Login form has zero validation

[anoopcodehack]

File: client/src/pages/Login.jsx

Problems:

• Empty email/password submits the form
• No password minimum length check
• Email format not validated

Fix: before calling handleSubmit, check:
if (!form.email.includes("@")) → show error
if (form.password.length < 6) → show error
if (isRegister && !form.name.trim()) → show error