Implement AI suggestion functionality for pack metadata updates

Commit notes

- Enhanced the AIGenerationHandler to accept optional fields for title, description, and tags in the AI metadata generation request, improving flexibility for users. - Updated the frontend PackManager component to allow users to generate AI suggestions for individual fields (title, description, tags) with dedicated buttons, enhancing user experience. - Refactored APIClient to support new parameters for generating pack metadata, ensuring type safety with updated AIMetadataSuggestion interface. - Improved state management in StoryPackPage to handle draft values for name, description, and tags, facilitating smoother user interactions.