Add bubbleImageMaxHeight and bubbleImageMinHeight (#5236)

* Add bubbleImageMaxHeight and bubbleImageMinHeight

* Update PR number

* Default bubbleImageMinHeight to 240px

* Update breaking change for bubbleImageMinHeight

* Add test for freestyle

* Fixed width but cropped height

* Fix tests

* Add aspect ratio to test images

* Add CSS variable name

Author: compulim

CHANGELOG.md

@@ -24,13 +24,18 @@ Notes: web developers are advised to use [`~` (tilde range)](https://github.com/
 
 ## [Unreleased]
 
+### Breaking changes
+
+-  `styleOptions.bubbleImageHeight` is being deprecated in favor of `styleOptions.bubbleImageMaxHeight` and `styleOptions.bubbleImageMinHeight`. The option will be removed on or after 2026-07-05
+
 ## [4.18.0] - 2024-07-10
 
 ### Added
 
 -  (Experimental) Added initial decorators support, in PR [#5205](https://github.com/microsoft/BotFramework-WebChat/pull/5205), by [@OEvgeny](https://github.com/OEvgeny)
    -  Introduced internal `botframework-webchat-api/decorator` import, in PR [#5205](https://github.com/microsoft/BotFramework-WebChat/pull/5205), by [@OEvgeny](https://github.com/OEvgeny)
    -  Added `DecoratorComposer` and `ActivityDecorator` to be used for decorating activity border, in PR [#5205](https://github.com/microsoft/BotFramework-WebChat/pull/5205), by [@OEvgeny](https://github.com/OEvgeny)
+-  Added `styleOptions.bubbleImageMaxHeight` and `styleOptions.bubbleImageMinHeight` for variable image height, in PR [#5236](https://github.com/microsoft/BotFramework-WebChat/pull/5236), by [@compulim](https://github.com/compulim)
 
 ### Fixed