docs: update changelog for 0.4.0

Author: damyanpetev

CHANGELOG.md

@@ -7,6 +7,29 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 > **Note:** This project is currently in initial development (0.0.x versions). Until version 1.0.0 is released, the public API is not considered stable and breaking changes may occur in any release without following semantic versioning conventions.
 
+## [Unreleased]
+
+
+## [0.4.0] - 2026-01-29
+
+### Added
+
+- Added `navigateTo(row, column?, activate?)` API for programmatic navigation/scrolling. [#27](https://github.com/IgniteUI/igniteui-grid-lite/pull/27)
+- Support for nested field paths (dot notation) in column `field` (e.g. `address.city`). [#28](https://github.com/IgniteUI/igniteui-grid-lite/pull/28)
+- Unified theming with latest `igniteui-webcomponents` implementation with support for scoped theme provider. [#36](https://github.com/IgniteUI/igniteui-grid-lite/pull/36)
+
+### Changed
+- Add defaults for generic type params on main types, making specifying those optional [#43](https://github.com/IgniteUI/igniteui-grid-lite/pull/43)
+
+### Fixed
+
+- Cell text ellipsis styling. [#24](https://github.com/IgniteUI/igniteui-grid-lite/pull/24)
+- Improve local cell detection logic [#40](https://github.com/IgniteUI/igniteui-grid-lite/pull/40)
+- Column `data-type` attribute name. [#33](https://github.com/IgniteUI/igniteui-grid-lite/pull/33)
+- Virtualizer layout measurement/rendering under scale transform. [#30](https://github.com/IgniteUI/igniteui-grid-lite/pull/30)
+- Declarative columns are now detected even when nested inside a wrapping element. [#35](https://github.com/IgniteUI/igniteui-grid-lite/pull/35)
+- Theming controller cleanup on disconnect. [#31](https://github.com/IgniteUI/igniteui-grid-lite/pull/31)
+
 ## [0.3.1] - 2025-12-12
 
 ### Changed