chore(gallery-web): update changelog

Author: samuelreichert

packages/pluggableWidgets/gallery-web/CHANGELOG.md

@@ -6,6 +6,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 
 ## [Unreleased]
 
+### Added
+
+- We implemented a new property to show a refresh indicator. With the refresh indicator, any datasource change shows a progress bar on top of Gallery.
+
 ## [3.2.0] - 2025-08-18
 
 ### Changed