Options for selecting dark theme, fix some white flashes when in dark mode (#2722)

* add dark theme selection to settings/schema

* use `useThemePrefs` where needed

* adjust theme providers to support various themes

* update storybook

* handle web themes

* better themeing for web

* dont show dark theme prefs when color mode is light

* drop the inverted text change on oled theme

* get the color mode inside of `useColorModeTheme`

* use `ThemeName` type everywhere

* typo

* use dim/dark instead of dark/oled

* prevent any fickers on web

* fix styles

* use `dim` for dark default

* more cleanup

* 🤔

* set system background color

* ts

src/state/shell/index.tsx

@@ -14,7 +14,7 @@ export {
   useSetDrawerSwipeDisabled,
 } from './drawer-swipe-disabled'
 export {useMinimalShellMode, useSetMinimalShellMode} from './minimal-mode'
-export {useColorMode, useSetColorMode} from './color-mode'
+export {useThemePrefs, useSetThemePrefs} from './color-mode'
 export {useOnboardingState, useOnboardingDispatch} from './onboarding'
 export {useComposerState, useComposerControls} from './composer'
 export {useTickEveryMinute} from './tick-every-minute'