docs: Updated CHANGELOG.md (#2200)

Author: rkaraivanov

CHANGELOG.md

@@ -4,6 +4,25 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+### Changed
+- #### AI-Assisted Development
+  - Updated and enhanced the library provided skills [#2189](https://github.com/IgniteUI/igniteui-webcomponents/pull/2189) [#2195](https://github.com/IgniteUI/igniteui-webcomponents/pull/2195)
+- #### Button group
+  - Themes colors alignment [#2182](https://github.com/IgniteUI/igniteui-webcomponents/pull/2182)
+- #### Circular progressbar
+  - Unified track color CSS variable between progress bars [#2185](https://github.com/IgniteUI/igniteui-webcomponents/pull/2185)
+- #### Chip
+  - Wrap content inside a new part container and update styles [#2190](https://github.com/IgniteUI/igniteui-webcomponents/pull/2190)
+
+### Fixed
+- #### Dropdown
+  - Selected item styles [#2168](https://github.com/IgniteUI/igniteui-webcomponents/pull/2168)
+- #### Linear progressbar
+  - Unified display size across platforms [#2184](https://github.com/IgniteUI/igniteui-webcomponents/pull/2184)
+- #### Tree
+  - Background style discrepancies [#2173](https://github.com/IgniteUI/igniteui-webcomponents/pull/2173)
+
 ## [7.1.1] - 2026-03-25
 ### Changed
 - #### Checkbox