A 32-year-old man with poorly controlled type 2 diabetes (HbA₁c 11.2%) and acute coronary syndrome is admitted to the ICU. He is on metformin and a new SGLT2 inhibitor (empagliflozin). On day 2 of admission, he develops mild metabolic acidosis (pH 7.32, HCO₃⁻ 18 mEq/L) with elevated serum ketones (β-hydroxybutyrate 3.2 mmol/L) despite near-normal blood glucose (180 mg/dL). Urine ketones are positive. What is the most appropriate immediate next step in management?