partial. * * Variables consumed (all optional): * - $pageTitle, $pageDescription, $pageKeywords * - $pageUrl, $pageImage * - $robotsMeta, $googlebotMeta * - $htmlClass -- classes for element (default: 'h-full') * - $bodyClass -- consumed in body partial, declared here for clarity * - $extraHeadLinks -- raw HTML inserted just before (e.g. RSS/Atom s) * - $extraJsonLd -- raw HTML for additional