Hi Arnaud and welcome!
Feel free to submit merge requests to improve ux/css on mobile :-) I'd be more than happy to welcome contributions on this project. If you need guidance please ask.
As…
Would a HTTP basic auth cover your use case? the site administrator can give a password to users and block access to people who don't have a password.
Yes, something like that
All right,…
Indeed, I reproduce. I will look into this. Thanks!
Possibly, the option could be instance-wide, specific to a game or a user preference.
This is intentional. In spirit, Trivabble should behave like a real board, and permit anything a real board permit, and a real board does not lock tiles.
Though we could provide a parameter to…
Good idea. Should be optional, maybe enabled by default, maybe just a warning.