#4880 Ship Csla.Avalonia with the framework packages

[rockfordlhotka]

Relates to #4880.

#4887 added Csla.Xaml.Avalonia, but that project was only in its own solution. It wasn't in csla.build.sln, so Csla.Avalonia would not have been packed or published with 10.2.0-beta.1.

Framework packaging

• Adds Csla.Xaml.Avalonia to csla.build.sln under the UI folder. The release workflow packs this solution.
• Adds it to csla.test.sln as well, since CI only builds that solution.
• Aligns Csla.Xaml.Avalonia.csproj with the other packaged projects such as Csla.Wpf and Csla.Blazor:
  • It always references the Csla project. Release builds previously used the Csla 10.0.0 NuGet package, a setup copied from MAUI, which is released separately. The package would have depended on Csla 10.0.0 instead of the matching version.
  • Adds SignAssembly, BaseOutputPath, Product and Description.
  • Removes nullable settings that Directory.Build.props already provides, and switches to 2-space indentation.

Avalonia sample

The sample referenced Source/Csla.Xaml.Avalonia directly. That pulled framework projects into its build and failed with CS7027, because the signing key path depends on the solution directory. It now matches WpfExample:

• Adds Directory.Packages.props for central package management, with CslaVersion and AvaloniaVersion properties.
• The app and test projects reference the Csla.Avalonia package instead of the source project.
• CslaVersion is set to 10.2.0-beta.1, so the sample won't restore from nuget.org until that beta is published. Until then, point CslaVersion at a locally packed build.
• Updates the README to describe the package setup.

Verification

• dotnet pack Source/csla.build.sln -c Release -p:PublicRelease=true produces Csla.Avalonia.10.2.0-beta.1.nupkg:
  • Its metadata matches Csla.Wpf: license, icon, readme, repository commit, tags, and XML docs and pdb in lib.
  • It depends on Csla 10.2.0-beta.1 and Avalonia 12.1.1.
  • Csla.Xaml.dll is strong-named with the same key as Csla.Wpf (PublicKeyToken=93be5fdc093e4c30).
• A pack without -o writes Csla.Avalonia to bin/packages along with the other packages.
• dotnet build Source/csla.test.sln builds with 0 errors.
• Against the locally packed beta packages, using an isolated NuGet cache, the sample restores Csla and Csla.Avalonia as packages, builds, and passes its headless test (1/1).

Not changed

Csla.Analyzers packs to Bin/Release instead of bin/packages, because it doesn't import Directory.Package.props. That behavior predates this PR. The analyzers ship inside the Csla package, and moving this one would publish a standalone package at the next release.

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https://claude.ai/code/session_01NW2FoBK5ogTPJam3vmMmyZ