Function resume_download 

pub async fn resume_download(
    app: AppHandle,
    db: State<'_, DatabaseWrapper>,
    download_manager: State<'_, DownloadManagerWrapper>,
    download_id: i64,
) -> Result<(), String>

Resume a paused download.

Flipping the row back to pending is likewise not enough on its own: the pump is not a poller, it runs when something calls it, so a resumed download sat untouched until some unrelated event happened to pump the queue. That is the other half of “resume does not work”.

TRACES: UR-055 | DR-168