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Add native editable document columns #427

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  1. MA
    MaggieAppleton

    ## Summary

    - Add native, directly editable two-column sections to the restricted MDX dialect and shared Lexical/Yjs registry. - Add `/columns`, keyboard exit, responsive stacking, and content-preserving **Unwrap columns**. - Compose two-image galleries from existing image nodes and editable caption paragraphs; add URL and alt-text repair for existing images.

    ## Preview

    These captures show the real editor on the current `main` layout, with the same gallery side by side in a wide document and stacked in a narrow document.

    ## Checks

    - 4,230 Bun tests and 7 Chromium columns tests pass on the merged branch, including two-reader sync, reconnect, reload, image repair, and no horizontal overflow. - `bun run types`, `bun run ci`, `bun run fix`, and the web build pass.

    ## Current limits

    This slice accepts exactly two top-level columns. Caption styling applies to the paragraph immediately after an image paragraph; the caption remains independent prose. Planner operations do not yet address a nested column separately. The concurrent #415 guidance is unchanged.

    ![Two-image gallery side by side in the current Chopin editor](https://github.com/user-attachments/assets/29d730fd-4fe2-4e21-8107-715f842979ca)

    ![The same gallery and captions stacked in a narrow Chopin editor](https://github.com/user-attachments/assets/029ed128-39b5-44e5-bc60-b0590e397e18)

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  9. coolify-githubnext-app[bot]bot(edited)

    The preview deployment for **chopin** is ready. 🟢

    [Open app](http://427-chopin.githubnext.com) | [Open Build Logs](https://next-appserver.tail49836a.ts.net/project/l9buznc9ua1if0vflxrjwajs/environment/lxqsvczv19eopxk29vfb46mj/application/hb85gdd9mwqqlfwcteflvpbj/deployment/s9outximnflynjgwudhjka0z) | [Open Application Logs](https://next-appserver.tail49836a.ts.net/project/l9buznc9ua1if0vflxrjwajs/environment/lxqsvczv19eopxk29vfb46mj/application/hb85gdd9mwqqlfwcteflvpbj/logs)

    Last updated at: 2026-10-09 13:59:38 CET

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  14. MA
    MaggieAppleton(edited)
    Author

    @copilot remove committed plans here and remove any tests that just prove the implementation vs. guarding against future regressions

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  19. Copilotbot

    > @copilot remove committed plans here and remove any tests that just prove the implementation vs. guarding against future regressions

    Removed the committed implementation plan and the duplicate slash-command unit test; the browser test still covers insertion and caret placement. Commit: `4397c1c`.

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