Phase 7: 自定义图标系统 + 组合嵌套 + 删除功能 + UI 优化

- 安装 FontAwesome.Sharp v6.6.0，新增 Helpers/IconProvider.cs（190+ 图标，11 分类）
- ToolEditWindow/GroupEditWindow: 添加图标选择 ComboBox，按分类分组，带图标预览
- MainWindow 卡片模板: 使用 fa:IconBlock 渲染图标，IconCode 为空时回退首字母
- 组合角标从 emoji 改为 FontAwesome Cubes 图标，放置于卡片右上角
- ComboBox 样式修复: TextBlock→ContentPresenter，支持 ItemTemplate+DisplayMemberPath
- ComboBox 滚轮修复: CanContentScroll=False 解决分组模式下滑轮跳组问题
- 编辑弹窗: 所有输入控件添加 VerticalContentAlignment=Center
- 组合可包含其他组合: GetAncestorIds 递归排除自身及祖先防止循环引用
- ProcessExecutionService: 支持嵌套组合递归执行，visited 集合防死循环
- MainWindow 右键菜单新增删除功能，工具和组合均支持
- 移除侧边栏顶部个人工具箱标题文字
- 更新测试: 适配组合嵌套逻辑，新增祖先排除测试 (83/83 通过)

PersonalToolBox/Views/ToolEditWindow.xaml

@@ -2,13 +2,14 @@
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:models="clr-namespace:PersonalToolBox.Models"
-        Title="{Binding WindowTitle}" Height="380" Width="480"
+        xmlns:fa="http://schemas.awesome.incremented/wpf/xaml/fontawesome.sharp"
+        Title="{Binding WindowTitle}" Height="480" Width="520"
         WindowStartupLocation="CenterOwner"
         ResizeMode="NoResize"
         Background="{DynamicResource Theme.Background}">
 
     <Window.Resources>
-        <!-- ComboBox 下拉项统一样式 -->
+        <!-- ComboBox 下拉项样式 -->
         <Style TargetType="ComboBoxItem">
             <Setter Property="Background" Value="{DynamicResource Theme.InputBackground}"/>
             <Setter Property="Foreground" Value="{DynamicResource Theme.Foreground}"/>
@@ -19,7 +20,7 @@
                         <Border x:Name="Border"
                                 Background="{TemplateBinding Background}"
                                 Padding="{TemplateBinding Padding}">
-                            <ContentPresenter/>
+                            <ContentPresenter VerticalAlignment="Center"/>
                         </Border>
                         <ControlTemplate.Triggers>
                             <Trigger Property="IsHighlighted" Value="True">
@@ -32,12 +33,13 @@
             </Setter>
         </Style>
 
-        <!-- ComboBox 整体样式（覆盖弹出层背景） -->
+        <!-- ComboBox 整体样式（兼容 DisplayMemberPath 和 ItemTemplate） -->
         <Style TargetType="ComboBox">
             <Setter Property="Background" Value="{DynamicResource Theme.InputBackground}"/>
             <Setter Property="Foreground" Value="{DynamicResource Theme.Foreground}"/>
             <Setter Property="BorderBrush" Value="{DynamicResource Theme.InputBorder}"/>
             <Setter Property="BorderThickness" Value="1"/>
+            <Setter Property="VerticalContentAlignment" Value="Center"/>
             <Setter Property="Template">
                 <Setter.Value>
                     <ControlTemplate TargetType="ComboBox">
@@ -46,9 +48,8 @@
                                           Background="{TemplateBinding Background}"
                                           BorderBrush="{TemplateBinding BorderBrush}"
                                           BorderThickness="{TemplateBinding BorderThickness}"
-                                          Foreground="{TemplateBinding Foreground}"
                                           IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
-                                          Padding="{TemplateBinding Padding}">
+                                          ClickMode="Press">
                                 <ToggleButton.Template>
                                     <ControlTemplate TargetType="ToggleButton">
                                         <Border Background="{TemplateBinding Background}"
@@ -56,11 +57,13 @@
                                                 BorderThickness="{TemplateBinding BorderThickness}"
                                                 Padding="{TemplateBinding Padding}">
                                             <Grid>
-                                                <TextBlock Text="{Binding Text, RelativeSource={RelativeSource AncestorType=ComboBox}}"
-                                                       Foreground="{TemplateBinding Foreground}"
-                                                       VerticalAlignment="Center"
-                                                       HorizontalAlignment="Left"
-                                                       Margin="6,0,0,0"/>
+                                                <ContentPresenter x:Name="ContentSite"
+                                                                  Content="{Binding SelectionBoxItem, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}"
+                                                                  ContentTemplate="{Binding SelectionBoxItemTemplate, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}"
+                                                                  ContentStringFormat="{Binding SelectionBoxItemStringFormat, RelativeSource={RelativeSource AncestorType={x:Type ComboBox}}}"
+                                                                  VerticalAlignment="Center"
+                                                                  HorizontalAlignment="Left"
+                                                                  Margin="6,0,0,0"/>
                                                 <Path x:Name="Arrow" Data="M0,0 L4,4 8,0" Stroke="{TemplateBinding Foreground}"
                                                       StrokeThickness="1.5" HorizontalAlignment="Right" Width="8"
                                                       VerticalAlignment="Center" Margin="0,0,6,0"/>
@@ -81,7 +84,7 @@
                                             BorderBrush="{DynamicResource Theme.InputBorder}"
                                             BorderThickness="1"
                                             SnapsToDevicePixels="True">
-                                        <ScrollViewer>
+                                        <ScrollViewer CanContentScroll="False">
                                             <ItemsPresenter/>
                                         </ScrollViewer>
                                     </Border>
@@ -102,6 +105,7 @@
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="Auto"/>
+            <RowDefinition Height="Auto"/>
             <RowDefinition Height="*"/>
             <RowDefinition Height="Auto"/>
         </Grid.RowDefinitions>
@@ -113,26 +117,67 @@
 
