Update documentation for v0.4.1 release

Added release notes for v0.4.1 (2026-01-30) documenting:
- Authentication fixes with updated gosn-v2 dependency
- Tag cloud improvements with offline support
- Enhanced network error handling
- Tag reference matching fixes

Also documented v0.4.0 features including backup/restore,
enhanced export, tag cloud visualization, and templates.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: jonhadfield

CHANGELOG.md

@@ -4,6 +4,32 @@ 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).
 
+## [0.4.1] - 2026-01-30
+
+### Fixed
+- Authentication issues by updating gosn-v2 dependency to fix cookie-based auth
+- Tag cloud to properly use Tag→Note references instead of Note→Tag
+- Tag cloud to work completely offline using cached data
+- Network error handling in tag cloud with graceful degradation
+- Tag reference matching and display issues
+
+### Improved
+- Tag cloud now supports offline operation with cached items
+- Enhanced debugging for note reference detection
+- Better error messages for network failures
+
+## [0.4.0] - 2026-01-29
+
+### Added
+- Backup and restore functionality with optional encryption
+- Enhanced export with multiple format support (Markdown, HTML, static site)
+- Tag cloud visualization for exploring note relationships
+- Note templates system for quick note creation
+- Visual improvements with better progress indicators
+
+### Changed
+- Updated authentication to use cache.GetSession for better session management
+
 ## [0.3.5] - 2024-01-08
 
 ### Fixed

README.md

@@ -88,13 +88,17 @@ sn --use-session get notes
 
 ## 🆕 Recent Updates
 
-### Version 0.3.5 (2024-01-08)
-- 🐛 **Fixed**: Conflict warning handling
-- ✅ **Added**: Helper tests
-- 🔧 **Improved**: Code simplification
-
-### Version 0.3.4 (2024-01-07)
-- 🐛 **Fixed**: Command completion and updated instructions
+### Version 0.4.1 (2026-01-30)
+- 🔐 **Fixed**: Authentication issues with updated dependencies
+- 🏷️ **Improved**: Tag cloud visualization with offline support
+- 🛡️ **Enhanced**: Network error handling and graceful degradation
+- 🐛 **Fixed**: Tag reference matching and display issues
+
+### Version 0.4.0 (2026-01-29)
+- 💾 **Added**: Backup and restore functionality
+- 📤 **Added**: Enhanced export with multiple formats
+- 🎨 **Added**: Tag cloud visualization
+- 📝 **Added**: Note templates system
 
 **[View full changelog →](CHANGELOG.md)**