- Pin SkiaSharp back to 3.119.4 in LibationUiBase to match Avalonia.Skia's
expected native Skia milestone and restore the sk_fontmgr_ref_default export.
- Wrap BuildAvaloniaApp()?.SetupWithoutStarting() in Program.cs in try/catch to
prevent InvalidOperationException ('Setup was already called on one of
AppBuilder instances') when startup faults inside AppBuilder.Setup().
- Add TryShowFallbackAlert in Program.cs to output to stderr and trigger a
native OS dialog (osascript display alert on macOS, MessageBoxW on Windows)
when Avalonia cannot initialize its UI subsystem.