Local save is synchronous (data safe on disk before returning).
Network upload (file, DAG, BOM) runs in a background QThread.
New files:
- silo_upload_queue.py: UploadTask dataclass + UploadWorker(QThread)
with coalescing, cancel, shutdown, and Qt signals
- silo_status_widget.py: SyncStatusWidget for status bar feedback
Modified:
- silo_commands.py: _extract_dag_data, _extract_bom_data, _enqueue_upload
helpers; Silo_Save and Silo_Commit use async enqueue
- silo_origin.py: saveDocument() saves locally then enqueues async upload
- InitGui.py: upload queue init at 700ms, shutdown handler via atexit
Thread safety: worker never accesses App.Document or Qt widgets;
all data pre-extracted on main thread as plain dicts/strings.
Queue uses threading.Lock; signals cross thread boundary via Qt.
forbes-0023
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