Fix recent project version picker

[marko1olo]

Summary

• pass the selected compatible Stride version into the recent-project OpenWithCommand
• add a XAML regression test so the version-picker button keeps its command parameter

Why

The recent-project menu renders entries such as Open with {version}, but the button did not pass the clicked version to RecentProjectViewModel.OpenWithCommand. The command therefore received null and fell back to the project's recorded version instead of the selected menu item.

Part of #2744.

Tests

• C:\hades\.dotnet-10.0.300\dotnet.exe test sources\launcher\Stride.Launcher.Tests\Stride.Launcher.Tests.csproj -v minimal
• C:\hades\.dotnet-10.0.300\dotnet.exe format sources\launcher\Stride.Launcher.Tests\Stride.Launcher.Tests.csproj whitespace --verify-no-changes --no-restore --include sources\launcher\Stride.Launcher.Tests\MainViewXamlTests.cs -v minimal
• git -c core.whitespace=blank-at-eol,blank-at-eof,space-before-tab,cr-at-eol diff --check

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