style(MainWindow.xaml): 调整 StackPanel 的 Margin 值以优化布局

ci(build.yml): 修改版本号生成规则，添加 alpha 前缀

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
           $version = "$version-pr${{ github.event.number }}"
         } else {
           $shortSha = $env:GITHUB_SHA.Substring(0, 7)
-          $version = "$version-$shortSha"
+          $version = "$version-alpha$shortSha"
         }
         echo "version=$version" >> $env:GITHUB_OUTPUT
         echo "Version: $version"

MainWindow.xaml

@@ -9,7 +9,7 @@
         KeyDown="Window_KeyDown">
     
     <Grid>
-        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,0,0,100">
+        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,0,0,-200">
             <!-- 状态显示 -->
             <TextBlock x:Name="StatusText" 
                        Text="正在初始化..."