Add changelog entry for snapshot reporting

Author: AKuederle

CHANGELOG.md

@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/) (+ the Migration Guide),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixed
+
+- Improved snapshot test mismatch reporting to include the snapshot file path and detailed comparator output for
+  DataFrame, NumPy array, and string snapshot failures.
+
 ## [2.2.0] - 2026-03-09
 
 ### Added