feat: add page_no to TableCell

[ryyhan]

Description

Resolves #410.

Adds page_no attribute to the TableCell class to support cross-page table data as requested. This allows upstream parsers to store page location information for individual cells in multi-page tables.

Changes

• Modified TableCell in docling_core/types/doc/document.py to include optional page_no.
• Updated regression test gold file test/data/docling_document/unit/TableItem.yaml.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• New and existing unit tests pass locally with my changes

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Related Documentation

Checked 6 published document(s) in 1 knowledge base(s). No updates required.

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[ceberam]

@ryyhan Thanks for this PR. I think it makes sense to keep track of the page number (when available) in table cells.
Could you please check that the PR passes the code and style checks?
Simply run uv run pre-commit run --all-files. You may also want to install pre-commit locally with uv run pre-commit install to set up the git hook scripts.

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✅ All modified and coverable lines are covered by tests.

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[ceberam]

LGTM

[ryyhan]

LGTM

Thank you for the review and approval, @ceberam! I'm glad the changes look good.

[ryyhan]

@dolfim-ibm / @PeterStaar-IBM could you also please take a look when you have a moment? We need a second approval for the test updates to merge this.

[PeterStaar-IBM]

@ryyhan I am not sure about this, it looks like a patch instead of a proper solution