Posters and episode thumbnails looked noticeably soft on Fire TV sticks and
similar boxes: the auto-detected reduced tier capped artwork DPR at 1.5 and
tightened tile decode caps, so every tile was fetched at 56% of its pixels
and upscaled twice on large 4K panels.
Drop the reduced-tier DPR cap and the poster/square/thumb decode caps so
tiles fetch and decode at full TV density on every tier; raise the reduced
image-cache budget to the 64MB TV baseline to absorb the larger tiles.
Backdrops keep their scrim-masked ~720p reduced caps, and the display budget
factor stays pinned to 1.0 there, so the low-RAM art ceiling is unchanged.
close#2020
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