/* the Soulseek listener: the port other peers dial when they download
       from you. Unset means the client's own 50300, read at connect — bind
       walks forward a few ports if it is taken. `set_settings` only assigns
       a port that is Some, so a number typed here can be changed but never
       taken back to unset. */
    const DEFAULT_LISTEN_PORT = 50300;
    function portPrompt() {
        openHalf("prompt", {
            title: "Listening port",
            value: cfg?.listen_port != null ? String(cfg.listen_port) : "",
            placeholder: String(DEFAULT_LISTEN_PORT),
            ok: "Save", numeric: true,
            onsubmit: (v) => {
                const n = Number(v);
                if (!Number.isInteger(n) || n < 1024 || n > 65535) { player.error = "A port is a number between 1024 and 65535."; return; }
                void saveCfg({ listenPort: n });
            },
        });
    }