Dark mode for "Sign In" page

[ryandey]

Is there an existing issue for this?

• I have searched the existing open and closed issues

Is your feature request related to a problem? Please describe

Sign in screen does not have dark mode, even if the app itself is in dark mode.

Describe the solution you'd like

I'd like to have the sign in page with dark mode functionality just as the application itself has. Ideally with support for system theme mode, too.

Describe alternatives you've considered

Using Dark Reader extension works fine, but I figure if the app has it, the sign in page should too.

Anything else?