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

* Add platform vars to env

* Replace /platform/detection with /env

src/components/dialogs/BirthDateSettings.tsx

@@ -7,7 +7,6 @@ import {useCleanError} from '#/lib/hooks/useCleanError'
 import {isAppPassword} from '#/lib/jwt'
 import {getAge, getDateAgo} from '#/lib/strings/time'
 import {logger} from '#/logger'
-import {isIOS, isWeb} from '#/platform/detection'
 import {
   useBirthdateMutation,
   useIsBirthdateUpdateAllowed,
@@ -26,6 +25,7 @@ import {DateField} from '#/components/forms/DateField'
 import {SimpleInlineLinkText} from '#/components/Link'
 import {Loader} from '#/components/Loader'
 import {Span, Text} from '#/components/Typography'
+import {IS_IOS, IS_WEB} from '#/env'
 
 export function BirthDateSettingsDialog({
   control,
@@ -154,7 +154,7 @@ function BirthdayInner({
 
   return (
     <View style={a.gap_lg} testID="birthDateSettingsDialog">
-      <View style={isIOS && [a.w_full, a.align_center]}>
+      <View style={IS_IOS && [a.w_full, a.align_center]}>
         <DateField
           testID="birthdayInput"
           value={date}
@@ -191,7 +191,7 @@ function BirthdayInner({
         <ErrorMessage message={errorMessage} style={[a.rounded_sm]} />
       ) : undefined}
 
-      <View style={isWeb && [a.flex_row, a.justify_end]}>
+      <View style={IS_WEB && [a.flex_row, a.justify_end]}>
         <Button
           label={hasChanged ? _(msg`Save birthdate`) : _(msg`Done`)}
           size="large"