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

* Add platform vars to env

* Replace /platform/detection with /env

src/alf/typography.tsx

@@ -4,9 +4,9 @@ import {type StyleProp, type TextStyle} from 'react-native'
 import {UITextView} from 'react-native-uitextview'
 import createEmojiRegex from 'emoji-regex'
 
-import {isNative} from '#/platform/detection'
-import {isIOS} from '#/platform/detection'
 import {type Alf, applyFonts, atoms, flatten} from '#/alf'
+import {IS_NATIVE} from '#/env'
+import {IS_IOS} from '#/env'
 
 /**
  * Ensures that `lineHeight` defaults to a relative value of `1`, or applies
@@ -34,7 +34,7 @@ export function normalizeTextStyles(
     if (s.lineHeight !== 0 && s.lineHeight <= 2) {
       s.lineHeight = Math.round(s.fontSize * s.lineHeight)
     }
-  } else if (!isNative) {
+  } else if (!IS_NATIVE) {
     s.lineHeight = s.fontSize
   }
 
@@ -81,7 +81,7 @@ export function renderChildrenWithEmoji(
   props: Omit<TextProps, 'children'> = {},
   emoji: boolean,
 ) {
-  if (!isIOS || !emoji) {
+  if (!IS_IOS || !emoji) {
     return children
   }
   return Children.map(children, child => {