feat: implement CMS-driven navigation with dropdown submenus

Bypass broken contracts client navigation filter (queries non-existent
'type' field) with direct fetch to /api/navigations. Transform CMS
mainMenu structure (page/custom/submenu types) into NavItem format.
Replace JS-state dropdown (AnimatePresence) with pure CSS group-hover
to fix SSR hydration issues where both dropdowns opened simultaneously.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/app/layout.tsx

@@ -42,15 +42,44 @@ export default async function RootLayout({
     getSocialLinks(),
   ])
 
-  // Transform CMS navigation items into NavItem format
+  // Transform CMS navigation into NavItem format
   const nav = navigation as unknown as Record<string, unknown> | null
-  const navItems = nav?.items
-    ? (nav.items as Array<Record<string, unknown>>).map(
-        (item) => ({
-          label: (item.label as string) || '',
-          href: (item.link as string) || (item.url as string) || '#',
+  const mainMenu = (nav?.mainMenu || nav?.items) as Array<Record<string, unknown>> | undefined
+
+  function pageSlugToHref(page: Record<string, unknown> | null): string {
+    if (!page?.slug) return '#'
+    return page.slug === 'startseite' ? '/' : `/${page.slug}`
+  }
+
+  function buildSubmenuItems(items: Array<Record<string, unknown>>): { label: string; href: string }[] {
+    return items.map((sub) => {
+      const subPage = sub.page as Record<string, unknown> | null
+      const subUrl = sub.url as string | null
+      const linkType = sub.linkType as string
+      return {
+        label: (sub.label as string) || '',
+        href: linkType === 'page' ? pageSlugToHref(subPage) : (subUrl || '#'),
+      }
+    })
+  }
+
+  const navItems = mainMenu?.length
+    ? mainMenu.map((item) => {
+        const type = item.type as string
+        const page = item.page as Record<string, unknown> | null
+        const submenu = item.submenu as Array<Record<string, unknown>> | undefined
+        const children = submenu?.length ? buildSubmenuItems(submenu) : undefined
+
+        let href = '#'
+        if (type === 'page') href = pageSlugToHref(page)
+        else if (type === 'custom') href = (item.url as string) || '#'
+
+        return {
+          label: (item.label as string) || '',
+          href,
+          children,
+        }
       })
-      )
     : [
         { label: 'Home', href: '/' },
         { label: 'Der Mensch', href: '/mensch' },

src/components/Navigation.tsx

@@ -22,7 +22,6 @@ interface NavigationProps {
 export function Navigation({ items, logo, transparent = false }: NavigationProps) {
   const [scrolled, setScrolled] = useState(false)
   const [mobileOpen, setMobileOpen] = useState(false)
-  const [activeDropdown, setActiveDropdown] = useState<string | null>(null)
   const pathname = usePathname()
 
   useEffect(() => {
@@ -75,10 +74,8 @@ export function Navigation({ items, logo, transparent = false }: NavigationProps
         <div className="hidden lg:flex items-center gap-8">
           {items.map((item) => (
             <div
-              key={item.href}
-              className="relative"
-              onMouseEnter={() => item.children && setActiveDropdown(item.href)}
-              onMouseLeave={() => setActiveDropdown(null)}
+              key={item.label}
+              className="group relative"
             >
               <Link
                 href={item.href}
@@ -93,16 +90,17 @@ export function Navigation({ items, logo, transparent = false }: NavigationProps
                 {item.label}
               </Link>
 
-              {/* Dropdown */}
-              <AnimatePresence>
-                {item.children && activeDropdown === item.href && (
-                  <motion.div
-                    initial={{ opacity: 0, y: 10 }}
-                    animate={{ opacity: 1, y: 0 }}
-                    exit={{ opacity: 0, y: 10 }}
-                    transition={{ duration: 0.2 }}
-                    className="absolute top-full left-0 mt-3 py-5 pb-2.5 min-w-[200px] bg-white/95 border border-light"
+              {/* Dropdown — hidden by default, shown on group hover via CSS */}
+              {item.children && (
+                <div
+                  className={cn(
+                    'absolute top-full left-0 pt-3 min-w-[200px]',
+                    'opacity-0 invisible translate-y-2',
+                    'group-hover:opacity-100 group-hover:visible group-hover:translate-y-0',
+                    'transition-all duration-200'
+                  )}
                 >
+                  <div className="py-5 pb-2.5 bg-white/95 border border-light">
                     {item.children.map((child) => (
                       <Link
                         key={child.href}
@@ -119,9 +117,9 @@ export function Navigation({ items, logo, transparent = false }: NavigationProps
                         {child.label}
                       </Link>
                     ))}
-                  </motion.div>
+                  </div>
+                </div>
               )}
-              </AnimatePresence>
             </div>
           ))}
         </div>
@@ -149,7 +147,7 @@ export function Navigation({ items, logo, transparent = false }: NavigationProps
           >
             <div className="py-4">
               {items.map((item) => (
-                <div key={item.href}>
+                <div key={item.label}>
                   <Link
                     href={item.href}
                     className="block px-4 py-3 font-heading uppercase text-[0.85em] tracking-[2px] text-gray-light hover:text-dark border-none"

src/lib/api.ts

@@ -50,9 +50,17 @@ export async function getPosts(options: {
 }
 
 // Navigation
-export async function getNavigation(type: "header" | "footer" | "mobile" = "header") {
+// Note: cms.navigation.getNavigation filters by a non-existent 'type' field,
+// causing API errors. Query the collection directly instead.
+export async function getNavigation(_type: "header" | "footer" | "mobile" = "header") {
   try {
-    return await cms.navigation.getNavigation(type, { depth: 2 })
+    const baseUrl = process.env.NEXT_PUBLIC_PAYLOAD_URL || "https://cms.c2sgmbh.de"
+    const tenantId = process.env.NEXT_PUBLIC_TENANT_ID || "4"
+    const url = `${baseUrl}/api/navigations?where[tenant][equals]=${tenantId}&limit=1&depth=2&locale=de`
+    const res = await fetch(url, { next: { revalidate: 60, tags: ["navigations"] } })
+    if (!res.ok) return null
+    const data = await res.json() as { docs?: Record<string, unknown>[] }
+    return data?.docs?.[0] || null
   } catch {
     return null
   }