REFACTOR data service

frontend/src/pages/auth/RegisterPage.tsx

@@ -58,6 +58,16 @@ interface RegisterForm {
   paymentCompleted: boolean;
 }
 
+interface RegisterFormErrors {
+  fullName?: string;
+  email?: string;
+  confirmEmail?: string;
+  password?: string;
+  confirmPassword?: string;
+  acceptTerms?: string;
+  paymentCompleted?: string;
+}
+
 const RegisterPage: React.FC<RegisterPageProps> = ({ onLogin, onNavigateToLogin }) => {
   const { register, isLoading } = useAuth();
   
@@ -73,7 +83,7 @@ const RegisterPage: React.FC<RegisterPageProps> = ({ onLogin, onNavigateToLogin
   
   const [showPassword, setShowPassword] = useState(false);
   const [showConfirmPassword, setShowConfirmPassword] = useState(false);
-  const [errors, setErrors] = useState<Partial<RegisterForm>>({});
+  const [errors, setErrors] = useState<RegisterFormErrors>({});
   const [passwordStrength, setPasswordStrength] = useState<{
     score: number;
     checks: { [key: string]: boolean };
@@ -246,7 +256,7 @@ const RegisterPage: React.FC<RegisterPageProps> = ({ onLogin, onNavigateToLogin
     e.preventDefault();
     
     // Validate form but exclude payment requirement for first step
-    const newErrors: Partial<RegisterForm> = {};
+    const newErrors: RegisterFormErrors = {};
 
     if (!formData.fullName.trim()) {
       newErrors.fullName = 'El nombre completo es obligatorio';
@@ -346,7 +356,7 @@ const RegisterPage: React.FC<RegisterPageProps> = ({ onLogin, onNavigateToLogin
     }));
     
     // Clear error when user starts typing
-    if (errors[name as keyof RegisterForm]) {
+    if (errors[name as keyof RegisterFormErrors]) {
       setErrors(prev => ({
         ...prev,
         [name]: undefined