feat: Add JWT authentication to backend, configure frontend API client, fix streak layout

src/app/dashboard/cbt/page.tsx

@@ -1,5 +1,6 @@
 "use client";
 
+import { fetchWithAuth } from "@/lib/apiClient";
 import { useEffect, useState } from "react";
 import Link from "next/link";
 import { Button } from "@/components/ui/button";
@@ -37,7 +38,7 @@ export default function CBTPage() {
 
     async function loadUser() {
       try {
-        const userRes = await fetch(`/api/users/${userId}`);
+        const userRes = await fetchWithAuth(`/api/users/${userId}`);
         if (!userRes.ok) throw new Error("Failed to load user target exam");
         const userData = await userRes.json();
         const pattern = userData.target_exam;
@@ -75,7 +76,7 @@ export default function CBTPage() {
           setExams(testsData);
         }
 
-        const attemptsRes = await fetch(`/api/users/${userId}/attempts`);
+        const attemptsRes = await fetchWithAuth(`/api/users/${userId}/attempts`);
         if (attemptsRes.ok) {
           const attemptsData = await attemptsRes.json();
           setAttempts(attemptsData);