feat: [FC-0070] Listen to xBlock interaction events

[PKulkoRaccoonGang]

🚨 Dependencies:

• 🔗 frontend-app-authoring PR

Description

This PR introduces several changes to improve the handling of XBlock events and the user interface in the CMS. The most important changes include adding event listeners for message handling, refining the postMessage logic, and updating the CSS for better visual consistency.

Testing instructions

Screen.Recording.2024-11-15.at.15.52.27.mov

[openedx-webhooks]

Thanks for the pull request, @PKulkoRaccoonGang!

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[PKulkoRaccoonGang]

[inform]: This change is temporary and will be removed after this PR #35828 is merged.

[arbrandes]

#35828 has merged. Will the conditional be removed?

[PKulkoRaccoonGang]

Yes 💯

[bradenmacdonald]

Code looks good to me now 👍🏻. Is there someone else who is testing this or do you need me to?

[PKulkoRaccoonGang]

Code looks good to me now 👍🏻. Is there someone else who is testing this or do you need me to?

@bradenmacdonald thanks for taking the time to look at this PR! I think it would be great if @arbrandes took another look.