fix: add scroll to modal content when fullscreen (#38859)

[navinkarkera]

Studio modal doesn't allow authors to scroll when content is longer than the screen height, so this commit adds a max-height based on screen height.

(cherry picked from commit c82accb)

Backport of #38859

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[navinkarkera]

@farhaanbukhsh FYI

[ChrisChV]

@navinkarkera I tested this on a Verawood instance with the coding-eval-xblock. It does let me scroll, but the modal's footer hides the last field.

[navinkarkera]

@ChrisChV I am not able to reproduce it. Have you updated your xblock-ai-evaluation repository with latest opencraft/ulmo branch? We need the changes from this PR: open-craft/xblock-ai-evaluation#53

[ChrisChV]

I am not able to reproduce it. Have you updated your xblock-ai-evaluation repository with latest opencraft/ulmo branch? We need the changes from this PR: open-craft/xblock-ai-evaluation#53

You are right! Sorry. Looks good 👍

[ChrisChV]

👍

• I tested this: I tested the changes in a verawood instance
• I read through the code and considered the security, stability and performance implications of the changes.
• I tested that the UI can be used with a keyboard only (tab order, keyboard controls).