add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## [0.4.0] - Basil (2026-03-18)
+
+### Added
+
+- Vault management: create, rename, delete vaults
+- Last active vault persistence: remembers which vault was open
+- Plugin trust preservation: keeps plugin trust status when renaming vaults
+
+### Changed
+
+- Refactored vault operations into shared service
+
+### Fixed
+
+- Issues with dialogs and vault rename operations
+
+---
+
+_Changelog tracking started at version 0.4.0. For earlier versions, please refer to commit history._