Fix client directive on admin settings page and install nodemailer

shop/package.json

@@ -21,12 +21,14 @@
     "@react-pdf/renderer": "^4.5.1",
     "@supabase/ssr": "latest",
     "@supabase/supabase-js": "latest",
+    "@types/nodemailer": "^8.0.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "framer-motion": "^12.38.0",
     "lucide-react": "^0.511.0",
     "next": "latest",
     "next-themes": "^0.4.6",
+    "nodemailer": "^9.0.1",
     "radix-ui": "^1.4.3",
     "react": "^19.0.0",
     "react-dom": "^19.0.0",