feat: Implement Two-Factor Authentication (2FA) for enhanced user account security.

src/contexts/AuthContext.jsx

@@ -23,6 +23,16 @@ export function AuthProvider({ children }) {
 
   const login = useCallback(async (email, password) => {
     const res = await api.post('/auth/login', { email, password });
+    if (res.data.requires2FA) {
+      return { requires2FA: true, tempToken: res.data.tempToken };
+    }
+    localStorage.setItem('token', res.data.token);
+    setUser(res.data.user);
+    return res.data.user;
+  }, []);
+
+  const verify2FA = useCallback(async (tempToken, code) => {
+    const res = await api.post('/auth/login/2fa', { tempToken, code });
     localStorage.setItem('token', res.data.token);
     setUser(res.data.user);
     return res.data.user;
@@ -75,7 +85,7 @@ export function AuthProvider({ children }) {
   }, []);
 
   return (
-    <AuthContext.Provider value={{ user, loading, login, register, logout, loginWithOAuth, updateUser }}>
+    <AuthContext.Provider value={{ user, loading, login, verify2FA, register, logout, loginWithOAuth, updateUser }}>
       {children}
     </AuthContext.Provider>
   );