- Server collects distinct genres and statuses from all cached items and
passes them as AllGenres/AllStatuses slices to the template
- Facet chips rendered as pill toggles below the text search bar
- Cards gain data-status, data-genres (pipe-delimited), data-local attributes
- JS filter engine: AND between facets, OR within status facet (a book has
one status), AND within genre facet (all selected genres must be present)
- Pagination row hidden while any filter is active; restored on clear
- 'Clear filters' button appears when any filter is active
- sortedKeys helper added to produce stable sorted facet chip order
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