Introduce `_relocate_theme_file` to handle moving files to theme-specific directories in the storage system. This ensures better organization of uploaded files by associating them with a theme ID and file type, improving maintainability and structure.
Introduced new fixtures and tests for storage functionality, including saving files, generating URLs, and token creation/verification. Refactored `get_storage_provider` into a separate dependency module. Enhanced test coverage for improved reliability.
Renamed `base_dir` to `upload_folder` for better clarity and alignment with its purpose. Adjusted references and settings variable to reflect the updated naming convention. This enhances code readability and consistency.
