feat: add memoization, unified search hook, pagination, and SEO meta tags

src/app/api/courses/route.ts

@@ -9,7 +9,8 @@ export async function GET(request: Request): Promise<NextResponse<PaginatedRespo
   }
 
   const { searchParams } = new URL(request.url);
-  const limit = searchParams.get('limit') || '10';
+  const limit = parseInt(searchParams.get('limit') || '10', 10);
+  const cursor = searchParams.get('cursor');
 
   const courses = [
     {
@@ -53,10 +54,16 @@ export async function GET(request: Request): Promise<NextResponse<PaginatedRespo
     },
   ];
 
+  const startIndex = cursor ? parseInt(cursor, 10) : 0;
+  const page = courses.slice(startIndex, startIndex + limit);
+  const nextIndex = startIndex + limit;
+  const nextCursor = nextIndex < courses.length ? String(nextIndex) : undefined;
+
   return addHeaders(
     NextResponse.json({
-      data: courses.slice(0, parseInt(limit)),
+      data: page,
       total: courses.length,
+      nextCursor,
     }),
   );
 }

src/app/dashboard/layout.tsx

@@ -0,0 +1,20 @@
+import type { Metadata } from 'next';
+
+export const metadata: Metadata = {
+  title: 'Dashboard | TeachLink',
+  description: 'Track your learning progress, manage downloaded courses, and continue where you left off.',
+  openGraph: {
+    title: 'Dashboard | TeachLink',
+    description: 'Track your learning progress and continue your courses.',
+    type: 'website',
+  },
+  twitter: {
+    card: 'summary',
+    title: 'Dashboard | TeachLink',
+    description: 'Track your learning progress and continue your courses.',
+  },
+};
+
+export default function DashboardLayout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}

src/app/page.tsx

@@ -1,6 +1,22 @@
+import type { Metadata } from 'next';
 import CourseCard from './components/courses/CourseCard';
 import Link from 'next/link';
 
+export const metadata: Metadata = {
+  title: 'TeachLink - Offline Learning Platform',
+  description: 'Learn anywhere, anytime with offline capabilities. Access courses, track progress, and study without an internet connection.',
+  openGraph: {
+    title: 'TeachLink - Offline Learning Platform',
+    description: 'Learn anywhere, anytime with offline capabilities.',
+    type: 'website',
+  },
+  twitter: {
+    card: 'summary_large_image',
+    title: 'TeachLink - Offline Learning Platform',
+    description: 'Learn anywhere, anytime with offline capabilities.',
+  },
+};
+
 export default function Home() {
   return (
     <div className="min-h-screen bg-gradient-to-br from-gray-900 via-gray-800 to-gray-900 text-white">

src/app/profile/layout.tsx

@@ -0,0 +1,20 @@
+import type { Metadata } from 'next';
+
+export const metadata: Metadata = {
+  title: 'Profile | TeachLink',
+  description: 'Manage your TeachLink profile, preferences, and account settings.',
+  openGraph: {
+    title: 'Profile | TeachLink',
+    description: 'Manage your TeachLink profile and account settings.',
+    type: 'profile',
+  },
+  twitter: {
+    card: 'summary',
+    title: 'Profile | TeachLink',
+    description: 'Manage your TeachLink profile and account settings.',
+  },
+};
+
+export default function ProfileLayout({ children }: { children: React.ReactNode }) {
+  return <>{children}</>;
+}