Function login_with 

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

Device start → user prompt → poll → atomic persist.