Fixes the confusing "There was a problem parsing the package" experience on Android-10 Portals (Go/Mini/gen-2).
Cause: Immortal installs apps silently via a small shell-privileged helper that doesn't survive a reboot. When it's down, the store was quietly falling back to the system installer dialog — which parse-fails on some apps (notably Play-store split APKs) on Portal's Android 10. Because installs had been silent right after setup, this looked like a regression.
Fix: the App Store and the "Install an APK" browser now detect the helper being down and show a clear note — installs have dropped to the system dialog, some apps may fail to parse there, and reconnecting + re-running the installer restores silent one-tap installs that work for every app. With the helper running, installs are silent and parse-error-free on every model (verified on the Portal Go).
Existing installs update in place.