A 28-year-old primigravida delivers a healthy 3.2 kg male infant vaginally at term. On postpartum day 3, she reports severe bilateral breast pain, engorgement, and a low-grade fever (38.2°C). Breasts are firm, tender, and warm to touch. She has been attempting exclusive breastfeeding every 2–3 hours. On examination, there is no localized fluctuance, erythema, or axillary lymphadenopathy. Milk expression yields normal-appearing milk bilaterally. What is the most appropriate immediate management?