Move /platform/detection vars into /env (#9707)

* Add platform vars to env

* Replace /platform/detection with /env

src/view/com/util/layouts/LoggedOutLayout.tsx

@@ -5,8 +5,8 @@ import {useColorSchemeStyle} from '#/lib/hooks/useColorSchemeStyle'
 import {useIsKeyboardVisible} from '#/lib/hooks/useIsKeyboardVisible'
 import {usePalette} from '#/lib/hooks/usePalette'
 import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'
-import {isWeb} from '#/platform/detection'
 import {atoms as a} from '#/alf'
+import {IS_WEB} from '#/env'
 import {Text} from '../text/Text'
 
 export const LoggedOutLayout = ({
@@ -79,7 +79,7 @@ export const LoggedOutLayout = ({
             contentContainerStyle={styles.scrollViewContentContainer}
             keyboardShouldPersistTaps="handled"
             keyboardDismissMode="on-drag">
-            <View style={[styles.contentWrapper, isWeb && a.my_auto]}>
+            <View style={[styles.contentWrapper, IS_WEB && a.my_auto]}>
               {children}
             </View>
           </ScrollView>