Function player_add_tracks_by_ids 

pub async fn player_add_tracks_by_ids(
    player: State<'_, PlayerStateWrapper>,
    db: State<'_, DatabaseWrapper>,
    repository_manager: State<'_, RepositoryManagerWrapper>,
    repository_handle: String,
    request: AddTracksByIdsRequest,
) -> Result<QueueStatus, String>

Add multiple tracks to queue by IDs - backend fetches metadata and constructs URLs