Improve the code field design

[voltangle]

I have found a really cool implementation of the 2FA field in RobotsAndPencils/XcodesApp, which looks similar to how 2FA works in Apple apps and also Telegram's official clients.

I will just steal I mean borrow some code from that repo, and tweak it a little so it looks cool

And obviously place credits to @RobotsAndPencils, because it will just be nice to do that

[voltangle]

For now this feature will only be implemented for macOS