Genre/year/tag filters lived in global atoms with no per-library memory and
no reset on library switch, so a selection in one library (e.g. Anime) bled
into another (e.g. Shows). Sort/order/filterBy were already per-library but
persisted across app restarts.
Move all per-library filter state to in-memory preferences — genres/years/tags
get their own, and sort/order/filterBy stop using atomWithStorage: each library
remembers its own filters for the session and everything resets when the app is
fully closed. The library mount effect restores the active library's selection,
the shared useFilterReset clears it, and collections open with a clean slate.
Also fix the grid not returning to the top on a filter/sort change or reset:
it now pins to the top instantly and re-pins once the filtered fetch settles
(FlashList was restoring the previous offset as the new content grew);
pagination is left untouched.
The hook returned a fresh array on every render (and console.logged
it). The unstable identity cascaded into list-header re-creation and,
under heavy re-rendering, tripped React maximum-update-depth.
