工具路径为exe时默认显示exe自身图标

ToolItem新增IsExePath计算属性，ExePathToIconConverter通过Icon.ExtractAssociatedIcon提取exe图标并缓存，卡片模板图标区改为三层优先级：FontAwesome > exe图标 > 首字母

PersonalToolBox/Views/MainWindow.xaml

@@ -17,6 +17,7 @@
         <local:BoolToOpacityConverter x:Key="BoolToOpacityConverter"/>
         <local:FirstCharConverter x:Key="FirstCharConverter"/>
         <local:StringToIconCharConverter x:Key="StringToIconCharConverter"/>
+        <local:ExePathToIconConverter x:Key="ExePathToIconConverter"/>
 
         <!-- 工具卡片模板 -->
         <DataTemplate x:Key="ToolCardTemplate" DataType="{x:Type models:ToolItem}">
@@ -93,7 +94,26 @@
                                 </Style>
                             </fa:IconBlock.Style>
                         </fa:IconBlock>
-                        <!-- 首字母回退（IconCode 为空时显示） -->
+                        <!-- exe 图标回退（IconCode为空且为exe时显示） -->
+                        <Image Source="{Binding ExecutablePath, Converter={StaticResource ExePathToIconConverter}}"
+                               Width="28" Height="28"
+                               HorizontalAlignment="Center">
+                            <Image.Style>
+                                <Style TargetType="Image">
+                                    <Setter Property="Visibility" Value="Collapsed"/>
+                                    <Style.Triggers>
+                                        <MultiDataTrigger>
+                                            <MultiDataTrigger.Conditions>
+                                                <Condition Binding="{Binding IconCode}" Value=""/>
+                                                <Condition Binding="{Binding IsExePath}" Value="True"/>
+                                            </MultiDataTrigger.Conditions>
+                                            <Setter Property="Visibility" Value="Visible"/>
+                                        </MultiDataTrigger>
+                                    </Style.Triggers>
+                                </Style>
+                            </Image.Style>
+                        </Image>
+                        <!-- 首字母回退（IconCode为空且非exe时显示） -->
                         <TextBlock FontSize="28"
                                    Foreground="{DynamicResource Theme.Accent}"
                                    HorizontalAlignment="Center">
@@ -102,9 +122,13 @@
                                     <Setter Property="Visibility" Value="Collapsed"/>
                                     <Setter Property="Text" Value="{Binding Name, Converter={StaticResource FirstCharConverter}}"/>
                                     <Style.Triggers>
-                                        <DataTrigger Binding="{Binding IconCode}" Value="">
+                                        <MultiDataTrigger>
+                                            <MultiDataTrigger.Conditions>
+                                                <Condition Binding="{Binding IconCode}" Value=""/>
+                                                <Condition Binding="{Binding IsExePath}" Value="False"/>
+                                            </MultiDataTrigger.Conditions>
                                             <Setter Property="Visibility" Value="Visible"/>
-                                        </DataTrigger>
+                                        </MultiDataTrigger>
                                     </Style.Triggers>
                                 </Style>
                             </TextBlock.Style>