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

* Add platform vars to env

* Replace /platform/detection with /env

src/screens/VideoFeed/index.tsx

@@ -57,7 +57,6 @@ import {sanitizeDisplayName} from '#/lib/strings/display-names'
 import {cleanError} from '#/lib/strings/errors'
 import {sanitizeHandle} from '#/lib/strings/handles'
 import {logger} from '#/logger'
-import {isAndroid} from '#/platform/detection'
 import {useA11y} from '#/state/a11y'
 import {
   POST_TOMBSTONE,
@@ -101,6 +100,7 @@ import * as Hider from '#/components/moderation/Hider'
 import {PostControls} from '#/components/PostControls'
 import {RichText} from '#/components/RichText'
 import {Text} from '#/components/Typography'
+import {IS_ANDROID} from '#/env'
 import * as bsky from '#/types/bsky'
 import {Scrubber, VIDEO_PLAYER_BOTTOM_INSET} from './components/Scrubber'
 
@@ -590,10 +590,10 @@ function VideoItemInner({
   embed: AppBskyEmbedVideo.View
 }) {
   const {bottom} = useSafeAreaInsets()
-  const [isReady, setIsReady] = useState(!isAndroid)
+  const [isReady, setIsReady] = useState(!IS_ANDROID)
 
   useEventListener(player, 'timeUpdate', evt => {
-    if (isAndroid && !isReady && evt.currentTime >= 0.05) {
+    if (IS_ANDROID && !isReady && evt.currentTime >= 0.05) {
       setIsReady(true)
     }
   })
@@ -920,7 +920,7 @@ function Overlay({
           </LinearGradient>
         </View>
         {/*
-        {isAndroid && status === 'loading' && (
+        {IS_ANDROID && status === 'loading' && (
           <View
             style={[
               a.absolute,