Fix player dismiss gesture stuck after panel dismiss with comments expanded

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.

Yattee/Views/Player/ExpandedPlayerSheet+VideoInfo.swift

@@ -31,6 +31,7 @@ extension ExpandedPlayerSheet {
 
     /// Collapses the comments overlay.
     func collapseComments() {
+        navigationCoordinator?.commentsFrame = .zero
         // Use same animation as player sheet dismiss (0.3s, no bounce)
         withAnimation(.smooth(duration: 0.3)) {
             isCommentsExpanded = false