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

thoughts-frontend/app/search/page.tsx

@@ -5,11 +5,12 @@ import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
 import { ThoughtList } from "@/components/thought-list";
 
 interface SearchPageProps {
-  searchParams: { q?: string };
+  searchParams: Promise<{ q?: string }>;
 }
 
 export default async function SearchPage({ searchParams }: SearchPageProps) {
-  const query = searchParams.q || "";
+  const { q } = await searchParams;
+  const query = q || "";
   const token = (await cookies()).get("auth_token")?.value ?? null;
 
   if (!query) {