web: adopt Cache Components, Partial Prefetching and ensureStatic

web/src/app/kontakt/page.tsx

@@ -5,6 +5,9 @@ import {
 } from "@/components/contact/ContactIndexView";
 import { getSeoMetadata } from "@/lib/seo";
 
+// Fail the build if this route stops being fully prerendered
+export const ensureStatic = "navigation";
+
 export async function generateMetadata(
   _: unknown,
   parent: ResolvingMetadata