         <!-- 工具名称 -->
         <TextBlock Grid.Row="0" Grid.Column="0"
-                   Text="名称:" Foreground="{DynamicResource Theme.Foreground}"
+                   Text="名称:"
+                   Foreground="{DynamicResource Theme.Foreground}"
                    VerticalAlignment="Center" Margin="0,0,0,12"/>
         <TextBox Grid.Row="0" Grid.Column="1" Grid.ColumnSpan="2"
                  Text="{Binding Name, UpdateSourceTrigger=PropertyChanged}"
                  Background="{DynamicResource Theme.InputBackground}"
                  Foreground="{DynamicResource Theme.Foreground}"
                  BorderBrush="{DynamicResource Theme.InputBorder}"
+                 VerticalContentAlignment="Center"
                  Height="30" Margin="0,0,0,12" Padding="6,0"/>
 
-        <!-- 工具路径 -->
+        <!-- 工具图标 -->
         <TextBlock Grid.Row="1" Grid.Column="0"
-                   Text="路径:" Foreground="{DynamicResource Theme.Foreground}"
+                   Text="图标:"
+                   Foreground="{DynamicResource Theme.Foreground}"
                    VerticalAlignment="Center" Margin="0,0,0,12"/>
-        <TextBox Grid.Row="1" Grid.Column="1"
+        <ComboBox Grid.Row="1" Grid.Column="1" Grid.ColumnSpan="2"
+                  ItemsSource="{Binding AvailableIconsView}"
+                  SelectedItem="{Binding SelectedIcon}"
+                  Height="30" Margin="0,0,0,12" Padding="4,0">
+            <ComboBox.GroupStyle>
+                <GroupStyle>
+                    <GroupStyle.HeaderTemplate>
+                        <DataTemplate>
+                            <TextBlock Text="{Binding Name}"
+                                       FontWeight="SemiBold"
+                                       Foreground="{DynamicResource Theme.Accent}"
+                                       FontSize="11"
+                                       Margin="10,6,0,2"/>
+                        </DataTemplate>
+                    </GroupStyle.HeaderTemplate>
+                </GroupStyle>
+            </ComboBox.GroupStyle>
+            <ComboBox.ItemTemplate>
+                <DataTemplate>
+                    <StackPanel Orientation="Horizontal">
+                        <fa:IconBlock Icon="{Binding Icon}"
+                                      FontSize="16" Width="28"
+                                      Foreground="{DynamicResource Theme.Accent}"
+                                      VerticalAlignment="Center"/>
+                        <TextBlock Text="{Binding Name}"
+                                   Foreground="{DynamicResource Theme.Foreground}"
+                                   VerticalAlignment="Center" Margin="8,0,0,0"/>
+                    </StackPanel>
+                </DataTemplate>
+            </ComboBox.ItemTemplate>
+        </ComboBox>
+
+        <!-- 工具路径 -->
+        <TextBlock Grid.Row="2" Grid.Column="0"
+                   Text="路径:"
+                   Foreground="{DynamicResource Theme.Foreground}"
+                   VerticalAlignment="Center" Margin="0,0,0,12"/>
+        <TextBox Grid.Row="2" Grid.Column="1"
                  Text="{Binding ExecutablePath, UpdateSourceTrigger=PropertyChanged}"
                  Background="{DynamicResource Theme.InputBackground}"
                  Foreground="{DynamicResource Theme.Foreground}"
                  BorderBrush="{DynamicResource Theme.InputBorder}"
+                 VerticalContentAlignment="Center"
                  Height="30" Margin="0,0,0,12" Padding="6,0"/>
-        <Button Grid.Row="1" Grid.Column="2"
+        <Button Grid.Row="2" Grid.Column="2"
                 Content="..."
                 Command="{Binding BrowseFileCommand}"
                 Background="{DynamicResource Theme.ButtonBackground}"
@@ -142,50 +187,55 @@
                 FontWeight="Bold" Cursor="Hand"/>
 
