improve:UI

Ink Canvas/Windows/DlassSettingsWindow.xaml

@@ -34,10 +34,12 @@
             CornerRadius="15"
             Margin="10"
             x:Name="MainBorder"
+            ClipToBounds="True"
             MouseLeftButtonDown="TitleBar_MouseLeftButtonDown">
         <Grid>
             <controls:WinUI3CloseButton x:Name="BtnClose" 
                                         HorizontalAlignment="Right" VerticalAlignment="Top" 
+                                        Width="46" Height="32"
                                         Margin="0,0,0,0" Cursor="Hand" Click="BtnClose_Click"
                                         Content="✕"/>
             
@@ -49,13 +51,13 @@
                 </Grid.RowDefinitions>
                 
                 <!-- 标题栏 --> 
-                <Grid Grid.Row="0" 
+                <Border Grid.Row="0" 
                         Height="50" 
                         Background="{StaticResource WindowBackground}" 
-                      x:Name="TitleBar" 
+                        CornerRadius="15,15,0,0"
-                      VerticalAlignment="Top" 
+                        Margin="0,0,46,0"
-                      MouseLeftButtonDown="TitleBar_MouseLeftButtonDown"
+                        MouseLeftButtonDown="TitleBar_MouseLeftButtonDown">
-                      Margin="0,0,46,0">
+                    <Grid x:Name="TitleBar" VerticalAlignment="Stretch">
                         <StackPanel Orientation="Horizontal" 
                                     HorizontalAlignment="Left" 
                                     VerticalAlignment="Center" 
@@ -77,11 +79,13 @@
                                        x:Name="TitleText"/>
                         </StackPanel>
                     </Grid>
+                </Border>
                 
                 <!-- 主内容区 -->
                 <Border Grid.Row="1" 
                         Background="{StaticResource WindowBackground}" 
-                        Padding="20,10,20,20">
+                        Padding="20,10,20,20"
+                        CornerRadius="0,0,15,15">
                     <ScrollViewer VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Disabled">
                         <ui:SimpleStackPanel Spacing="16">
                             <!-- 内容区域 -->