saymonsh/BluetoothHFP ? reverse-engineered prompt

Build me a Windows desktop app for connecting an iPhone to a PC so I can route audio more easily.

I want a simple interface that lets me pick my paired iPhone, then separately manage media playback and call audio. It should show clear status for the Bluetooth connection, call transport, and the actual microphone and speaker path, since those can fail independently. I also want a test button to check my mic through my headphones for a few seconds without making a real call.

Please include a wired audio mode too, where I can route phone audio through the PC over the right audio interfaces without Bluetooth pairing. Remember the chosen input and output devices between launches, and make it obvious when routing has stopped or needs to be restarted. If you need current Windows or Flutter details, look them up online and make it work cleanly on desktop.