With 17 years of hands-on experience in IT projects and software development, I am confident in my ability to tackle your Mac Qt proxy issue. Over the years, I have successfully managed and developed various projects that demanded expertise in QT, Linux/Unix, RESTful APIs, and C/C++ - all of which are highly relevant to the task you require assistance for.
Having worked extensively with Mac environments, I have had my fair share of dealing with proxy issues and finding effective solutions. My proficiency extends beyond the browser and into system-level network routing, making me the ideal candidate to tackle this nuanced problem.
By leveraging my deep understanding of multi-threading, data structures, algorithms and network protocols in QT development, I am confident that I can provide an efficient and robust solution that ensures your VPN client seamlessly routes all network traffic - not just the browser's – through the VPN. Let us collaborate and fix this recurring issue to enhance your Mac Qt version's functionality and compatibility.