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/view/screens/Settings.tsx

@@ -40,8 +40,8 @@ import {RQKEY as RQKEY_PROFILE} from '#/state/queries/profile'
 import {useModalControls} from '#/state/modals'
 import {
   useSetMinimalShellMode,
-  useColorMode,
-  useSetColorMode,
+  useThemePrefs,
+  useSetThemePrefs,
   useOnboardingDispatch,
 } from '#/state/shell'
 import {
@@ -144,8 +144,8 @@ function SettingsAccountCard({account}: {account: SessionAccount}) {
 type Props = NativeStackScreenProps<CommonNavigatorParams, 'Settings'>
 export function SettingsScreen({}: Props) {
   const queryClient = useQueryClient()
-  const colorMode = useColorMode()
-  const setColorMode = useSetColorMode()
+  const {colorMode, darkTheme} = useThemePrefs()
+  const {setColorMode, setDarkTheme} = useSetThemePrefs()
   const pal = usePalette('default')
   const {_} = useLingui()
   const setMinimalShellMode = useSetMinimalShellMode()
@@ -483,8 +483,36 @@ export function SettingsScreen({}: Props) {
             />
           </View>
         </View>
+
         <View style={styles.spacer20} />
 
+        {colorMode !== 'light' && (
+          <>
+            <Text type="xl-bold" style={[pal.text, styles.heading]}>
+              <Trans>Dark Theme</Trans>
+            </Text>
+            <View>
+              <View style={[styles.linkCard, pal.view, styles.selectableBtns]}>
+                <SelectableBtn
+                  selected={!darkTheme || darkTheme === 'dim'}
+                  label={_(msg`Dim`)}
+                  left
+                  onSelect={() => setDarkTheme('dim')}
+                  accessibilityHint={_(msg`Set dark theme to the dim theme`)}
+                />
+                <SelectableBtn
+                  selected={darkTheme === 'dark'}
+                  label={_(msg`Dark`)}
+                  right
+                  onSelect={() => setDarkTheme('dark')}
+                  accessibilityHint={_(msg`Set dark theme to the dark theme`)}
+                />
+              </View>
+            </View>
+            <View style={styles.spacer20} />
+          </>
+        )}
+
         <Text type="xl-bold" style={[pal.text, styles.heading]}>
           <Trans>Basics</Trans>
         </Text>