fix: login — setUser après auth pour maj header immédiate

frontend/src/pages/LoginPage.tsx

@@ -1,6 +1,7 @@
 import { useState } from 'react';
 import { Link, useNavigate, useLocation } from 'react-router-dom';
 import { apiFetch } from '../lib/api';
+import { useAuthContext, type User } from '../context/AuthContext';
 
 const PROVIDERS = [
   { id: 'discord', label: 'Discord' },
@@ -12,6 +13,7 @@ const PROVIDERS = [
 export default function LoginPage() {
   const navigate = useNavigate();
   const location = useLocation();
+  const { setUser } = useAuthContext();
   const from = (location.state as { from?: Location })?.from?.pathname ?? '/';
   const base = import.meta.env.VITE_SUPEROAUTH_URL;
   const redirectUrl = encodeURIComponent(window.location.origin + '/callback');
@@ -27,10 +29,11 @@ export default function LoginPage() {
     setLoading(true);
     setError(null);
     try {
-      await apiFetch('/auth/login', {
+      const res = await apiFetch<{ success: boolean; data: { user: User } }>('/auth/login', {
         method: 'POST',
         body: JSON.stringify({ email, password }),
       });
+      setUser(res.data.user);
       navigate(from, { replace: true });
     } catch {
       setError('Email ou mot de passe incorrect.');