The new public landing page (/) was hero-only — missing a language
switcher, legal links, and anything showing what the product actually
looks like. Adds:
- A slim header with the wordmark and a flag-based language switcher
(LanguageSwitcher now shows 🇬🇧/🇩🇪 instead of English/Deutsch text,
used here and everywhere else it's already mounted)
- An app-preview section: a real screenshot of the live feed inside a
browser-chrome mockup card
- A 4-item feature overview (pet-first profiles, posts/stories/video,
health tracking, pet-to-pet messaging)
- A footer with Impressum/Datenschutz/AGB links, matching what the
authenticated sidebar already links to