Fix MacCatalyst GUI CI build by correcting target-specific publish/workload handling

[Copilot]

The build-gui (maccatalyst-x64, macos-latest, net10.0-maccatalyst, gui-osx-x64) job was failing due to MacCatalyst-specific build configuration mismatch in CI. This updates the GUI build path so MacCatalyst runs with the correct target/runtime assumptions.

• Root-cause alignment in GUI CI build

  • Adjusted the GUI build configuration/workflow for the MacCatalyst matrix entry to use the correct target-specific settings.
  • Removed the mismatch that caused the MacCatalyst leg to fail while other GUI legs remained valid.

• MacCatalyst-specific configuration cleanup

  • Tightened target-conditional handling so platform-specific options are only applied where valid.
  • Kept the change scoped to the failing build path to avoid cross-platform regressions.

# representative pattern applied in CI/build config
- name: Build GUI
  run: dotnet publish src/AtsScanner.Gui \
    -f net10.0-maccatalyst \
    -r maccatalyst-x64 \
    -c Release

[Copilot]

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