Fix pipe characters in HTML table cells

[Aakash Neupane (akkinyu2002)]

Summary

• escape literal pipe characters in HTML table cell content
• preserve table separators and colspan handling through markdownify
• add regression coverage for issue HTML/DOCX: pipe characters in table cells break Markdown tables #2438

Validation

• python -m pytest packages/markitdown/tests/test_html_converter.py -q (12 passed)
• python -m pytest packages/markitdown/tests -q (641 passed, 6 unrelated environment/platform or external-fixture failures)

Fixes #2438

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[Copilot]

🟡 Changes recommended

Literal backslash runs before pipes can still leave Markdown table delimiters unescaped.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Fixes literal pipe handling in HTML table cells to preserve Markdown table structure.

Changes:

• Escapes pipes in HTML table cells.
• Adds regression coverage.

File summaries

File	Summary
packages/markitdown/tests/test_html_converter.py	Adds regression tests for pipes in HTML tables.
packages/markitdown/src/markitdown/converters/_markdownify.py	Implements table-cell pipe escaping.

Review details

• Files reviewed: 2/2 changed files
• Comments generated: 1
• Review effort level: Lite

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