         <!-- 运行参数 -->
-        <TextBlock Grid.Row="2" Grid.Column="0"
-                   Text="参数:" Foreground="{DynamicResource Theme.Foreground}"
+        <TextBlock Grid.Row="3" Grid.Column="0"
+                   Text="参数:"
+                   Foreground="{DynamicResource Theme.Foreground}"
                    VerticalAlignment="Center" Margin="0,0,0,12"/>
-        <TextBox Grid.Row="2" Grid.Column="1" Grid.ColumnSpan="2"
+        <TextBox Grid.Row="3" Grid.Column="1" Grid.ColumnSpan="2"
                  Text="{Binding Arguments, UpdateSourceTrigger=PropertyChanged}"
                  Background="{DynamicResource Theme.InputBackground}"
                  Foreground="{DynamicResource Theme.Foreground}"
                  BorderBrush="{DynamicResource Theme.InputBorder}"
+                 VerticalContentAlignment="Center"
                  Height="30" Margin="0,0,0,12" Padding="6,0"/>
 
         <!-- 所属分类 -->
-        <TextBlock Grid.Row="3" Grid.Column="0"
-                   Text="分类:" Foreground="{DynamicResource Theme.Foreground}"
+        <TextBlock Grid.Row="4" Grid.Column="0"
+                   Text="分类:"
+                   Foreground="{DynamicResource Theme.Foreground}"
                    VerticalAlignment="Center" Margin="0,0,0,12"/>
-        <ComboBox Grid.Row="3" Grid.Column="1" Grid.ColumnSpan="2"
-                  ItemsSource="{Binding Categories}"
-                  SelectedItem="{Binding SelectedCategory}"
-                  DisplayMemberPath="Name"
-                  Height="30" Margin="0,0,0,12" Padding="4,0"/>
+        <ComboBox Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2"
+                   ItemsSource="{Binding Categories}"
+                   SelectedItem="{Binding SelectedCategory}"
+                   DisplayMemberPath="Name"
+                   Height="30" Margin="0,0,0,12" Padding="4,0"/>
 
         <!-- 全局快捷键 -->
-        <TextBlock Grid.Row="4" Grid.Column="0"
-                   Text="快捷键:" Foreground="{DynamicResource Theme.Foreground}"
+        <TextBlock Grid.Row="5" Grid.Column="0"
+                   Text="快捷键:"
+                   Foreground="{DynamicResource Theme.Foreground}"
                    VerticalAlignment="Center" Margin="0,0,0,12"/>
-        <TextBox Grid.Row="4" Grid.Column="1" Grid.ColumnSpan="2"
+        <TextBox Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2"
                  Text="{Binding HotKey, UpdateSourceTrigger=PropertyChanged}"
                  Background="{DynamicResource Theme.InputBackground}"
                  Foreground="{DynamicResource Theme.Foreground}"
                  BorderBrush="{DynamicResource Theme.InputBorder}"
+                 VerticalContentAlignment="Center"
                  Height="30" Margin="0,0,0,12" Padding="6,0"/>
 
         <!-- 提示文字 -->
-        <TextBlock Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2"
+        <TextBlock Grid.Row="6" Grid.Column="1" Grid.ColumnSpan="2"
                    Text="快捷键格式示例: Ctrl+Alt+T"
                    Foreground="{DynamicResource Theme.TextSecondary}"
                    FontSize="11" Margin="0,0,0,16"/>
 
         <!-- 分隔线 -->
-        <Border Grid.Row="6" Grid.ColumnSpan="3"
+        <Border Grid.Row="7" Grid.ColumnSpan="3"
                 BorderBrush="{DynamicResource Theme.CardBorder}"
                 BorderThickness="0,1,0,0" Margin="0,0,0,14"/>
 
         <!-- 按钮 -->
-        <StackPanel Grid.Row="7" Grid.Column="1" Grid.ColumnSpan="2"
+        <StackPanel Grid.Row="8" Grid.Column="1" Grid.ColumnSpan="2"
                     Orientation="Horizontal" HorizontalAlignment="Right">
             <Button Content="保存"
                     Command="{Binding SaveCommand}"