chore: read $app_name from CFBundleDisplayName as a fallback if CFBundleName isn't available

[marandaneto]

💡 Motivation and Context

Closes #92

💚 How did you test it?

both are always xctest because it comes from the test runner, test already exists.

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.