Refactor PatternManager and SampleManagementProvider for improved icon usage and user pack loading logic

Commit notes

This commit updates the PatternManager component to replace icon imports with their corresponding icon variants for better clarity and consistency. Additionally, it enhances the SampleManagementProvider by implementing owner-only checks for loading user packs, ensuring that only authorized users can access their sample packs. The use of environment variables for owner email validation is also introduced, improving security and maintainability.