feat(profile): add import/export and refiner model selection
Implement import and export functionality for all user-generated content, including profiles, custom icons, and AI refiner prompts. This feature is accessible via new commands in the script menu.
The import process is designed for backward compatibility, supporting both the new comprehensive data structure and the legacy profile-only array format.
Additionally, a model selection dropdown has been added to the AI refiner UI and the main settings panel. This allows users to choose which LLM to use for prompt refinement, and the selection is saved and synchronized between both locations.