v3: fix chatbox scroll position on reply, small visual tweaks

src/components/ChatModal.tsx

@@ -391,7 +391,10 @@ export function ChatModal({ onClose }: { onClose: () => void }) {
       const node = listRef.current;
       if (node && stickToBottomRef.current) node.scrollTop = node.scrollHeight;
     });
-  }, [messages, typingOthers.length]);
+    // `replyTarget` is a dependency because the reply bar inserts itself
+    // between the list and the composer, shrinking the list: when pinned we
+    // must re-anchor to the bottom so the last message isn't hidden behind it.
+  }, [messages, typingOthers.length, replyTarget]);
 
   const handleScroll = useCallback(() => {
     const el = listRef.current;