[todo]: finish implementing [advanced] settings window

[everdro1d]

finish implementation.

potentially distinguish between basic and advanced windows:

• basic: one panel window with basic settings. ideal for only locale change or dark mode switches
• advanced: multi tabbed pane (current status)

should applying prefs read all the panel settings and then put them accordingly?

[everdro1d]

basic settings window completed, advanced... in progress.