- Introduced `get_profile_reference_values_current_snapshot` and `get_profile_reference_values_recent_snapshot` functions to retrieve current and recent reference values for profiles.
- Updated the placeholder resolver to include new placeholders for current and recent reference values.
- Added new API endpoints for fetching current and recent reference values snapshots.
- Enhanced the frontend API utility to support the new snapshot endpoints.
- Improved unit tests to validate the new data layer functions and their behavior.