When a deviced device is selected, clicking Run will now run the app on the device.
Modified IdeDeployStrategy to be able to create a runner for the device, and modified IdeRunManager to override the runtime's runner with one for the device, if necessary.
There are a number of things that could be improved--the project is reinstalled every time you click Run, and transferring flatpak commits by delta is not supported--but it works well enough to use.