Components
Navigation & shell
Header, breadcrumbs, tabs, pagination, the locale switcher, and the two persistent design-system selectors. Mobile product header shows only wordmark + burger; drawer carries nav, locale, account, and footer links.
Selector 1 · Language (product LocaleSwitcher)
EN default / DE secondary. On real pages it switches route (hreflang-correct); in the DS top bar it also live-swaps bilingual specimens and the example preview.
Selector 2 · Viewport
Frames the example-page preview at 390 / 768 / full width for mobile-first QA. (Live control is in the top bar above.)
Specimen content sits below the header so the mobile drawer can be checked as a true overlay.