Your “battery saver” should notify you at the configured threshold. You can customize the notification when it is in your notification tray if you need an attention grabber.

I don’t know of a stock method in LOS for choosing power-off at a configured threshold, so the other comments’ recommendation for apps could be useful.

Edit: typo

https://www.teepublic.com/t-shirt/71732414-its-always-dns

Its always DNS.

But seriously, I’m not familiar with qui, but there could be a whitelist approach to access by default. Maybe it’s blocking access until you whitelist or configure it to accept all.

Its not likely your local firewall is an issue since you can access other services, but the fact that you don’t know means you should find out. I think Debian uses ufw by default, but I think Debian ships with it disabled.

After reading your post body, I realize this isn’t what you’re looking for, but at least for honorable mention reasons:

https://openlearning.mit.edu/courses-programs/mit-opencourseware

How about OsmAnd? Is that still a decent project without world domination plans? I actually have CoMaps as well, but have sort of stuck to using OsmAnd.