Show a top row in the macOS player controls (like tvOS) with the channel
avatar, video title, author name, and a close button whenever controls are
visible.
- Offset the top row below the traffic lights in the floating window by
measuring the window buttons against the top bar (no effect in fullscreen,
the inline sheet, or the side panel where there is no overlap).
- Tapping the avatar/title/author toggles the floating details panel, mirroring
the iOS title/author control.
- Hide the controls immediately when the details panel opens instead of waiting
for the auto-hide timer.
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