A 28-year-old woman is brought to the ED 45 minutes after being found with a scarf tightly wound around her neck by her partner during a domestic dispute. She is conscious, alert, with hoarseness, dysphagia, and mild stridor. Vitals are stable: BP 128/82 mmHg, HR 92/min, RR 18/min, SpO₂ 97% on room air. Neck examination shows ligature marks, mild soft tissue swelling, no obvious tracheal deviation. What is the most appropriate next step in management?