Build Kozmos QR menu site — full implementation

Next.js 16 App Router, TR/EN i18n via [lang] routing and proxy.ts,
Tailwind v4, minimal list menu style, sticky bottom tab bar with
Intersection Observer, PWA manifest, WhatsApp fixed button.

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

app/manifest.ts

@@ -0,0 +1,26 @@
+import type { MetadataRoute } from 'next'
+
+export default function manifest(): MetadataRoute.Manifest {
+  return {
+    name: 'Kozmos Beach & More',
+    short_name: 'Kozmos',
+    description: 'Kozmos Beach & More dijital menüsü',
+    start_url: '/tr',
+    display: 'standalone',
+    orientation: 'portrait',
+    background_color: '#F5F0E8',
+    theme_color: '#3D2B1F',
+    icons: [
+      {
+        src: '/icons/icon-192.png',
+        sizes: '192x192',
+        type: 'image/png',
+      },
+      {
+        src: '/icons/icon-512.png',
+        sizes: '512x512',
+        type: 'image/png',
+      },
+    ],
+  }
+}