FormSignal<T> class

Form field signal with validation support.

FormSignal manages form field state with built-in validation, dirty/touched tracking, and error messages.

Example:

class LoginController extends NeuronController {
  late final email = FormSignal<String>(
    '',
    validators: [
      Validators.required('Email is required'),
      Validators.email('Invalid email format'),
    ],
  ).bind(this);

  late final password = FormSignal<String>(
    '',
    validators: [
      Validators.required('Password is required'),
      Validators.minLength(6, 'Password must be at least 6 characters'),
    ],
  ).bind(this);

  bool get canSubmit => email.isValid && password.isValid;
}