Two Discover UX issues:
- Foreign-language titles leaked into the general genre/decade rails. Added an
original-language filter (with_original_language) through client.discover -> discover_filter
-> /discover/list (?lang=); the genre/decade/'because you like' rails now pin lang=en, and a
handful of dedicated foreign rails (Korean/Japanese/Spanish/French/Hindi) house non-English.
- 'Hide owned' + a huge library = nearly-empty rails (a 2-page batch was mostly owned, then
CSS-hidden to almost nothing). /discover/list now takes hide_owned=1: it drops owned
server-side and pages DEEPER (up to 8) until a rail has ~24 un-owned. fillShelf passes
hide_owned when the toggle's on; toggling re-renders the rails (+ personalized rows) instead
of just CSS-hiding cards.
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