- Introduced `StatDonut` and `WorldHeatmap` components for improved data visualization.
- Enhanced API to provide full country lists instead of a top-N subset for accurate map shading.
- Removed hardcoded country truncation logic in favor of dynamic slicing in the frontend.
- Updated age grouping logic to consolidate older age ranges and simplify backend queries.
- Refactored stats page layout to reduce redundancy and improve clarity of data presentation.
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