Phase 3 缺陷修复 + 分类管理功能 + ComboBox 主题适配

缺陷修复: 日志自动滚动、StaticResource 顺序修复、ContextMenu PlacementTarget 绑定、PATH 命令支持、异常全量捕获、RefreshData 状态保留、全局崩溃日志

分类管理: 添加/编辑/删除分类，删除时工具移入全部，CategoryEditViewModel/Window

UI 修复: ComboBox 自定义模板，暗色模式弹出层/下拉项主题配色，文本绑定修复

PersonalToolBox/ViewModels/CategoryEditViewModel.cs

@@ -0,0 +1,80 @@
+using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
+using PersonalToolBox.Models;
+using PersonalToolBox.Services;
+
+namespace PersonalToolBox.ViewModels;
+
+/// <summary>
+/// 分类编辑窗口 ViewModel，管理添加/编辑分类的交互逻辑
+/// </summary>
+public partial class CategoryEditViewModel : ObservableObject
+{
+    private readonly IDataService _dataService;
+    private readonly ILogService _logService;
+    private readonly Category? _editingCategory;
+
+    [ObservableProperty]
+    private string _windowTitle = "添加分类";
+
+    [ObservableProperty]
+    private string _name = string.Empty;
+
+    public Action<bool?>? CloseAction { get; set; }
+    public bool Saved { get; private set; }
+
+    public CategoryEditViewModel(IDataService dataService, ILogService logService, Category? categoryToEdit = null)
+    {
+        _dataService = dataService;
+        _logService = logService;
+        _editingCategory = categoryToEdit;
+
+        if (categoryToEdit != null)
+        {
+            WindowTitle = "编辑分类";
+            Name = categoryToEdit.Name;
+        }
+    }
+
+    [RelayCommand]
+    private void Save()
+    {
+        try
+        {
+            if (string.IsNullOrWhiteSpace(Name))
+            {
+                _logService.Warning("分类名称不能为空");
+                return;
+            }
+
+            if (_editingCategory != null)
+            {
+                _editingCategory.Name = Name.Trim();
+                _logService.Info($"已更新分类: {Name.Trim()}");
+            }
+            else
+            {
+                _dataService.Config.Categories.Add(new Category
+                {
+                    Id = Guid.NewGuid().ToString(),
+                    Name = Name.Trim()
+                });
+                _logService.Info($"已添加分类: {Name.Trim()}");
+            }
+
+            _dataService.Save();
+            Saved = true;
+            CloseAction?.Invoke(true);
+        }
+        catch (Exception ex)
+        {
+            _logService.Error($"保存分类失败: {ex.Message}");
+        }
+    }
+
+    [RelayCommand]
+    private void Cancel()
+    {
+        CloseAction?.Invoke(false);
+    }
+}