docs: add CHANGELOG entry for export to clipboard

Author: datlechin

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - iOS: page-based pagination for data browser
 - iOS: filter bar with 16 operators, AND/OR logic
 - iOS: persistent query history with timestamps
+- iOS: export to clipboard (JSON, CSV, SQL INSERT)
 
 ## [0.27.4] - 2026-04-05