pub fn spawn<D, H>(app_handle: AppHandle, handler: H)where
D: Clone + Send + Sync + Serialize + DeserializeOwned + 'static,
H: BatchItemHandler<D> + 'static,Expand description
Spawn the background batch executor as a tokio task.
The executor polls the queue at poll_interval (default 2s) and
processes one batch at a time. Progress events are emitted for each item.
The BatchQueue<D> must be registered in Tauri’s managed state.