refactor: Deplacement du JWT dans le back

Front-End/src/app/500.js

@@ -0,0 +1,15 @@
+import Link from 'next/link'
+import Logo from '../components/Logo'
+
+export default function Custom500() {
+  return (
+    <div className='flex items-center justify-center min-h-screen bg-emerald-500'>
+      <div className='text-center p-6 '>
+        <Logo className="w-32 h-32 mx-auto mb-4" />
+        <h2 className='text-2xl font-bold text-emerald-900 mb-4'>500 | Erreur interne</h2>
+        <p className='text-emerald-900 mb-4'>Une erreur interne est survenue.</p>
+        <Link className="text-gray-900 hover:underline" href="/">Retour Accueil</Link>
+      </div>
+    </div>
+  )
+}