Fix: Email Content Editor for 'Delete Inactive Accounts' is not working

[reygcalantaol]

Resolves https://github.com/WPUserManager/wpum-security/issues/71

Description

The issue affects all email templates and occurs when a theme uses full site editing with the block editor. This happens because block-based themes do not load TinyMCE on admin pages that aren’t part of the site editing experience.

Testing Instructions

1. Activate 'WPUM Security" plugin
2. Navigate to Settigns -> Security -> Cleanup and enable "Delete Inactive Accounts"
3. Navigate to Users > Email > Customize 'Delete Inactive Accounts'.

Pre-review Checklist

• Issue and pull request titles are properly formatted.
• Acceptance criteria have been satisfied and marked in the related issue.
• Unit tests are included (if applicable).
• Self-review of code changes has been completed.
• Self-review of UX changes has been completed.
• Review has been requested from @polevaultweb.

[Copilot]

Pull Request Overview

This PR ensures the TinyMCE editor loads in the email customizer when using block-based themes by explicitly firing footer scripts.

• Adds a block-theme detection in customize_controls()
• Calls admin_print_footer_scripts() to initialize TinyMCE under block themes

Comments suppressed due to low confidence (3)

includes/emails/class-wpum-emails-customizer-scripts.php:86

• Instead of manually calling admin_print_footer_scripts, consider using wp_enqueue_editor() to load TinyMCE and its dependencies. This aligns with WordPress core APIs and reduces risk of duplicate script outputs.

		// This is a workaround to ensure that the tinymce editor is initialized in a block theme.

includes/emails/class-wpum-emails-customizer-scripts.php:87

• [nitpick] Add a comment referencing the related WordPress core issue or the version when block themes stopped loading TinyMCE by default, so future maintainers understand the need for this workaround.

		if ( function_exists( 'wp_is_block_theme' ) && wp_is_block_theme() ) {

includes/emails/class-wpum-emails-customizer-scripts.php:87

• Introduce a test to verify that editor scripts are correctly initialized when wp_is_block_theme() returns true to prevent regression in block-theme contexts.

		if ( function_exists( 'wp_is_block_theme' ) && wp_is_block_theme() ) {