chore: update CHANGELOG for version 1.5.2 with mobile enhancements and UI/UX improvements

CHANGELOG.md

@@ -1,5 +1,25 @@
 # Changelog
 
+## 1.5.2 - 2025-12-31
+
+### Features
+
+- **Mobile Enhancements**:
+  - Added pinch-to-zoom support for graph navigation on touch devices.
+  - Redesigned mobile toolbar into a single row with a collapsible "More" menu.
+  - Added a responsive expand/collapse toggle for the mobile toolbar using chevron icons.
+  - Moved the "Add Node" action to a floating sticky button in the bottom-right on mobile for better accessibility.
+  - Optimized toolbar width and spacing for mobile screens.
+- **UI/UX**:
+  - Removed top navbar/header to maximize workspace area.
+  - Simplified layout with a minimal footer.
+  - Updated footer branding to include "Linking Tool".
+
+### Fixes
+
+- Improved click-outside handling for mobile menus.
+- Fixed various mobile layout and justification constraints.
+
 ## 1.5.1 - 2025-12-29
 
 ### Features
@@ -39,7 +59,6 @@
 - `vite`: ^7.2.6 -> ^7.3.0
 - Added `eslint-plugin-security`: ^3.0.1
 
-
 ### Major Codebase Changes
 
 - Moved from `npm` to `pnpm`