feat: add Link import for navigation in messages page

- Introduced `Link` from Next.js for improved inter-page navigation.

frontend/src/app/(dashboard)/messages/page.tsx

@@ -3,6 +3,7 @@
 import { formatDistanceToNow } from "date-fns";
 import { fr } from "date-fns/locale";
 import { Search, Send, UserPlus, X } from "lucide-react";
+import Link from "next/link";
 import { useRouter, useSearchParams } from "next/navigation";
 import * as React from "react";
 import { toast } from "sonner";