Setting custom errors for form fields

const form = useAppForm<z.infer<typeof loginSchema>>({
  defaultValues: { email: "", password: "" },
  validators: { onSubmit: loginSchema },
  onSubmit: async ({ value: data }) => {
    const { ok, error } = await loginFn({ data });

    if (ok) {
      await navigate({ to: "/" });
      return;
    }
  },
});