The standalone channel page had sort/filter/search; the merge into show-detail
dropped them. Now that the whole catalog is client-side, they're instant:
- A controls row above the year pills: a debounced title search + a sort select
(Newest / Oldest / Most viewed / Longest).
- Newest/Oldest keep the year-season grouping (reordered); search + Most-viewed +
Longest collapse into one flat sorted 'results' list. Empty search → a clear
'No videos match …' state.
- Refactored ytToShow's grouping into reusable helpers (ytGroupByYear / ytEpisodeOf)
+ ytRegroup(), which the streaming loop now uses too — so newly-streamed videos
fold into whatever view/sort is active, and the master list stays intact.
Search focus is preserved across the regroup (same hack the music manager uses).
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