I need reliable help debugging the page at https://formsigny.com/new/pdfj/. When I open it on any iPhone browser, the interface works for about five minutes and then the entire screen stops responding. The same link runs fine on Android and desktop, so the fault appears to be iOS-specific. Your task is to: • Reproduce the freeze on a physical iPhone. • Trace and isolate the underlying cause—whether it stems from a JavaScript loop, memory leak, Safari WebKit quirk, or an iOS security throttle. • Implement and document a clean fix in the existing codebase (plain JS and any libraries already loaded on the page). • Verify stability with at least 15 minutes of continuous use, including scrolling, zooming, and form editing. • Provide a concise change log and recommendations to prevent similar mobile issues. I’ll grant access to the repository once we agree on the approach. If you’ve solved comparable iOS WebKit freezes before, especially on interactive PDF or canvas-based scripts, I’m eager to see your strategy and timeframe.