Function resume_queued_downloads 

pub async fn resume_queued_downloads(
    repository: State<'_, RepositoryManagerWrapper>,
    db: State<'_, DatabaseWrapper>,
    download_manager: State<'_, DownloadManagerWrapper>,
    app: AppHandle,
    handle: String,
) -> Result<ResumeQueuedResult, String>

Resolve the stream URL for every download row that was queued while offline (status = 'pending' AND stream_url IS NULL), then pump the queue so they start. Call this on reconnect.

Audio rows resolve via get_audio_stream_url; video rows (media_type = ‘video’) via the pure get_video_download_url builder using the row’s stored quality_preset — mirroring enqueue_video_downloads. Rows whose URL can’t be resolved are left pending (they retry on the next reconnect).