Show just-posted replies above OP replies (#4901)

* Unify onPostReply handler

* Show just-posted replies above OP replies

* Only do this for the highlighted post or thread mode

It's confusing to have your post displace OP thread or other people's leaf posts.

src/view/com/post-thread/PostThreadItem.tsx

@@ -75,7 +75,7 @@ export function PostThreadItem({
   showParentReplyLine?: boolean
   hasPrecedingItem: boolean
   overrideBlur: boolean
-  onPostReply: () => void
+  onPostReply: (postUri: string | undefined) => void
   hideTopBorder?: boolean
 }) {
   const postShadowed = usePostShadow(post)
@@ -169,7 +169,7 @@ let PostThreadItemLoaded = ({
   showParentReplyLine?: boolean
   hasPrecedingItem: boolean
   overrideBlur: boolean
-  onPostReply: () => void
+  onPostReply: (postUri: string | undefined) => void
   hideTopBorder?: boolean
 }): React.ReactNode => {
   const pal = usePalette('default')