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

* Add platform vars to env

* Replace /platform/detection with /env

src/screens/FindContactsFlowScreen.tsx

@@ -9,13 +9,13 @@ import {
   type AllNavigatorParams,
   type NativeStackScreenProps,
 } from '#/lib/routes/types'
-import {isNative} from '#/platform/detection'
 import {useSetMinimalShellMode} from '#/state/shell'
 import {ErrorScreen} from '#/view/com/util/error/ErrorScreen'
 import {FindContactsFlow} from '#/components/contacts/FindContactsFlow'
 import {useFindContactsFlowState} from '#/components/contacts/state'
 import * as Layout from '#/components/Layout'
 import {ScreenTransition} from '#/components/ScreenTransition'
+import {IS_NATIVE} from '#/env'
 
 type Props = NativeStackScreenProps<AllNavigatorParams, 'FindContactsFlow'>
 export function FindContactsFlowScreen({navigation}: Props) {
@@ -48,7 +48,7 @@ export function FindContactsFlowScreen({navigation}: Props) {
 
   return (
     <Layout.Screen>
-      {isNative ? (
+      {IS_NATIVE ? (
         <LayoutAnimationConfig skipEntering skipExiting>
           <ScreenTransition key={state.step} direction={transitionDirection}>
             <FindContactsFlow