fix csv format error

backend/app.py

@@ -468,6 +468,7 @@ def get_schedule_week(start: str | None = None) -> dict[str, Any]:
 	return {
 		"start_date": week_start,
 		"items": [_serialize_schedule_row(row) for row in rows],
+		"total_scheduled_tests": len(all_rows),
 		"completion_date": completion_date,
 		"windows": _build_schedule_windows(week_start_date, all_rows, holiday_dates),
 	}