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/ToolEditViewModel.cs

@@ -0,0 +1,191 @@
+using System.Collections.ObjectModel;
+using System.IO;
+using System.Linq;
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using Microsoft.Win32;
+using PersonalToolBox.Models;
+using PersonalToolBox.Services;
+
+namespace PersonalToolBox.ViewModels;
+
+/// <summary>
+/// 工具编辑窗口 ViewModel，管理添加/编辑工具的交互逻辑
+/// </summary>
+public partial class ToolEditViewModel : ObservableObject
+{
+    private readonly IDataService _dataService;
+    private readonly ILogService _logService;
+    private readonly ToolItem? _editingTool;
+
+    // ───────────────────────────── 可观察属性 ─────────────────────────────
+
+    [ObservableProperty]
+    private string _windowTitle = "添加工具";
+
+    [ObservableProperty]
+    private string _name = string.Empty;
+
+    [ObservableProperty]
+    private string _executablePath = string.Empty;
+
+    [ObservableProperty]
+    private string _arguments = string.Empty;
+
+    [ObservableProperty]
+    private string _hotKey = string.Empty;
+
+    [ObservableProperty]
+    private Category? _selectedCategory;
+
+    /// <summary>
+    /// 分类下拉列表
+    /// </summary>
+    public ObservableCollection<Category> Categories { get; } = new();
+
+    /// <summary>
+    /// 窗口关闭回调（由 View 层设置）
+    /// </summary>
+    public Action<bool?>? CloseAction { get; set; }
+
+    /// <summary>
+    /// 是否保存成功（供调用方判断是否需要刷新）
+    /// </summary>
+    public bool Saved { get; private set; }
+
+    // ───────────────────────────── 构造函数 ─────────────────────────────
+
+    public ToolEditViewModel(IDataService dataService, ILogService logService, ToolItem? toolToEdit = null)
+    {
+        _dataService = dataService;
+        _logService = logService;
+        _editingTool = toolToEdit;
+
+        // 加载分类列表
+        foreach (var cat in _dataService.Config.Categories)
+            Categories.Add(cat);
+
+        // 编辑模式
+        if (toolToEdit != null)
+        {
+            WindowTitle = "编辑工具";
+            Name = toolToEdit.Name;
+            ExecutablePath = toolToEdit.ExecutablePath;
+            Arguments = toolToEdit.Arguments;
+            HotKey = toolToEdit.HotKey;
+            SelectedCategory = Categories.FirstOrDefault(c => c.Id == toolToEdit.CategoryId);
+        }
+    }
+
+    // ───────────────────────────── 命令 ─────────────────────────────
+
+    /// <summary>
+    /// 浏览本地文件
+    /// </summary>
+    [RelayCommand]
+    private void BrowseFile()
+    {
+        var dialog = new OpenFileDialog
+        {
+            Title = "选择可执行文件或脚本",
+            Filter = "所有文件|*.*|可执行文件|*.exe|脚本文件|*.bat;*.cmd;*.ps1;*.py|快捷方式|*.lnk"
+        };
+
+        if (dialog.ShowDialog() == true)
+        {
+            ExecutablePath = dialog.FileName;
+            if (string.IsNullOrWhiteSpace(Name))
+            {
+                Name = Path.GetFileNameWithoutExtension(dialog.FileName);
+            }
+        }
+    }
+
+    /// <summary>
+    /// 保存工具
+    /// </summary>
+    [RelayCommand]
+    private void Save()
+    {
+        try
+        {
+            if (string.IsNullOrWhiteSpace(Name))
+            {
+                _logService.Warning("工具名称不能为空");
+                return;
+            }
+
+            if (string.IsNullOrWhiteSpace(ExecutablePath))
+            {
+                _logService.Warning($"工具 \"{Name}\" 路径不能为空");
+                return;
+            }
+
+            // 编辑模式：更新已有工具
+            if (_editingTool != null)
+            {
+                _editingTool.Name = Name.Trim();
+                _editingTool.ExecutablePath = ExecutablePath.Trim();
+                _editingTool.Arguments = Arguments.Trim();
+                _editingTool.HotKey = HotKey.Trim();
+                _editingTool.CategoryId = SelectedCategory?.Id ?? string.Empty;
+                _editingTool.IsValid = IsExecutablePathValid(ExecutablePath.Trim());
+
+                _logService.Info($"已更新工具: {Name.Trim()}");
+            }
+            // 添加模式：创建新工具
+            else
+            {
+                var newTool = new ToolItem
+                {
+                    Name = Name.Trim(),
+                    ExecutablePath = ExecutablePath.Trim(),
+                    Arguments = Arguments.Trim(),
+                    HotKey = HotKey.Trim(),
+                    CategoryId = SelectedCategory?.Id ?? string.Empty,
+                    IsValid = IsExecutablePathValid(ExecutablePath.Trim())
+                };
+
+                _dataService.Config.Tools.Add(newTool);
+                _logService.Info($"已添加工具: {Name.Trim()}");
+            }
+
+            _dataService.Save();
+            Saved = true;
+            CloseAction?.Invoke(true);
+        }
+        catch (Exception ex)
+        {
+            _logService.Error($"保存工具失败: {ex.Message}");
+        }
+    }
+
+    /// <summary>
+    /// 取消编辑
+    /// </summary>
+    [RelayCommand]
+    private void Cancel()
+    {
+        CloseAction?.Invoke(false);
+    }
+
+    /// <summary>
+    /// 验证可执行路径是否有效
+    /// </summary>
+    private static bool IsExecutablePathValid(string path)
+    {
+        if (string.IsNullOrWhiteSpace(path))
+            return false;
+
+        // URL 格式（https://...）直接通过
+        if (Uri.TryCreate(path, UriKind.Absolute, out var uri) &&
+            (uri.Scheme == Uri.UriSchemeHttp || uri.Scheme == Uri.UriSchemeHttps))
+            return true;
+
+        // 纯文件名（无路径分隔符）可能位于系统 PATH 中
+        if (!path.Contains('\\') && !path.Contains('/'))
+            return true;
+
+        return File.Exists(path);
+    }
+}