v0.6.0

Changes

• auto-generate release notes from feat/fix commits
• skip KF6IdleTime on jammy/noble, where it is not packaged
• install GL libraries for the AppImage row
• keep Arch repo when deploying Doxygen docs
• install macOS pre-last cask and mark AppImage executable
• check real OS autostart state and sync it with settings at startup
• save username and password fields when Start/Stop is clicked
• use Material style so the window follows the system light/dark theme
• highlight username and password fields red when the server rejects credentials
• make pre-commit and pre-push run on macOS