With the help of Claude and GSD, here is the GSD Web Monitor with alerts. This app helps you keep an eye on GSD in a simple web view and when it stops for your input (to answer a question or do the old '/clear' and next step) it will turn yellow and if you don't notice in 60 seconds, it will turn red & play an alert sound. Everything runs locally on your dev machine and, yes, you can just point your phone to the PC's IP (a QR code is even provided) and keep track of GSD's progress on your phone (local network only).
Actually plugs into Claude Codes' hook system (just like GSD does) and it does not modify GSD itself in any way. This means it should be GSD update proof.
BTW a bonus feature is this works with just Claude Code without GSD too.