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

* Add platform vars to env

* Replace /platform/detection with /env

src/view/com/composer/threadgate/ThreadgateBtn.tsx

@@ -8,7 +8,6 @@ import deepEqual from 'fast-deep-equal'
 
 import {isNetworkError} from '#/lib/strings/errors'
 import {logger} from '#/logger'
-import {isNative} from '#/platform/detection'
 import {usePostInteractionSettingsMutation} from '#/state/queries/post-interaction-settings'
 import {createPostgateRecord} from '#/state/queries/postgate/util'
 import {usePreferencesQuery} from '#/state/queries/preferences'
@@ -25,6 +24,7 @@ import {Earth_Stroke2_Corner0_Rounded as EarthIcon} from '#/components/icons/Glo
 import {Group3_Stroke2_Corner0_Rounded as GroupIcon} from '#/components/icons/Group'
 import * as Tooltip from '#/components/Tooltip'
 import {Text} from '#/components/Typography'
+import {IS_NATIVE} from '#/env'
 import {useThreadgateNudged} from '#/storage/hooks/threadgate-nudged'
 
 export function ThreadgateBtn({
@@ -70,7 +70,7 @@ export function ThreadgateBtn({
       nudged: tooltipWasShown,
     })
 
-    if (isNative && Keyboard.isVisible()) {
+    if (IS_NATIVE && Keyboard.isVisible()) {
       Keyboard.dismiss()
     }