User:Euphoria/common.js

// Load necessary module asynchronously
mw.loader.using(['mediawiki.util'])
    .then(function () {
        // Select the dropdown, excluding items to be preserved
        $('.vector-menu-dropdown').find(':not(.preserve)').remove();

        // Add a link to the 'p-cactions' portlet pointing to CentralAuth
        var sulLink = mw.util.addPortletLink(
            'p-cactions',
            mw.util.getUrl('Special:CentralAuth/' + mw.user.getName()),
            'SUL',
            'ca-sul',
            'SUL',
            null,
            '#ca-sul'
        );
    });