feat: Enhance pack generator with new index route and API integration

Commit notes

This commit introduces a new index route for the pack generator, allowing users to access the sample pack creation interface at the path '/pack-generator/'. It also integrates the Eden API for managing guest packs, including creating, uploading, and updating samples. Additionally, the previous API functions have been replaced with hooks for improved data handling and state management. The overall structure of the pack generator components has been refined for better user experience and maintainability.