chore: update changelog for v0.2.6 release

Author: Hakanbaban53

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
-## [unreleased]
+## [v0.2.6] - 2026-05-19
 
 ### Added
 - Dry run toggle on Operation Control Panel for sync, bisync, copy and move operations.