I have been working on a small browser handoff tool. The use case is intentionally narrow: open a page on one device, scan a QR code with another device, then move live text or one selected file between the two browsers without creating an account, installing an app, or using a cloud drive. This post is less a launch announcement and more a build note. The interesting part was not drawing a QR code. It was deciding what the pairing model should promise, what it should not promise, and how to ...