fix(preset-gfm): incorrect table parsing when pasting from Google Docs

[Saul-Mirone]

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Summary

Fixes #2259

Google Docs tables only use <td>, never <th>. When pasting such a table, ProseMirror's schema (content: 'table_header_row table_row+') auto-inserts an empty table_header_row, and the paste rule fills it with empty <br> cells — producing N+1 rows instead of N.

The fix promotes the first data row to become the header row (converting table_cell → table_header) when there are 2+ data rows. For single-row tables, the existing fallback (empty header cells) is kept to satisfy the table_row+ constraint.

Also switched from flat slice.content.forEach to a recursive traversal so tables nested inside wrapper nodes (e.g. Google Docs' <b><div>…</div></b> structure) are found and fixed.

How did you test this change?

E2E tests.

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Project	Deployment	Actions	Updated (UTC)
milkdown-storybook	Ready	Preview, Comment	Mar 22, 2026 1:01pm

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commit: 6d43627