Allow student login using either email or phone number in frontend and backend

server.ts

@@ -200,17 +200,34 @@ app.post('/api/auth/register', async (req: Request, res: Response) => {
 
 // 2. Auth: Login
 app.post('/api/auth/login', async (req: Request, res: Response) => {
-  const { email, password } = req.body;
+  const { email, password } = req.body; // email field represents identifier (email or whatsapp)
   
   if (!email || !password) {
-    res.status(400).json({ error: 'Informe e-mail e senha' });
+    res.status(400).json({ error: 'E-mail ou WhatsApp e senha são obrigatórios' });
     return;
   }
 
   try {
-    const user = await prisma.user.findUnique({
+    let user;
+    if (email.includes('@')) {
+      user = await prisma.user.findFirst({
         where: { email: email.toLowerCase() }
       });
+    } else {
+      const cleanPhone = email.replace(/\D/g, '');
+      const withoutDDI = cleanPhone.replace(/^55/, '');
+      const withDDI = '55' + withoutDDI;
+
+      user = await prisma.user.findFirst({
+        where: {
+          OR: [
+            { whatsapp: cleanPhone },
+            { whatsapp: withoutDDI },
+            { whatsapp: withDDI }
+          ]
+        }
+      });
+    }
 
     if (!user || !user.password) {
       res.status(401).json({ error: 'Credenciais inválidas' });

src/App.tsx

@@ -589,15 +589,15 @@ export default function App() {
               /* LOGIN FORM */
               <form onSubmit={handleLogin} className="space-y-4">
                 <div className="space-y-1">
-                  <label className="text-[10px] text-zinc-400 font-bold uppercase tracking-wider">E-mail</label>
+                  <label className="text-[10px] text-zinc-400 font-bold uppercase tracking-wider">E-mail ou WhatsApp</label>
                   <div className="relative">
                     <Mail className="absolute left-3 top-3 w-4 h-4 text-zinc-500" />
                     <input
-                      type="email"
+                      type="text"
                       required
                       value={loginEmail}
                       onChange={(e) => setLoginEmail(e.target.value)}
-                      placeholder="email@exemplo.com"
+                      placeholder="email@exemplo.com ou 5585981145217"
                       className="w-full glass-input rounded-lg p-3 pl-10 text-xs text-white focus:outline-none"
                     />
                   </div>