SD ownership switching

flowchart TD
Quiesce["Wi-Fi, LoRa, GPS, track, and file owners quiesce"] --> Unmount
Unmount --> USB["host owns media"]
USB --> Stop
Stop --> Remount
Remount --> Resume["restore screen, GPS, LoRa, then Wi-Fi"]
Quiesce -- fail --> Restore
Unmount -- fail --> Restore