A 35-year-old woman from Delhi with known chronic hepatitis B (HBeAg-positive, HBV DNA 2.5 × 10^6 IU/mL) presents with acute jaundice, ALT 3200 IU/L, AST 2800 IU/L, and INR 1.4. Anti-HDV is positive; anti-HAV IgM is negative. She is alert, oriented, and has no ascites. Albumin is 3.2 g/dL. What is the most appropriate next step in management?