Fix error when activating MailPoet

[m1r0]

Resolves SEN-26

Proposed Changes

• Fix the MailPoet activation error by moving the initialization to the mailpoet_initialized hook.

Testing Instructions

1. Have the Sensei LMS plugin active.
2. Activate the MailPoet plugin.
3. MailPoet should be activated successfully, and there should be no errors.
4. Make sure the MailPoet initialization is still working as before.

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 critical error that occurred when activating the MailPoet plugin while Sensei LMS is active. The fix defers MailPoet integration initialization to the mailpoet_initialized action hook instead of attempting immediate initialization.

• Moves MailPoet API initialization from initialize_global_objects() to a new initialize_mailpoet() method
• Registers the new method as a callback for the mailpoet_initialized action hook
• Prevents initialization timing conflicts during plugin activation

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
includes/class-sensei.php	Defers MailPoet integration initialization to the mailpoet_initialized hook to prevent activation errors
changelog/fix-mailpoet-error-on-plugin-activation	Documents the bug fix in the changelog

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