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

* Add platform vars to env

* Replace /platform/detection with /env

src/view/shell/createNativeStackNavigatorWithAuth.tsx

@@ -27,7 +27,6 @@ import {
 
 import {PWI_ENABLED} from '#/lib/build-flags'
 import {useWebMediaQueries} from '#/lib/hooks/useWebMediaQueries'
-import {isNative, isWeb} from '#/platform/detection'
 import {useSession} from '#/state/session'
 import {useOnboardingState} from '#/state/shell'
 import {
@@ -39,6 +38,7 @@ import {Onboarding} from '#/screens/Onboarding'
 import {SignupQueued} from '#/screens/SignupQueued'
 import {atoms as a, useLayoutBreakpoints} from '#/alf'
 import {PolicyUpdateOverlay} from '#/components/PolicyUpdateOverlay'
+import {IS_NATIVE, IS_WEB} from '#/env'
 import {BottomBarWeb} from './bottom-bar/BottomBarWeb'
 import {DesktopLeftNav} from './desktop/LeftNav'
 import {DesktopRightNav} from './desktop/RightNav'
@@ -115,7 +115,7 @@ function NativeStackNavigator({
   const {setShowLoggedOut} = useLoggedOutViewControls()
   const {isMobile} = useWebMediaQueries()
   const {leftNavMinimal} = useLayoutBreakpoints()
-  if (!hasSession && (!PWI_ENABLED || activeRouteRequiresAuth || isNative)) {
+  if (!hasSession && (!PWI_ENABLED || activeRouteRequiresAuth || IS_NATIVE)) {
     return <LoggedOut />
   }
   if (hasSession && currentAccount?.signupQueued) {
@@ -158,7 +158,7 @@ function NativeStackNavigator({
           describe={describe}
         />
       </View>
-      {isWeb && (
+      {IS_WEB && (
         <>
           {showBottomBar ? <BottomBarWeb /> : <DesktopLeftNav />}
           {!isMobile && <DesktopRightNav routeName={activeRoute.name} />}