A 18-month-old boy presents to the pediatric emergency department 6 hours after accidental coin ingestion. He is drooling and refusing feeds but has no respiratory distress. Chest X-ray shows a coin with a round profile on the anteroposterior (AP) view and an edge profile on the lateral view. The structure marked **A** in the diagram indicates the most common site of lodgment in pediatric foreign body ingestion. Given the clinical presentation and radiological findings, what is the most appropriate immediate management?