Scroll-back gesture on Mac still goes back

Despite https://github.com/flutter/devtools/issues/8661 being addressed, I'm still having issues with left-scrolling causing the browser to go back:

<img width="600"  alt="Image" src="https://github.com/user-attachments/assets/3e28adc5-5df0-4caa-afbc-56c6b9806264" />

<video width="600" src="https://github.com/user-attachments/assets/51283243-7701-434d-81ce-ee3f94580df1" />
