Tray icon/indicator Fix

[stkrknds]

Hello this is a fix for the tray icon/indicator issue. After running the tests, I got an error about putting await inside of a loop. So unfortunately, I had to change the selector of the sidebar and remove the loop.

Partially fixes #1825 (this wouldn't implement notifications).

Fixes #1995
Fixes #1823
Fixes #2031

[dusansimic]

Thanks @stkrknds for the contribution! I've suggested some changes so once they're implemented, we can merge this.

[stkrknds]

I have made some changes, so that only the left sidebar is observed for the chats icon. I think that's the best that can be done in terms of efficiency. The only downside is that there is now an additional selector(for the left sidebar) which may break in the future.

[dusansimic]

The only downside is that there is now an additional selector(for the left sidebar) which may break in the future.

That is true, but I think it's better to have a new selector that can be fixed than having one more mutation observer that checks a lot of elements on the page for changes. That would consume more resources and in turn make Caprine slower and more resource hungry which is already an issue. I think the path forward is either optimizing existing observer or removing them altogether.