Fixes#24
When attaching fonts for ASS/SSA subtitles, the Attachment class was being
called with positional arguments instead of keyword arguments. This caused
the font Path object to be incorrectly interpreted, leading to an error:
"Invalid URL 'Arial (arial)': No scheme supplied."
Changed Attachment(font, name) to Attachment(path=font, name=name) to
explicitly pass arguments by keyword, ensuring proper parameter handling.
45902bba13