Previously, toggling the system tray in the settings updated the configuration but did not instantiate or destroy the tray immediately. This caused a desynchronization bug where the application could minimize to a non-existent tray, creating a ghost instance.
The `set-feature` IPC handler now intercepts the `systemTray` key to apply the state at runtime before persisting the config.
- Add JSDoc comments across frontend and backend modules
- Improve code readability and maintainability with consistent documentation style
- Document Electron IPC handlers, UI utilities, and theme system
- Add missing function/class documentation in theme loader and app services
- Minor structural improvements and cleanup across Electron main process modules
- Minor fixes on variable names
