Extract <chip-scroll> custom element into its own file and wrap
Recent Brews and Open Bags horizontal scrollers with desktop-only
chevron navigation that half-overlaps the card edges.
- New /stats page with Roasters, Roasts, Cups, and Cafes tabs
- Interactive choropleth world map (SVG) colored by country counts
- Clickable country chips that highlight individual countries on the map
- Horizontal chip scroller with chevron navigation on desktop
- Datastar-powered tab switching without page reload
- Domain layer: country name → ISO code mapping, flag emoji generation
- StatsRepository trait with four aggregate SQL queries
- <world-map> and <chip-scroll> custom elements for Datastar compatibility
