[Feature Request] Shared Network mode: let the sending device display the password/QR instead of the receiver

[jpgjm]

Summary

In Shared Network mode the receiver always generates and displays the password, and the sender always types or scans it. I'd like an option to invert that, so the sending device is the one that displays the password and QR code, and the receiving device is the one that enters or scans it.

Motivation

The QR code path only works when the device showing the code has a screen the other device can point a camera at, and the device reading it has a camera. That's an asymmetry between desktop and mobile, but the current rule assigns the roles by transfer direction, which is a different axis entirely.

Concretely, Windows → Android/iOS is (I'd guess) one of the most common pairs, and it lands on the wrong side of this:

Direction	Displays password	Enters password	QR usable?
Android → Windows	Windows	Android	yes — Android scans the desktop's QR
Windows → Android/iOS	Android	Windows	no — the desktop can't scan a phone screen

So in the Windows → Android direction the QR code is generated on a device nobody can scan it from, and the user has to read a 10-character random string off the phone and type it into the desktop by hand. Half of the transfers lose the feature that exists specifically to avoid that.

The same applies to Linux → Android, and to any desktop → mobile pair.