Remove Visible="false" from AdditionalFiles to fix Solution Explorer display

Co-authored-by: Soar360 <[email protected]>

Author: Copilot

LuYao.ResourcePacker.MSBuild/build/LuYao.ResourcePacker.MSBuild.targets

@@ -27,7 +27,7 @@
 
   <!-- Add resource files as AdditionalFiles for source generator -->
   <ItemGroup>
-    <AdditionalFiles Include="$(ResourcePackerDirectory)\**\*" Visible="false" />
+    <AdditionalFiles Include="$(ResourcePackerDirectory)\**\*" />
   </ItemGroup>
 
   <!-- Reference the source generator -->