fix(docx): keep the text of wrapped runs in plain table cells

[breken-ai]

A plain Word table cell loses any text held in an inline content control, a simple field, a smart tag or a tracked insertion.

_handle_tables takes a plain cell's text from python-docx's _Cell.text. That only joins the runs and hyperlinks that are direct children of each paragraph (CT_P.text reads w:r | w:hyperlink). Body paragraphs are read through _iter_paragraph_content, which already goes into w:sdt, w:fldSimple, w:smartTag, w:customXml and w:ins, so the same content survives in a paragraph but is dropped in a table.

This matters most for forms. Word forms are usually tables with the answers in content controls, and mail-merge output keeps its values in MERGEFIELD field results. A cell such as Name | <content control: Jane Doe> comes out as Name | with the answer gone:

label	cell content	main	this PR
Name	inline content control (w:sdt)	``	Jane Doe
Customer	MERGEFIELD result (w:fldSimple)	``	ACME Corp
City	smart tag	``	Paris
Amount	tracked insertion (w:ins)	``	1200

Change: a small _get_cell_text helper joins _get_paragraph_text for each cell paragraph with \n, which is the same joining _Cell.text uses. The cell code uses it both for the equation check and for the cell text. Rich cells and everything else are unchanged.

Tests: test_table_cell_keeps_text_of_wrapped_runs builds a table with one wrapper per row. It fails on main ('' != 'Jane Doe') and passes with the fix. tests/test_backend_msword*.py and tests/test_backend_legacy_msoffice.py pass (261 passed, 5 skipped) and no reference data changed. ruff check, ruff format --check and ty check are clean. ty reports the same diagnostics as on main.

I found and fixed this with help from an AI coding assistant, and I reviewed the change and the test results myself.

Checklist:

• Documentation has been updated, if necessary.
• Examples have been added, if necessary.
• Tests have been added, if necessary.

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[ceberam]

Thanks @breken-ai for describing the issue and posting this PR!
Before starting the review, could you please attach a sample .docx file (e.g. created with Word or LibreOffice) that shows the cases you described around forms? It would also help comparing the output from main and from your PR.