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

* Add platform vars to env

* Replace /platform/detection with /env

src/components/PostControls/ShareMenu/ShareMenuItems.tsx

@@ -10,7 +10,6 @@ import {type NavigationProp} from '#/lib/routes/types'
 import {shareText, shareUrl} from '#/lib/sharing'
 import {toShareUrl} from '#/lib/strings/url-helpers'
 import {logger} from '#/logger'
-import {isIOS} from '#/platform/detection'
 import {useProfileShadow} from '#/state/cache/profile-shadow'
 import {useSession} from '#/state/session'
 import * as Toast from '#/view/com/util/Toast'
@@ -24,6 +23,7 @@ import {Clipboard_Stroke2_Corner2_Rounded as ClipboardIcon} from '#/components/i
 import {PaperPlane_Stroke2_Corner0_Rounded as PaperPlaneIcon} from '#/components/icons/PaperPlane'
 import * as Menu from '#/components/Menu'
 import {useAgeAssurance} from '#/ageAssurance'
+import {IS_IOS} from '#/env'
 import {useDevMode} from '#/storage/hooks/dev-mode'
 import {RecentChats} from './RecentChats'
 import {type ShareMenuItemsProps} from './ShareMenuItems.types'
@@ -63,7 +63,7 @@ let ShareMenuItems = ({
   const onCopyLink = async () => {
     logger.metric('share:press:copyLink', {}, {statsig: true})
     const url = toShareUrl(href)
-    if (isIOS) {
+    if (IS_IOS) {
       // iOS only
       await ExpoClipboard.setUrlAsync(url)
     } else {