Support PathLike image and package file inputs - #1123
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`pathlib.Path` (any `os.PathLike`) previously raised TypeError from `Image.from_file()` and was misrouted as a stream by the package reader's `_PhysPkgReader.factory()`. Path-like inputs are now normalized with `os.fspath()` at the boundaries, keeping the `str` fast-path and file-like behavior unchanged. Covered entry points: `Presentation()` open, `Presentation.save()` (package and part save), `Image.from_file()`, `shapes.add_picture()`, and picture-placeholder `insert_picture()`. Type hints along the forwarding chain are widened to `str | os.PathLike[str] | IO[bytes]`. Port of scanny#1123 by AlexanderWillner.
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Summary
os.PathLikeinputs inImage.from_file()os.PathLikeinputs inPart._blob_from_file()pathlib.Pathfile inputsWhy
python-pptxcurrently treats onlystrvalues as file paths in these helpers. Passingpathlib.Pathfalls through to the file-like branch and raises anAttributeErroron.seek/.readassumptions.Testing
PYTHONPATH=src python -m pytest tests/parts/test_image.py -qPYTHONPATH=src python -m pytest -o filterwarnings=ignore::pyparsing.warnings.PyparsingDeprecationWarning tests/opc/test_package.py tests/test_package.py -qslide.shapes.add_picture(Path(...), ...)with a JPEG fixture