Summary

• accept os.PathLike inputs in Image.from_file()
• accept os.PathLike inputs in Part._blob_from_file()
• add regression coverage for pathlib.Path file inputs

Why

python-pptx currently treats only str values as file paths in these helpers. Passing pathlib.Path falls through to the file-like branch and raises an AttributeError on .seek/.read assumptions.

Testing

• PYTHONPATH=src python -m pytest tests/parts/test_image.py -q
• PYTHONPATH=src python -m pytest -o filterwarnings=ignore::pyparsing.warnings.PyparsingDeprecationWarning tests/opc/test_package.py tests/test_package.py -q
• smoke-tested slide.shapes.add_picture(Path(...), ...) with a JPEG fixture