Fix compression settings in project file

- Only enable compression for self-contained single-file builds
- Framework-dependent builds cannot use compression
- Fixes NETSDK1176 error in GitHub Actions

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: jaredthirsk

src/wpf/MetricClock.csproj

@@ -24,6 +24,10 @@
   <!-- Single-file publishing configuration -->
   <PropertyGroup Condition="'$(PublishSingleFile)' == 'true'">
     <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+  </PropertyGroup>
+  
+  <!-- Compression only for self-contained single-file builds -->
+  <PropertyGroup Condition="'$(PublishSingleFile)' == 'true' AND '$(SelfContained)' == 'true'">
     <EnableCompressionInSingleFile>true</EnableCompressionInSingleFile>
   </PropertyGroup>