A 52-year-old man from Delhi presents with a 3-month history of progressive dyspnea, chest pain, and palpitations. Physical examination reveals elevated JVP and a pericardial friction rub. ECG shows diffuse ST elevation. Chest X-ray reveals cardiomegaly with bilateral hilar lymphadenopathy. Transbronchial biopsy shows non-caseating granulomas. Endomyocardial biopsy demonstrates granulomatous infiltration of the myocardium with giant cells. Serum ACE is elevated. What is the most likely diagnosis?