A 35-year-old man of Gujarati descent presents with a 2-year history of progressive photosensitivity, blistering lesions on the dorsal surfaces of hands and forearms, and hyperpigmentation of sun-exposed areas. He also reports dark urine and mild hepatomegaly on examination. Liver function tests show elevated transaminases (AST 85 U/L, ALT 92 U/L) and mild elevation of GGT. Serum ferritin is elevated at 420 ng/mL. Urine analysis shows elevated uroporphyrin (>1000 μmol/24 h) and coproporphyrin. Fecal porphyrins are normal. Plasma porphyrins are normal. Which of the following is the most likely diagnosis?