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

src/app/dashboard/page.tsx

@@ -1,5 +1,6 @@
 "use client"
 
+import { fetchWithAuth } from "@/lib/apiClient";
 import { useRef, useState, useEffect } from "react"
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
 import { Badge } from "@/components/ui/badge"
@@ -26,7 +27,7 @@ export default function DashboardPage() {
     }
     async function fetchStats() {
       try {
-        const res = await fetch(`/api/users/${currentUserId}/stats`)
+        const res = await fetchWithAuth(`/api/users/${currentUserId}/stats`)
         if (res.ok) {
           const data = await res.json()
           setUserStats(data)