Add flag for having fake test devices
Currently It's not possible to test Teleport effectively without having access to 2 machines, which is very annoying.
I propose adding a command line flag that automatically adds some test devices to the view. If we want to go even further, we could show the notifications the receiver would get on the sender's device and actually transfer the file to their download directory.
It could look something like this:
flatpak run com.frac_tion.teleport --test-devices 3
which would add 3 test devices with random names.