Fix links inside dynamically updated markdown tables

[VedK5643]

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Link to issue or discussion

#6597

Summary

Fixes #6597.

When Markdown content is updated dynamically (for example via Markdown.append()), table cells are created using Static instead of MarkdownTableCellContents.

Because Static doesn't implement action_link(), links inside dynamically updated Markdown tables appear interactive but clicking them has no effect.

This change uses MarkdownTableCellContents consistently for dynamically created table cells so that link click events are handled correctly.

Changes

• Replace Static with MarkdownTableCellContents in the dynamic table rendering path.
• Add a regression test covering dynamically updated Markdown tables.
• Verify existing Markdown tests continue to pass.

Testing

• Added a regression test reproducing Issue Links inside markdown tables are not clickable #6597.
• Verified the regression test fails on the original implementation.
• Verified it passes with this change.
• Ran the Markdown test suite successfully.