A 62-year-old male with 40 pack-year smoking history presents with persistent hoarseness, dysphagia, and otalgia for 4 months. Laryngoscopy reveals a large supraglottic mass involving the epiglottis and aryepiglottic folds with restricted vocal cord mobility on the left side. CT neck shows the tumor invading the thyroid cartilage and a 2 cm ipsilateral level II lymph node. There are no distant metastases. Which of the following is the most appropriate definitive treatment?