- Add detail page routes, templates, and view models for roasters, cafes,
and gear, following the existing pattern from bags/brews/cups
- Add map_with_legend_1 macro for single-country detail maps
- Redirect to detail page after entity creation instead of list page
- Check referer in create handlers to return list fragment only from data page
- Update bag delete button to use red background style
- Update datastar tests to include referer header for create assertions
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