fix: 格式化碰撞报告窗口中检测间隙的显示

问题：检测间隙显示为0.05001768，精度过高不便阅读
解决：在XAML绑定中添加StringFormat={}{0:F2}格式化为两位小数
效果：现在显示为0.05，清晰易读

修改文件：
- CollisionReportDialog.xaml: 为DetectionGap绑定添加格式化

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Co-Authored-By: Claude <noreply@anthropic.com>

src/UI/WPF/Views/CollisionReportDialog.xaml

@@ -264,7 +264,7 @@ NavisworksTransport 碰撞检测报告对话框 - 采用与主界面一致的Nav
                                         <RowDefinition Height="Auto"/>
                                     </Grid.RowDefinitions>
                                     <TextBlock Grid.Row="0" Text="检测间隙(米)" Style="{StaticResource StatisticLabelStyle}"/>
-                                    <TextBlock Grid.Row="1" Text="{Binding DetectionGap}" Style="{StaticResource StatisticValueStyle}"/>
+                                    <TextBlock Grid.Row="1" Text="{Binding DetectionGap, StringFormat={}{0:F2}}" Style="{StaticResource StatisticValueStyle}"/>
                                 </Grid>
                             </Border>
                         </UniformGrid>