Alas vaultwarden is a vault and a web interface only. Not a browser integration, not a desktop app, not an android / iOS client that can autofill passwords.
It’s very good, I’m using it myself with the official clients. I’m just afraid Bitwarden will start removing the possibility to use a self hosted vault or make it a feature you have to pay for.
Unsure, I am using kitty with a very minimal config on MacOS and it works well. Haven’t had any bugs. Seems more like marketing to me (the image)