Arrow-seek on the focused scrubber previously moved the handle but
showed no storyboard/chapter context. Reuse the existing SELECT-scrub
overlay for arrow-seek too, with a ~2s lingering fade after the last
press so the preview doesn't vanish the instant the seek commits.
Pressing Menu while scrubbing now discards the pending scrub and leaves
playback time unchanged, instead of committing the seek via the
focus-loss path.
tvOS rasterizes Siri Remote touchpad swipes into discrete onMoveCommand
events at ~300-400ms, so a fast swipe and a single tap delivered the
same fixed step. Track gap between events: rapid same-direction events
(under 500ms) build a streak that multiplies the step via a power curve,
while deliberate taps still land on the base step.
Pressing left/right on the focused progress bar now triggers the same
accumulating 10s seek as the hidden-controls flow, but updates the
visible scrubber in place with no overlay. Both tvOS arrow-seek paths
accumulate a signed net offset so a reverse press subtracts from the
pending amount instead of restarting from the current playback time.
Extract shared TimeInterval.formattedAsTimestamp replacing 8 identical
formatTime/formattedTime implementations across player views. Remove
unused currentTime parameter from GestureSeekPreviewView. Consolidate
duplicated geometry math in MacOSControlBar into seekPreviewPosition().
