Bump WordPress Tested up to version 7.0

[qasumitbagthariya]

Description of the Change

Closes #202

How to test the Change

1. Run the e2e test using GitHub action to test this PR.
2. Do thorough manual visual validation, with a strong focus on the admin interface

Changelog Entry

Dev - Bump WordPress "tested up to" version 7.0.
Dev - Bump WordPress minimum supported version to 6.6.

Credits

Props @username, @username2, ...

Checklist:

• I agree to follow this project's Code of Conduct.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests pass.

[qasumitbagthariya]

QA Update ❌

---

Issue 1:

When saving the settings, the settings page turns blank for a few seconds, while the “settings saved” notice appears at the top. After a few seconds, the page reloads and displays normally again.

Steps to Reproduce:

1. Navigate to the settings page
2. Make any changes
3. Click on the Save button

Expected Result:

1. The settings page should reload or update smoothly without showing a blank screen
2. The success notice should appear without any UI flicker or disruption

Screen.Recording.2026-03-27.at.1.43.24.PM.mov

cc @iamdharmesh

[vikrampm1]

@iamdharmesh this appears to be awaiting your review. It would be good to take a look and move this forward to the next step. Thanks!

[Copilot]

Pull request overview

Updates plugin compatibility metadata for upcoming WordPress 7.0 and aligns tooling/CI with the new minimum supported WordPress version. In addition, this PR introduces a small refactor for admin notice rendering and a minor admin UI styling adjustment.

Changes:

• Bump “Tested up to” to WordPress 7.0 and minimum supported WordPress version to 6.6 (readme + plugin header + PHPCS + CI matrix).
• Introduce Mailchimp_Admin_Notices for centralized admin notice rendering and convert legacy notice helpers into wrappers.
• Adjust admin radio button checked styling in admin.css.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
readme.txt	Updates “Tested up to” to 7.0.
phpcs.xml	Raises minimum_supported_wp_version to 6.6.
mailchimp.php	Raises plugin header “Requires at least” to 6.6 and loads new admin notices class.
includes/class-mailchimp-admin.php	Initializes the new admin notices system during admin bootstrap.
includes/admin/class-mailchimp-admin-notices.php	Adds a new centralized admin notice queue/renderer.
includes/admin/admin-notices.php	Converts legacy notice functions into wrappers around the new class.
assets/css/admin.css	Tweaks checked radio background styling.
.github/workflows/e2e.yml	Updates CI “WP minimum” to run against WordPress 6.6.

Comments suppressed due to low confidence (2)

includes/admin/class-mailchimp-admin-notices.php:116

• Because the allowed HTML for links permits target, it should also permit rel (and ideally ensure noopener noreferrer when target="_blank" is used). As-is, any provided rel attribute will be stripped by wp_kses, making it harder to avoid reverse-tabnabbing issues.

		$allowed_html = array(
			'a'      => array(
				'href'   => array(),
				'title'  => array(),
				'target' => array(),
			),
			'strong' => array(),

includes/admin/admin-notices.php:30

• This docblock also uses the placeholder "@SInCE x.x.x". Please update it to the actual version (or remove the placeholder) before merge/release.

 * Display error admin notice.
 * This function is now a wrapper around the Mailchimp_Admin_Notices class, will be deprecated in future versions. Use that class instead.
 *
 * @since 1.7.0
 * @since x.x.x - Moved notice rendering to class-mailchimp-admin-notices.php
 *

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