[A831ARD0]

Summary

A batch of small, independent correctness fixes found while reviewing src/__init__.py, src/utils.py, src/_apply_pages.py, and the table-extraction module. Each item below is a separate, self-contained fix; happy to split into individual PRs if preferred.

• Archive.add(): a missing comma in an assert turned the error message into part of the boolean expression, silently disabling the empty-name check for binary content (Archive().add(b"...", path="") no longer raised).
• Annot.file_info: UnboundLocalError when a malformed/crafted attachment's /FS dict has neither /UF nor /F.
• Page.set_language(): passed the bound method pdfpage.obj instead of calling it (pdfpage.obj()), breaking every call that actually sets a language.
• Widget.on_state(): TypeError when button_states() leaves an entry as None.
• Pixmap.tobytes(): missing f-string prefix meant the "cannot have alpha" error literally printed '{output}' instead of the format name.
• JM_matrix_from_py(): copy-paste bug returning mupdf.FzRect() instead of mupdf.FzMatrix() on the float-conversion failure path (latent — every other sibling converter returns its own correct type).
• utils.get_text(): a bare assert option in formats ran before the following if, making the documented "misspelled option falls back to 'text'" behavior unreachable (and behavior differed under -O).
• utils.get_label_pno(): raised IndexError instead of returning "" (as documented) when no label rule applies to the given page number.
• utils.get_sorted_text(): ZeroDivisionError for a zero-width glyph bbox.
• _apply_pages.py (method='fork'): workers received plain list indices (range(len(pages))) instead of the actual page numbers, so apply_pages(path, fn, pages=[3, 7, 9], method='fork') silently processed pages 0, 1, 2 instead — results were silently attributed to the wrong pages. Fixed by passing (index, page_number) pairs through the queue.
• table.chars_in_rect(): compared a top-down rect (from page.get_drawings()) against c["y0"]/c["y1"], which are in PDF-native (bottom-up) space, instead of the top-down c["top"]/c["bottom"]. This made box-drawn table borders (filled/connected rectangles instead of ruling lines) fail to register as table candidates.

Testing

I don't have a build of the compiled _fitz/mupdf C extension available, so I could not run the full test suite. Each fix was verified by:

• Reading the surrounding code and confirming the defect against the function's own documented contract or a directly comparable sibling function.
• python3 -m py_compile on every modified file to confirm no syntax errors were introduced.

Given that, please review carefully and let me know if you'd like any of these split out, reverted, or backed by a regression test before merging.

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[A831ARD0]

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[julian-smith-artifex-com]

Thanks for submitting this PR, looks like some good fixes in the areas i know about. I've enabled the pre-push tests.

You should be able to build/test fairly easily if you run pip in a python venv - all required packages etc will be installed automatically.

[julian-smith-artifex-com]

Could you rebase on top of latest branch main? Then we'll be able to run the PR test_quick. Thanks.

[julian-smith-artifex-com]

Many thanks for this PR, it all looks good, and i'm going to merge it now.