chore(release): update changelog for v3.9.1

Author: code-snippets-bot

CHANGELOG.md

@@ -1,5 +1,16 @@
 # Changelog
 
+
+## [3.9.1] (2025-11-14)
+
+### Changed
+* Migrated to native CSS direction handling (RTL/LTR) for improved compatibility and simpler styling
+* Updated dependencies to the latest compatible versions
+
+### Fixed
+* Fixed TinyMCE menu button registration to prevent initialization failure (see: https://wordpress.org/support/topic/failed-to-initialize-plugin-code_snippets/)
+* Fixed the position of the 'code direction' control in the editor
+
 ## [3.9.0] (2025-11-13)
 
 ### Added