Creates a new HelpService instance.
The application context for determining current scope
The display service for toggling help UI
Retrieves help menu items for the current application scope.
Built on first use and kept until the language changes, so a reader who switches language sees the shortcut list in the new one the next time they open help.
Array of help menu items or empty array if no items for current scope
Toggles the visibility of the help menu interface.
Service for managing context-sensitive help menus across different application scopes.