- Removed the App_SetTheme IPC channel and related theme management code.
- Updated imports to use preferenceTypes for theme and selection action items.
- Refactored preference service to preload preferences and adjusted related components.
- Cleaned up unused code and comments related to theme management.
- Enhanced the organization of preference-related types and actions for better maintainability.
- Updated the preferences configuration to use `defaultActionItems` instead of an empty array for `feature.selection.action_items`, enhancing default behavior.
- Removed the `useSelectionAssistant` hook as it was no longer needed, streamlining the codebase.
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