docs: add UI screenshots and logging section

CHANGELOG.md

@@ -4,36 +4,62 @@ All notable changes to this project will be documented in this file.
 
 ---
 
+## [0.4.0] - 2026-03-18
+
+### Added
+
+* Structured logging system with timestamps
+* Log levels: INFO, OK, ERR
+* Central log file: `/opt/update-manager/log/update-manager.log`
+* Log submenu in UI
+* Log viewing options:
+
+  * Full log
+  * Live log (tail -f)
+  * Last 20 lines
+  * Log file location
+
+### Changed
+
+* Refactored UI to group log features into submenu
+* Improved menu structure and usability
+
+### Improved
+
+* Better error visibility for SSH failures
+* Consistent output across hosts
+* README updated with UI screenshots and logging documentation
+
+---
+
 ## [0.3.0] - 2026-03-18
 
 ### Added
-- CLI menu (`update-manager-ui.sh`)
-- Interactive host selection
-- Basic UI navigation with dialog
+
+* CLI menu (`update-manager-ui.sh`)
+* Interactive host management
+* Dialog-based UI navigation
 
 ### Changed
-- Project renamed from lanx-update → update-manager
-- Improved structure in /opt/update-manager
 
-### Fixed
-- Symlink issues in setup
-- Path handling for config and hosts
+* Project renamed from `lanx-update` to `update-manager`
+* Moved runtime files to `/opt/update-manager`
 
 ---
 
 ## [0.2.0] - 2026-03-18
 
 ### Added
-- SSH-based update check across hosts
-- hosts.conf support
-- Config file support (`/etc/update-manager.conf`)
+
+* SSH-based update checking across multiple hosts
+* Support for `hosts.conf`
+* Config file support (`/etc/update-manager.conf`)
 
 ---
 
 ## [0.1.0] - 2026-03-17
 
 ### Added
-- Initial script
-- Basic apt update check
-
 
+* Initial version
+* Basic apt update check functionality