Closes https://github.com/zed-industries/zed/issues/44630

Content in markdown preview tables now wraps so you can see it all when
it's a table with very long content:

<img width="600" height="692" alt="Screenshot 2026-01-14 at 6  23@2x"
src="https://github.com/user-attachments/assets/ece39852-2e39-406e-a3f0-8ca399ee0be6"
/>

Release Notes:

- Fixed a bug with very wide tables not being fully visible in markdown
previews.