Update CHANGELOG wording to 'crashes on system unlock'

Agent-Logs-Url: https://github.com/hovancik/stretchly/sessions/48309e8f-9a58-4b8d-a114-d27eca708a62

Co-authored-by: hovancik <4745859+hovancik@users.noreply.github.com>

Author: Copilot

CHANGELOG.md

@@ -6,7 +6,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 
 ## [Unreleased]
 ### Fixed
-- fix duplicate powerMonitor listeners accumulating on system resume or screen unlock
+- fix crashes on system unlock
 
 ## [1.21.0] - 2026-04-25
 ### Added