A 48-year-old man presents with acute right upper quadrant pain and fever (38.5°C). Ultrasound shows a distended gallbladder with a 2 cm stone impacted in the Hartmann pouch and pericholecystic fluid. Murphy's sign is positive. Laboratory tests reveal WBC 14,000/μL and mildly elevated liver enzymes. The patient is hemodynamically stable. What is the most appropriate immediate management?

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