A 52-year-old man from Delhi presents with a 6-month history of a painless, slow-growing swelling in the right parotid region. On examination, the mass is firm, fixed to the underlying tissues, and the overlying skin shows a slight dimple. There is mild facial nerve involvement with drooping of the right angle of mouth. Fine needle aspiration cytology (FNAC) shows epithelial cells arranged in nests with myoepithelial cells. What is the most likely diagnosis?