fix(markdown): preserve links, trailing breaks and table images

[felixfeng33]

• Auto release

Plan: Markdown regression fixes

Why

Markdown export can fail for bare URLs in headings and sized images in table cells, or lose trailing breaks in paragraphs and list items. Fix the shared conversion rules so these documents survive export and import.

Scope

• Correct HTML content classification and reuse paragraph encoding for list items, including CRLF and trailing breaks.
• Preserve registered childless block tags in table cells, with a regression test for image width.
• Update the existing package changeset, Markdown documentation and generated registry output. HTML/DOCX conversion and preview UI are unchanged.

Tradeoffs

Keep line-break handling in the paragraph encoder and tag handling in the existing converter. Avoid image-specific serialization and exported-string post-processing.

Blast Radius

The shared Markdown converter is affected. No public API or editor schema changes. Tags with child content are outside the new table behavior.

Verification

• Markdown partition: 275 passed; list partition: 49 passed; slow CommonMark cases: 28 passed. Markdown typecheck and scoped lint passed.
• Registry generation freshness and source checks passed after rebasing onto next.
• Original development-page import/export replay covered all four fixes. Four saved downloads passed against the final parser. The PR panel found a CRLF regression; its new case failed before the producer fix and passed afterward, and the second round found no further issue.

Full repository checks, production builds and the browser engine matrix were not run. Browser replay predates the final classifier and CRLF cleanup.

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Latest commit: e1fb012

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platejs	Major

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