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.
Add Queue (list.bullet), More (VideoContextMenuView ellipsis), and Play
Previous buttons to the macOS control bar. Play Previous is shown always and
disabled when the queue has no previous item. Remove the skip-back/forward 10s
buttons and the fullscreen button from the bar (arrow-key seek and F-key
fullscreen shortcuts are retained).
Queue reuses the existing cross-platform queue sheet; More reuses the shared
VideoContextMenuView (already !os(tvOS)), styled borderless to match the flat
bar buttons.
Reset isCommentsExpanded and commentsFrame on the NavigationCoordinator
directly when the portrait panel is dismissed, since PortraitDetailsPanel
owns its own @State that doesn't sync back through .onChange during dismiss.
Also track comments overlay frame via GeometryReader so the dismiss gesture
can allow swipes outside the comments area instead of blanket-blocking.
