Fix stylesheet not loading for Divi theme

[donnapep]

Resolves #7863.

Proposed Changes

Fixes typo in path of custom Divi styles.

Testing Instructions

Pre-Merge Checklist

• PR title and description contain sufficient detail and accurately describe the changes
• Adheres to coding standards (PHP, JavaScript, CSS, HTML)
• All strings are translatable (without concatenation, handles plurals)
• Follows our naming conventions (P6rkRX-4oA-p2)
• Hooks (p6rkRX-1uS-p2) and functions are documented
• New UIs are responsive and use a mobile-first approach
• Code is tested on the minimum supported PHP and WordPress versions

[Copilot]

Pull request overview

This PR fixes a typo in the stylesheet path for the Divi theme integration, correcting "div" to "divi" to ensure the Learning Mode stylesheet loads properly in the admin interface.

• Corrected the path from css/3rd-party/themes/div/learning-mode.css to css/3rd-party/themes/divi/learning-mode.css

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[m1r0]

I can confirm that this fixes it. Thanks, Donna!

[m1r0]

I've reverted this because there are issues with the site editor.