iOS almost working

src/screens/Compose/Root/Header/PostingAs.tsx

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+import { getLocalAccount, getLocalUri } from '@utils/slices/instancesSlice'
+import { StyleConstants } from '@utils/styles/constants'
+import { useTheme } from '@utils/styles/ThemeManager'
+import React from 'react'
+import { useTranslation } from 'react-i18next'
+import { StyleSheet, Text } from 'react-native'
+import { useSelector } from 'react-redux'
+
+const ComposePostingAs = React.memo(
+  () => {
+    const { t } = useTranslation('sharedCompose')
+    const { theme } = useTheme()
+
+    const localAccount = useSelector(getLocalAccount)
+    const localUri = useSelector(getLocalUri)
+
+    return (
+      <Text style={[styles.text, { color: theme.secondary }]}>
+        {t('content.root.header.postingAs', {
+          acct: localAccount?.acct,
+          domain: localUri
+        })}
+      </Text>
+    )
+  },
+  () => true
+)
+
+const styles = StyleSheet.create({
+  text: {
+    ...StyleConstants.FontStyle.S
+  }
+})
+
+export default ComposePostingAs