fix: await searchParams and params for Next.js 15 async API, compute totalPages in all-users page

thoughts-frontend/app/users/[username]/page.tsx

@@ -21,11 +21,11 @@ import { Button } from "@/components/ui/button";
 import Link from "next/link";
 
 interface ProfilePageProps {
-  params: { username: string };
+  params: Promise<{ username: string }>;
 }
 
 export default async function ProfilePage({ params }: ProfilePageProps) {
-  const { username } = params;
+  const { username } = await params;
   const token = (await cookies()).get("auth_token")?.value ?? null;
 
   const userProfilePromise = getUserProfile(username, token);