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liveWindowFor hardcoded the selected *video* track, so audio-only live (no
video track / no selectedVideoTrackId) derived no window — leaving both
seek-to-live-edge and sync-live-seekable-range inert. Make liveWindowFor
track-type-agnostic (findTrackById instead of findTrack('video')), and add a
liveWindowFromState primitive that picks the timeline-bearing track:
selectedVideoTrackId ?? selectedAudioTrackId (video positions both A/V; audio-only
falls back to audio). Both behaviors now share that single call site, removing
the two brittle, must-stay-identical liveWindowFor(...) call sites.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>