Fix web embed views

(cherry picked from commit 771d4ccf163085bfc8ed55439643c93914e515f3)
(cherry picked from commit 4661f49d0e1390c9714537e57baebe7fabc4e08a)

src/components/dms/MessageItemEmbed.tsx

@@ -2,6 +2,7 @@ import React from 'react'
 import {View} from 'react-native'
 import {AppBskyEmbedRecord} from '@atproto/api'
 
+import {isNative} from '#/platform/detection'
 import {PostEmbeds} from '#/view/com/util/post-embeds'
 import {atoms as a, useTheme} from '#/alf'
 
@@ -13,7 +14,8 @@ let MessageItemEmbed = ({
   const t = useTheme()
 
   return (
-    <View style={[a.my_xs, t.atoms.bg, a.rounded_md, {flexBasis: 0}]}>
+    <View
+      style={[a.my_xs, t.atoms.bg, a.rounded_md, isNative && {flexBasis: 0}]}>
       <PostEmbeds embed={embed} />
     </View>
   )