The hero dots/pause row was gated on live input mode, so any navigation
key event (Android back key, BT keyboards, gamepad-source noise) hid it
until the next pointer event - on phones it ended up permanently hidden.
Gate on the TV platform instead (issue #600's actual scope); the TV
layout never renders the carousel, so nothing changes there.
The bottom fade lost its guaranteed opaque band when the section-level
gradient was removed (686a61ac): the per-item overlay only reached full
background at the literal last pixel, letting artwork ghost through the
final 15% and read as a hard cut against the content below - worst on
phones, where square hero art is bright at the bottom. Finish the fade
at solid background from the 0.94 stop (~32px band on a phone hero).
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