update changelog

Author: haschek

CHANGELOG.md

@@ -12,6 +12,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
     -   displays single chat contents in a bubble, including options to add status line and avatar
 -   `<ChatField />`
     -   let the user input texts, calls `onSubmit` handler on enter key and submit button
+-   `<ChatArea />`
+    -   combine a list of chat contents and user input box
 
 ## [24.4.1] - 2025-08-25