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.Tests/ViewModels/ToolEditViewModelTests.cs

@@ -0,0 +1,151 @@
+using Moq;
+using PersonalToolBox.Models;
+using PersonalToolBox.Services;
+using PersonalToolBox.ViewModels;
+
+namespace PersonalToolBox.Tests.ViewModels;
+
+public class ToolEditViewModelTests
+{
+    private readonly Mock<IDataService> _dataServiceMock = new();
+    private readonly Mock<ILogService> _logServiceMock = new();
+    private readonly AppConfig _config;
+
+    public ToolEditViewModelTests()
+    {
+        _config = new AppConfig
+        {
+            Categories =
+            [
+                new() { Id = "1", Name = "开发工具" }
+            ]
+        };
+        _dataServiceMock.Setup(d => d.Config).Returns(_config);
+    }
+
+    [Fact]
+    public void Constructor_AddMode_SetsTitle()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object);
+
+        Assert.Equal("添加工具", vm.WindowTitle);
+        Assert.Empty(vm.Name);
+        Assert.Empty(vm.ExecutablePath);
+    }
+
+    [Fact]
+    public void Constructor_EditMode_SetsTitleAndFields()
+    {
+        var tool = new ToolItem
+        {
+            Name = "MyTool",
+            ExecutablePath = @"C:\test.exe",
+            Arguments = "/arg",
+            HotKey = "Ctrl+T",
+            CategoryId = "1"
+        };
+
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object, tool);
+
+        Assert.Equal("编辑工具", vm.WindowTitle);
+        Assert.Equal("MyTool", vm.Name);
+        Assert.Equal(@"C:\test.exe", vm.ExecutablePath);
+        Assert.Equal("/arg", vm.Arguments);
+        Assert.Equal("Ctrl+T", vm.HotKey);
+    }
+
+    [Fact]
+    public void Save_EmptyName_LogsWarning()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object)
+        {
+            ExecutablePath = @"C:\test.exe"
+        };
+
+        vm.SaveCommand.Execute(null);
+
+        _logServiceMock.Verify(x => x.Warning(It.Is<string>(s => s.Contains("名称不能为空"))), Times.Once);
+    }
+
+    [Fact]
+    public void Save_EmptyPath_LogsWarning()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object)
+        {
+            Name = "Test"
+        };
+
+        vm.SaveCommand.Execute(null);
+
+        _logServiceMock.Verify(x => x.Warning(It.Is<string>(s => s.Contains("路径不能为空"))), Times.Once);
+    }
+
+    [Fact]
+    public void Save_AddMode_AddsToolAndCloses()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object)
+        {
+            Name = "NewTool",
+            ExecutablePath = @"C:\test.exe"
+        };
+        bool? closeResult = null;
+        vm.CloseAction = (r) => closeResult = r;
+
+        vm.SaveCommand.Execute(null);
+
+        Assert.True(vm.Saved);
+        Assert.True(closeResult);
+        Assert.Single(_config.Tools);
+        Assert.Equal("NewTool", _config.Tools[0].Name);
+        _dataServiceMock.Verify(x => x.Save(), Times.Once);
+    }
+
+    [Fact]
+    public void Save_EditMode_UpdatesToolAndCloses()
+    {
+        var tool = new ToolItem
+        {
+            Name = "OldName",
+            ExecutablePath = @"C:\old.exe"
+        };
+
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object, tool)
+        {
+            Name = "NewName",
+            ExecutablePath = @"C:\new.exe"
+        };
+        bool? closeResult = null;
+        vm.CloseAction = (r) => closeResult = r;
+
+        vm.SaveCommand.Execute(null);
+
+        Assert.True(vm.Saved);
+        Assert.True(closeResult);
+        Assert.Equal("NewName", tool.Name);
+        Assert.Equal(@"C:\new.exe", tool.ExecutablePath);
+        _dataServiceMock.Verify(x => x.Save(), Times.Once);
+    }
+
+    [Fact]
+    public void Cancel_ClosesWithoutSaving()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object);
+        bool? closeResult = null;
+        vm.CloseAction = (r) => closeResult = r;
+
+        vm.CancelCommand.Execute(null);
+
+        Assert.False(vm.Saved);
+        Assert.False(closeResult);
+        _dataServiceMock.Verify(x => x.Save(), Times.Never);
+    }
+
+    [Fact]
+    public void Constructor_LoadsCategories()
+    {
+        var vm = new ToolEditViewModel(_dataServiceMock.Object, _logServiceMock.Object);
+
+        Assert.Single(vm.Categories);
+        Assert.Equal("开发工具", vm.Categories[0].Name);
+    }
+}