Function login_with_into 

pub async fn login_with_into<H, C, B, X>(
    http: &H,
    clock: &C,
    hooks: LoginHooks<'_, B>,
    cancel: &X,
    persist_key: Option<&str>,
) -> Result<OAuthCredentials, KimiAuthError>
where
    H: KimiHttp,
    C: KimiClock,
    B: KimiBrowser,
    X: KimiCancel + ?Sized,

Like login_with but persists ONLY into persist_key when given (kimi-code or kimi-code@<label>).