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

* Add platform vars to env

* Replace /platform/detection with /env

src/components/WhoCanReply.tsx

@@ -18,7 +18,6 @@ import {useLingui} from '@lingui/react'
 import {HITSLOP_10} from '#/lib/constants'
 import {makeListLink, makeProfileLink} from '#/lib/routes/links'
 import {logger} from '#/logger'
-import {isNative} from '#/platform/detection'
 import {
   type ThreadgateAllowUISetting,
   threadgateViewToAllowUISetting,
@@ -37,6 +36,7 @@ import {Earth_Stroke2_Corner0_Rounded as EarthIcon} from '#/components/icons/Glo
 import {Group3_Stroke2_Corner0_Rounded as GroupIcon} from '#/components/icons/Group'
 import {InlineLinkText} from '#/components/Link'
 import {Text} from '#/components/Typography'
+import {IS_NATIVE} from '#/env'
 import * as bsky from '#/types/bsky'
 
 interface WhoCanReplyProps {
@@ -86,7 +86,7 @@ export function WhoCanReply({post, isThreadAuthor, style}: WhoCanReplyProps) {
       : _(msg`Some people can reply`)
 
   const onPressOpen = () => {
-    if (isNative && Keyboard.isVisible()) {
+    if (IS_NATIVE && Keyboard.isVisible()) {
       Keyboard.dismiss()
     }
     if (isThreadAuthor) {
@@ -229,7 +229,7 @@ function WhoCanReplyDialog({
             embeddingDisabled={embeddingDisabled}
           />
         </View>
-        {isNative && (
+        {IS_NATIVE && (
           <Button
             label={_(msg`Close`)}
             onPress={() => control.close()}