Split the corner layout on the hinge when partially open

On a half-open foldable the side column takes exactly the trailing half,
so the split lands on the hinge. Fully open, the column can now be
resized up to half the width. A re-presented player seeds the hinge
state from the last report so it doesn't animate into the split.

Yattee/Views/Player/ExpandedPlayerSheet.swift

@@ -100,7 +100,9 @@ struct ExpandedPlayerSheet: View {
     /// Foldable hinge partially open (iPhone Duo laptop position): the
     /// fullscreen portrait layout keeps the video on the upper half and
     /// moves every control to the lower half.
-    @State var isTabletopHinge = false
+    /// Seeded from the last hinge report so a re-presented player starts in
+    /// the right layout instead of animating into it.
+    @State var isTabletopHinge = HingeLayoutObserver.lastKnownTabletop
     #endif
 
     #if os(iOS) || os(macOS)