chore: set initial version to 0.1.0-alpha in Directory.Build.props for project versioning

Author: Shewart

Directory.Build.props

@@ -18,6 +18,7 @@
 
   <!-- Package metadata (applies to any project with IsPackable=true) -->
   <PropertyGroup>
+    <Version>0.1.0-alpha</Version>
     <Authors>ShellUI</Authors>
     <Company>ShellUI</Company>
     <Copyright>Copyright © 2026 ShellUI</Copyright>