A 38-year-old woman is admitted to the surgical intensive care unit following a high-energy motor vehicle collision. She sustained blunt chest trauma, and an initial chest X-ray revealed a significant right-sided pneumothorax, for which a large-bore chest tube was immediately inserted. Despite proper chest tube placement and suction over the past 48 hours, there is a continuous, voluminous air leak from the chest tube, and serial chest radiographs confirm persistent right lung collapse with no signs of re-expansion. The patient is not intubated but requires supplemental oxygen to maintain adequate saturation and exhibits marked subcutaneous emphysema extending to the neck and face, along with significantly diminished breath sounds over the right hemithorax. Her vital signs are stable, but she is dyspneic. Considering the persistent air leak and non-expansion, what is the most likely underlying diagnosis and the most appropriate definitive management strategy for this patient?