Photosynth only has mobile apps for Windows Phone 7 (Windows Phone 8 very soon) and iOS. Android has no Photosynth mobile panorama app yet.
Photosynth's HTML5 panorama viewer debuted on iOS' Mobile Safari in 2011, however has always used the entire browser windows, and yes, you are correct, it does not support highlights or loading higher resolutions.
The Photosynth mobile app absolutely should support loading higher resolutions and highlights, however.
Additionally, when launching Photosynth's mobile app from the HTML5 viewer in Safari, I have never received any "Cannot Open Page - Safari cannot open the page because the address is invalid" message. The URI used is designed to tell the host OS (in this case iOS) to use the Photosynth app to open the specific panorama/collection, but normally, this should either launch the app in one touch or send you to the app store to get it if you don't already have it installed.