Phase 2-3: UI layout, theme switching, CRUD tools, process execution

- Phase 2: MainWindow 3-section layout (sidebar/content/log bar), Dark/Light theme with ThemeHelper, MainViewModel with ObservableProperty/RelayCommand, tool card filtering by search + category

- Phase 3: ToolEditWindow for add/edit tools, ProcessExecutionService (Process.Start + error handling), double-click + right-click context menu (run/edit), path browse dialog

- Bugfix: ContextMenu commands now use PlacementTarget.Tag binding (ContextMenu in separate visual tree)

- Bugfix: StaticResource converters moved to XAML before DataTemplate to fix XamlParseException on tool card render

- Bugfix: Pure filenames (no path separators) treated as PATH commands, not marked invalid

- Bugfix: RefreshData preserves SelectedCategory; Load() catches all exceptions; Save() wrapped in try-catch; auto-scroll log to newest entry

- Tests: xUnit project with 55 tests covering models, services, converters, and view models

PersonalToolBox/App.xaml.cs

@@ -1,5 +1,6 @@
-using Microsoft.Extensions.DependencyInjection;
+using System.IO;
 using System.Windows;
+using Microsoft.Extensions.DependencyInjection;
 using PersonalToolBox.Services;
 using PersonalToolBox.Views;
 
@@ -12,34 +13,81 @@ public partial class App : Application
 {
     public static IServiceProvider Services { get; private set; } = null!;
 
+    private static readonly string CrashLogPath = Path.Combine(
+        Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
+        "PersonalToolBox", "crash.log");
+
+    public App()
+    {
+        // 监听未处理的异常，写入文件日志
+        DispatcherUnhandledException += (s, e) =>
+        {
+            WriteCrashLog($"UI线程异常: {e.Exception}");
+            e.Handled = true;
+            MessageBox.Show($"发生未处理异常:\n{e.Exception.Message}\n\n详情已写入:\n{CrashLogPath}",
+                "错误", MessageBoxButton.OK, MessageBoxImage.Error);
+        };
+
+        AppDomain.CurrentDomain.UnhandledException += (s, e) =>
+        {
+            WriteCrashLog($"未处理异常: {e.ExceptionObject}");
+        };
+    }
+
     protected override void OnStartup(StartupEventArgs e)
     {
-        base.OnStartup(e);
+        try
+        {
+            base.OnStartup(e);
 
-        var services = new ServiceCollection();
-        ConfigureServices(services);
-        Services = services.BuildServiceProvider();
+            var services = new ServiceCollection();
+            ConfigureServices(services);
+            Services = services.BuildServiceProvider();
 
-        // 启动时加载配置文件（含路径验证与容错）
-        var dataService = Services.GetRequiredService<IDataService>();
-        dataService.Load();
+            // 启动时加载配置文件（含路径验证与容错）
+            var dataService = Services.GetRequiredService<IDataService>();
+            dataService.Load();
 
-        var mainWindow = Services.GetRequiredService<MainWindow>();
-        mainWindow.Show();
+            var mainWindow = Services.GetRequiredService<MainWindow>();
+            mainWindow.Show();
+        }
+        catch (Exception ex)
+        {
+            WriteCrashLog($"启动失败: {ex}");
+            MessageBox.Show($"启动失败:\n{ex.Message}\n\n详情已写入:\n{CrashLogPath}",
+                "启动错误", MessageBoxButton.OK, MessageBoxImage.Error);
+            Shutdown();
+        }
     }
 
     /// <summary>
-    /// 注册所有服务到 DI 容器（单例模式）
+    /// 注册所有服务到 DI 容器
     /// </summary>
     private static void ConfigureServices(IServiceCollection services)
     {
-        // 日志服务
         services.AddSingleton<ILogService, LogService>();
-
-        // 数据持久化服务
         services.AddSingleton<IDataService, JsonDataService>();
-
-        // 主窗口
+        services.AddSingleton<IProcessExecutionService, ProcessExecutionService>();
+        services.AddSingleton<ViewModels.MainViewModel>();
+        services.AddTransient<ViewModels.ToolEditViewModel>();
         services.AddSingleton<MainWindow>();
     }
+
+    /// <summary>
+    /// 将崩溃信息写入文件日志
+    /// </summary>
+    public static void WriteCrashLog(string message)
+    {
+        try
+        {
+            var dir = Path.GetDirectoryName(CrashLogPath);
+            if (dir != null) Directory.CreateDirectory(dir);
+            File.AppendAllText(CrashLogPath,
+                $"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] {message}{Environment.NewLine}{Environment.NewLine}");
+        }
+        catch
+        {
+            // 无法写入日志时静默忽略
+        }
+    }
 }