- Segmented controls (Kind/Sort) now have a highlight 'thumb' that springs
between options (JS measures the active button → CSS var slide); repositions
on click, page-show, and resize.
- Chips: brighter active gradient with a glow ring + subtle lift, smoother hover.
- No-TMDB empty state: genres are a static TMDB endpoint, so when they come back
empty the page shows a 'Discover needs TMDB' card instead of a bare shell.
- Persist 'Hide owned' across sessions (localStorage); async image decoding on
cards.
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