A 28-year-old woman from Delhi presents with a 5-day history of high-grade fever, severe retro-orbital pain, myalgia, and a blanching maculopapular rash over the trunk and extremities sparing the palms and soles. On examination, she is alert, blood pressure 110/70 mmHg, heart rate 92 bpm, and has mild hepatomegaly. Laboratory investigations show WBC 3200/μL, platelets 95,000/μL, and elevated transaminases (AST 280 U/L, ALT 160 U/L). What is the most likely diagnosis?