Add ARIA role=img with descriptive labels to world-map SVG and donut-chart SVG. Include a screen-reader-only data table in world-map for country/count pairs.
- Refactor stats handler to load_or_compute with cache fallback - Add donut charts for brewer and grinder usage (with XSS-safe labels) - Add bar charts for origins, flavours, grind weight, and brew time - Add consumption cards (total brewed, avg per brew, bags consumed) - Add roast summary section (top origins, processes, producers) - Register donut-chart.js static asset route - Add Recompute Stats button to admin page
