chore: remove release dates from changelog entries

Author: programmersd21

CHANGELOG.md

@@ -5,7 +5,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [1.5.2] - 2026-05-06
+## [1.5.2]
 
 ### Added
 - Dashboard-style Empty State: Transformed the empty home screen into a modular 'Momentum Dashboard' with productivity velocity metrics and clean, bordered layout.
@@ -26,7 +26,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - UI Redundancy: Removed duplicate selection indicators in task list.
 - AI System Prompt: Enforced strict schema adherence for AI tool calls, enabling reliable persistence of all task attributes via natural language.
 
-## [1.5.1] - 2026-05-06
+## [1.5.1]
 
 ### Fixed
 - Due date time corruption bug: time was incorrectly overwritten by MM-dd being parsed as HH:mm