Add winforms activity indicator to news (#680)

Author: johnzhou721

content/news/buzz/june-2025-status-update/contents.lr

@@ -17,7 +17,8 @@ June has been a busy month, with some big improvements to BeeWare's websites and
 - We've started the process of [upgrading Briefcase to use a newer version of WiX for Windows MSI packaging](https://github.com/beeware/briefcase/pull/2355).
 - We added a [Slider widget to the Web backend](https://github.com/beeware/toga/pull/3527).
 - We added a DateInput widget to the [iOS](https://github.com/beeware/toga/pull/3483) and [macOS](https://github.com/beeware/toga/pull/3574) backends.
-- We added a TimeInput widget to the [iOS](https://github.com/beeware/toga/pull/3536) and [macOS](https://github.com/beeware/toga/pull/3574) backends. 
+- We added a TimeInput widget to the [iOS](https://github.com/beeware/toga/pull/3536) and [macOS](https://github.com/beeware/toga/pull/3574) backends.
+- We added an [ActivityIndicator widget to the WinForms backend](https://github.com/beeware/toga/pull/3473).
 - We modified the handling of Toga app paths so that [requesting a path guarantees that it exists](https://github.com/beeware/toga/pull/3543). This is a significant improvement to user experience, as it's no longer necessary to "check and create" every time you access an app path.
 - We resolved a long-standing instability in the macOS and iOS testbed app that [caused intermittent failures in the WebView tests](https://github.com/beeware/toga/pull/3557)
 - We added a new [topic guide on managing file system access in Toga apps](https://github.com/beeware/toga/pull/3552).