webui: fix chat header width when sidebar is closed

[polydecay]

This fixes a small issue where the chat header was not resized to fill the screen width when collapsing the sidebar manually. I also copied the transition style duration-200 ease-linear from the sidebar button to match the animation.

[ddh0]

Thank you !!

[allozaur]

Sth is not passing CI here... Is everything alright with the .html.gz file?

[polydecay]

I believe so, it might be the base master commit that's bad. I'll try rebasing and building again.

Edit: I rebased and rebuilt the index.html.gz file, then manually downloaded it from here and served the html page, and everything seems to be good from what I can tell.

The previous CI errors are gone after the rebase, but it's now failing on another test instead. Looking at the logs it does not seem to be related to my changes. Do you want me to keep rebasing?

[CISC]

The previous CI errors are gone after the rebase, but it's now failing on another test instead. Looking at the logs it does not seem to be related to my changes. Do you want me to keep rebasing?

It failed because the cache disappeared between jobs, will be fixed once #18116 gets merged.

[allozaur]

@polydecay i've merged #18116 so please rebase on master and retry running the CI :)