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

* Add platform vars to env

* Replace /platform/detection with /env

src/components/NewskieDialog.tsx

@@ -8,7 +8,6 @@ import {differenceInSeconds} from 'date-fns'
 import {HITSLOP_10} from '#/lib/constants'
 import {useGetTimeAgo} from '#/lib/hooks/useTimeAgo'
 import {sanitizeDisplayName} from '#/lib/strings/display-names'
-import {isNative} from '#/platform/detection'
 import {useModerationOpts} from '#/state/preferences/moderation-opts'
 import {useSession} from '#/state/session'
 import {atoms as a, useTheme, web} from '#/alf'
@@ -18,6 +17,7 @@ import {useDialogControl} from '#/components/Dialog'
 import {Newskie} from '#/components/icons/Newskie'
 import * as StarterPackCard from '#/components/StarterPack/StarterPackCard'
 import {Text} from '#/components/Typography'
+import {IS_NATIVE} from '#/env'
 
 export function NewskieDialog({
   profile,
@@ -162,7 +162,7 @@ function DialogInner({
           </StarterPackCard.Link>
         ) : null}
 
-        {isNative && (
+        {IS_NATIVE && (
           <Button
             label={_(msg`Close`)}
             color="secondary"