A 28-year-old woman from Odisha with borderline tuberculoid (BT) leprosy presents with sudden onset of pain and swelling in the left ulnar and posterior tibial nerves. She has developed new anesthetic patches on the dorsal surface of her left hand and lateral aspect of her left foot over the past 2 weeks. She is on MDT for 3 months. On examination, there is marked nerve thickening and tenderness. Skin smear microscopy shows 2+ acid-fast bacilli. What is the most likely diagnosis?