[MohammadHijjawi97]

Description

doc2md_convert fails on any .pptx that contains a table with text:

RuntimeError: Failed to convert deck.pptx: 'Font' object has no attribute 'strike'

The table-cell code in paddleocr/_doc2md/converters/pptx.py reads run.font.strike, but python-pptx's Font has no strikethrough property (python-pptx 1.0.2 exposes only bold, color, fill, italic, language_id, name, size and underline).

The helper meant for this, _pptx_run_strike(), had a second bug: it looked up a namespace-qualified strike attribute, but DrawingML writes strike unqualified on <a:rPr> (the same as baseline, which _pptx_run_script() already reads correctly). So strikethrough in text boxes was never rendered either.

Changes:

• _pptx_run_strike() reads the unqualified strike attribute (sngStrike / dblStrike).
• Table cells use _pptx_run_strike() instead of run.font.strike.
• New tests/doc2md/test_pptx_converter.py builds small decks with python-pptx in tmp_path and checks a table (with a struck cell) and a text box with struck and plain runs.

Repro (deck: one 2x2 table, one text box with a struck run):

Before:

RuntimeError Failed to convert t.pptx: 'Font' object has no attribute 'strike'

After:

<table>
<tr>
<th>Name</th>
<th>Value</th>
</tr>
<tr>
<td>a</td>
<td><del>1</del></td>
</tr>
</table>

- ~~old price~~

Testing

• pytest tests/doc2md tests/utils: 4 passed. Both new tests fail without the fix.
• black 24.10.0 and flake8 7.1.1 (the pre-commit pins) are clean on the changed files.

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