the email is [email protected] but they are gonna ask you the same questions.
Linux version not switching themes automatically is known bug.
https://forum.obsidian.md/t/color-scheme-adapt-to-system-not-working-on-linux-fedora-gnome/38743
The rest of your problems is likely some configuration issue, but if you don’t have the patience to go through the settings and the logs with us, we can’t help you.