Improve macOS CI packaging by trimming unnecessary files from the built .app and adjusting build options. Changes include:
- Enable cx_Freeze silent build and run Python with -OO for bdist_mac.
- Add zip_include_packages to ensure key packages are bundled inside zip distributions.
- Exclude additional stdlib modules (pydoc, doctest, email) to reduce size.
- New workflow step to locate the generated .app and remove screenshots, Qt translations, unused PySide6 plugins and other Qt artifacts (Qt6Web*, Qt6Pdf*), with safer path detection and logging.
- Remove noisy post-build directory listings and simplify DMG handling/log messages; make .app and .dmg discovery more robust.
These changes aim to produce smaller, cleaner artifacts and more reliable CI packaging for macOS builds.
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