Reduce <Text> nesting (#6615)

* Move isOnlyEmoji out of RichText

To fix Fast Refresh.

* Make renderChildrenWithEmoji work with any children

* Always go through UITextView for consistency

It already contains the `selectable` and `iOS` checks inside.

* Move `emoji` check into `renderChildrenWithEmoji`

* Remove unnecessary intermediate UITextView nodes

* Make childHasEmoji check recursive

It didn't handle nested arrays etc correctly before.

* Remove the "children must be string" limitation

Should not be necessary now that we correctly handle nested arrays etc.

* Fix unnecessary regex reallocation

This doesn't have a global flag so it's okay to reuse.

* Remove unnecessary <Text> wrapper in RichText

src/components/Typography.tsx

@@ -1,11 +1,9 @@
 import {UITextView} from 'react-native-uitextview'
 
 import {logger} from '#/logger'
-import {isIOS} from '#/platform/detection'
 import {atoms, flatten, useAlf, useTheme, web} from '#/alf'
 import {
   childHasEmoji,
-  childIsString,
   normalizeTextStyles,
   renderChildrenWithEmoji,
   TextProps,
@@ -39,10 +37,6 @@ export function Text({
         `Text: emoji detected but emoji not enabled: "${children}"\n\nPlease add <Text emoji />'`,
       )
     }
-
-    if (emoji && !childIsString(children)) {
-      logger.error('Text: when <Text emoji />, children can only be strings.')
-    }
   }
 
   const shared = {
@@ -55,7 +49,7 @@ export function Text({
 
   return (
     <UITextView {...shared}>
-      {isIOS && emoji ? renderChildrenWithEmoji(children, shared) : children}
+      {renderChildrenWithEmoji(children, shared, emoji ?? false)}
     </UITextView>
   )
 }