feat(pages): add targeted practice, drills, hard test modules pages

src/pages/student/drills/page.tsx

@@ -0,0 +1,7 @@
+export const Drills = () => {
+  return (
+    <main className="min-h-screen max-w-7xl mx-auto px-8 sm:px-6 lg:px-8 py-8 space-y-4">
+      Drills
+    </main>
+  );
+};