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/ViewModels/MainViewModel.cs

@@ -0,0 +1,178 @@
+using System.Collections.ObjectModel;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.Extensions.DependencyInjection;
+using PersonalToolBox.Helpers;
+using PersonalToolBox.Models;
+using PersonalToolBox.Services;
+using PersonalToolBox.Views;
+
+namespace PersonalToolBox.ViewModels;
+
+/// <summary>
+/// 主窗口 ViewModel，管理 UI 状态、数据绑定和用户交互逻辑
+/// </summary>
+public partial class MainViewModel : ObservableObject
+{
+    private readonly ILogService _logService;
+    private readonly IDataService _dataService;
+    private readonly IProcessExecutionService _processService;
+    private readonly IServiceProvider _serviceProvider;
+
+    /// <summary>
+    /// 全部分类的虚拟对象
+    /// </summary>
+    private static readonly Category AllCategory = new() { Id = "", Name = "全部" };
+
+    public MainViewModel(
+        ILogService logService,
+        IDataService dataService,
+        IProcessExecutionService processService,
+        IServiceProvider serviceProvider)
+    {
+        _logService = logService;
+        _dataService = dataService;
+        _processService = processService;
+        _serviceProvider = serviceProvider;
+
+        LoadData();
+    }
+
+    // ───────────────────────────── 可观察属性 ─────────────────────────────
+
+    [ObservableProperty]
+    private string _searchText = string.Empty;
+
+    [ObservableProperty]
+    private Category? _selectedCategory;
+
+    public ObservableCollection<LogEntry> Logs => _logService.Logs;
+
+    public ObservableCollection<Category> Categories { get; } = new();
+
+    public ObservableCollection<ToolItem> Tools { get; } = new();
+
+    [ObservableProperty]
+    private ObservableCollection<ToolItem> _filteredTools = new();
+
+    [ObservableProperty]
+    private string _currentTheme = "Dark";
+
+    // ───────────────────────────── 命令 ─────────────────────────────
+
+    [RelayCommand]
+    private void ClearLogs() => _logService.Clear();
+
+    [RelayCommand]
+    private void ToggleTheme()
+    {
+        CurrentTheme = CurrentTheme == "Dark" ? "Light" : "Dark";
+        ThemeHelper.ApplyTheme(CurrentTheme);
+        _dataService.Config.Theme = CurrentTheme;
+        _dataService.Save();
+        _logService.Info($"已切换到{(CurrentTheme == "Dark" ? "暗黑" : "明亮")}主题");
+    }
+
+    /// <summary>
+    /// 打开添加工具弹窗
+    /// </summary>
+    [RelayCommand]
+    private void AddTool()
+    {
+        var vm = _serviceProvider.GetRequiredService<ToolEditViewModel>();
+        var window = new ToolEditWindow(vm);
+        window.ShowDialog();
+
+        if (vm.Saved)
+        {
+            RefreshData();
+        }
+    }
+
+    /// <summary>
+    /// 打开编辑工具弹窗
+    /// </summary>
+    [RelayCommand]
+    private void EditTool(ToolItem tool)
+    {
+        if (tool == null) return;
+
+        // 创建编辑 ViewModel（需要新建实例，DI 容器无法区分参数）
+        var dataService = _serviceProvider.GetRequiredService<IDataService>();
+        var logService = _serviceProvider.GetRequiredService<ILogService>();
+        var editVm = new ToolEditViewModel(dataService, logService, tool);
+        var window = new ToolEditWindow(editVm);
+        window.ShowDialog();
+
+        if (editVm.Saved)
+        {
+            RefreshData();
+        }
+    }
+
+    /// <summary>
+    /// 执行工具（双击卡片或右键菜单）
+    /// </summary>
+    [RelayCommand]
+    private void ExecuteTool(ToolItem? tool)
+    {
+        if (tool == null) return;
+        _processService.Execute(tool);
+    }
+
+    // ───────────────────────────── 数据刷新 ─────────────────────────────
+
+    /// <summary>
+    /// 从配置重新加载数据并刷新 UI
+    /// </summary>
+    public void RefreshData()
+    {
+        var previousCategoryId = SelectedCategory?.Id;
+
+        Categories.Clear();
+        Categories.Add(AllCategory);
+
+        foreach (var cat in _dataService.Config.Categories)
+            Categories.Add(cat);
+
+        Tools.Clear();
+        foreach (var tool in _dataService.Config.Tools)
+            Tools.Add(tool);
+
+        // 恢复之前选中的分类（若仍存在），否则选中"全部"
+        SelectedCategory = Categories.FirstOrDefault(c => c.Id == previousCategoryId) ?? AllCategory;
+        ApplyFilter();
+    }
+
+    // ───────────────────────────── 初始化 ─────────────────────────────
+
+    private void LoadData()
+    {
+        RefreshData();
+
+        SelectedCategory = AllCategory;
+        CurrentTheme = _dataService.Config.Theme;
+        ThemeHelper.ApplyTheme(CurrentTheme);
+    }
+
+    // ───────────────────────────── 过滤逻辑 ─────────────────────────────
+
+    partial void OnSearchTextChanged(string value) => ApplyFilter();
+
+    partial void OnSelectedCategoryChanged(Category? value) => ApplyFilter();
+
+    private void ApplyFilter()
+    {
+        var filtered = Tools.AsEnumerable();
+
+        if (SelectedCategory != null && !string.IsNullOrEmpty(SelectedCategory.Id))
+            filtered = filtered.Where(t => t.CategoryId == SelectedCategory.Id);
+
+        if (!string.IsNullOrWhiteSpace(SearchText))
+            filtered = filtered.Where(t =>
+                t.Name.Contains(SearchText, System.StringComparison.OrdinalIgnoreCase));
+
+        FilteredTools = new ObservableCollection<ToolItem>(filtered);
+    }
+}