spotify: "Spotify", "apple-music": "Apple Music", tidal: "TIDAL", deezer: "Deezer",
    links: "Pasted links",
};

/* Mirrors the backend's detector closely enough to CHOOSE a door; the
   backend decides for real. A paste holding even one track link takes the
   link path, so a list copied out of Spotify never parses as track names. */
const TRACK_LINK = /(?:spotify:track:[A-Za-z0-9]{22})|(?:\/\/(?:open\.spotify\.com\/(?:[\w-]+\/)*track\/|(?:www\.)?deezer\.com\/(?:[\w-]+\/)*track\/|(?:[\w-]+\.)?tidal\.com\/(?:[\w-]+\/)*track\/|music\.apple\.com\/[^\s]*(?:\/song\/|[?&]i=)))/i;