Poor slots. Describe.

describe.header.tsx

type LoginFormProps = {
  header?: boolean;    // ⬅ опа 1️⃣
  title?: React.ReactNode;
  email?: string;
  password?: string;
}

function LoginForm(props: LoginFormProps) {
  return (
    <Form>
      {/* 2️⃣ готово */ }
      {props.header !== false && <div className="header">
        <h2>{props.title || <>Вход</>}</h2>
      </div>}
      
      <div className="fields">
        <Input name="email" value={props.email} />
        <Input name="password" value={props.password} />
      </div>
      
      <div className="controls">
        <Button kind="primary"/>
      </div>
    </Form>
  );
}