Memoize the per-image SHA-1 disk-cache key (ran on the UI thread on
every image build), fade images in via paint alpha instead of an
AnimatedSwitcher saveLayer per in-flight tile, create SettingsBuilder's
merged listenable once instead of per build, and drop the pointer
chrome (InkWell ink machinery, cursor MouseRegions) from cards on TV
where no pointer exists.
Poster images are decorative (the card exposes one merged node), and
the default per-child AutomaticKeepAlive/_SelectionKeepAlive/
IndexedSemantics wrappers are inert here — no keep-alive clients or
SelectionArea exist. The semantics phase ran ~9ms every frame on TV
devices with an accessibility service; it scales with node count.
edde746