Issue #3586451: Allow to use MDX Editor in Text plain widget

Description

Testing instructions

  1. After checking out the code, the MDX editor needs to be built:
  • go to web/modules/contrib/ai/ui/mdxeditor folder
  • run npm install
  • run npm run build
  1. Create a Text (plain, long) field for any entity.
  2. Go to "Manage form display"
  3. Click on configure icon near the field
  4. There should be a 3rd party setting "Use MDX editor"
  5. If you check it and save, the field will have the editor instead of plain textarea.

Checklist

  • I have linked the related issue in the MR title or description
  • I have performed a self-review of my own code
  • I have added or updated tests, or explained in the description why this change is not covered by tests
  • I have updated documentation for any new or changed functionality
  • I have written testing instructions and verified them locally
  • I have noted any required post-merge steps (config imports, cache rebuilds, manual changes)
  • This MR contains no breaking API or hook changes, or they are explicitly documented in the description

AI Compliance

Note

Check the one that best describes your usage, or leave all unchecked if AI was not significantly used.

  • AI Assisted Code
    Mainly written by a human; AI used for autocomplete or partial generation under full human supervision.

  • AI Generated Code
    Mainly generated by AI, reviewed and approved by a human before this MR was created.

  • Vibe Coded
    Generated by AI and only functionally reviewed before this MR was created.

Closes #3586451

Merge request reports

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