- Consolidated `recharts` imports for `BarChart`, `AreaChart`, and `LineChart` components.
- Reformatted inline styles for tooltips and axis elements to enhance readability and maintain consistency.
- Applied minor cleanups for improved project code styling.
- Introduced `RegistrationActivityChart` to display user registration trends over 14 days.
- Enhanced `AdminStatsResponse` with `registration_activity`, providing improved insights for admin users.
- Updated demo data to include realistic registration activity and organization details.
- Refactored admin page to use updated statistics data model and improved query handling.
- Fixed inconsistent timezone handling in statistical analytics and demo user timestamps.
