Support Quick Connect

[strugee]

Upstream server 10.7.0 has a new feature called Quick Connect which lets you log in by inputting a code into an existing session: https://www.reddit.com/r/jellyfin/comments/m3y7uz/incase_people_are_wondering_what_quickconnect_is/

I guess Gelli should probably support this, just for parity with other clients? I don't personally care all that much about this though.