `MainWindow.DesktopEditing.cs` 中的 `ClonePlacementSnapshot` 方法里，需要确保 `ComponentName` 被赋值。搜索项目中所有 `ClonePlacementSnapshot` 的实现，在克隆时同时复制 `ComponentName` 字段。
+
+---
+
+## Task 7: 构建验证
+
+- [ ] **Step 1: 执行 dotnet build 确保编译通过**
+
+Run: `dotnet build LanMountainDesktop.slnx -c Debug`
+
+Expected: Build succeeded, 0 errors
+
+- [ ] **Step 2: 执行 dotnet test 确保测试通过**
+
+Run: `dotnet test LanMountainDesktop.slnx -c Debug`
+
+Expected: All tests pass