优化直方图区域布局。

XP.Hardware.Detector/Views/DetectorConfigView.xaml

@@ -12,7 +12,7 @@
              prism:ViewModelLocator.AutoWireViewModel="True"
              Background="White">
 
-    <Grid Margin="15">
+    <Grid Margin="15 15 15 5">
         <Grid.RowDefinitions>
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="10"/>
@@ -23,8 +23,8 @@
             <RowDefinition Height="Auto"/>
             <RowDefinition Height="10"/>
             <RowDefinition Height="Auto"/>
-            <RowDefinition Height="10"/>
-            <RowDefinition Height="150"/>
+            <RowDefinition Height="8"/>
+            <RowDefinition Height="*"/>
         </Grid.RowDefinitions>
 
         <!-- 第1行：灵敏度 + 帧率 | Row 1: Sensitivity (PGA) + Frame rate -->
@@ -140,11 +140,12 @@
             </telerik:RadButton>
         </Grid>
 
-        <!-- 第6行：图像灰度直方图 | Row 6: Image grayscale histogram -->
+        <!-- 第6行：图像灰度直方图（填充剩余空间）| Row 6: Image grayscale histogram (fill remaining space) -->
         <hist:ImageHistogramControl x:Name="HistogramControl"
                                      Grid.Row="10"
                                      MaxFrameRate="10"
                                      IsLogarithmic="False"
-                                     HorizontalAlignment="Stretch"/>
+                                     HorizontalAlignment="Stretch"
+                                     VerticalAlignment="Stretch"/>
     </Grid>
 </UserControl>