The skip badge doubled as an armed state: while it was up, any single tap
in the same-direction zone seeked again. The badge is also raised by
keyboard, D-pad, media-transport and live seeks, so one remote press armed
one-tap seeking on the touch surface with no double tap at all. It stayed
armed for 1200 ms plus the fade and renewed on every tap, leaving the side
zones - 35% of the width each, over 70% of the height - unable to raise
the chrome.
Pair taps off the pending single-tap timer rather than differencing
DateTime.now(). The window is then one deadline that a clock adjustment
cannot stretch, suppressing touch taps disarms a half-finished pair, and
_lastSkipTapTime belongs to the desktop double-click paths alone.
Consecutive completed skips still accumulate into one running badge total.
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