Support the iPhone Duo interior display in the player

The interior display refuses programmatic rotation
(UISceneErrorDomain 101: "The current windowing mode does not allow for
programmatic changes to interface orientation"), so the rotate/fullscreen
button did nothing there and the failure was swallowed.

- OrientationManager tracks `canRotateProgrammatically` (from the hinge
  state, cleared when a geometry request is refused) and is @Observable.
- The fullscreen button takes the iPad path when rotation is unavailable:
  details toggle in portrait, floating panel toggle in landscape, icon
  follows the panel state; orientation lock is hidden. The refused request
  itself falls back to the details toggle. Accelerometer-driven rotation
  requests are gated the same way.
- Corner layout gate is size-only on iOS (≥900×600 including safe areas,
  so the status bar toggling with the layout can't oscillate it); the
  layout-mode setting is exposed on foldables via a hinge presence check.
- Corner layout on iPhone always hides the status bar (the interior's
  landscape bar is a ~57pt column) and pads by the live top inset only,
  instead of the transient 82pt inset seen while unfolding.
- The player hosting controller nudges its safe area after size
  transitions so fold/unfold doesn't leave SwiftUI with stale insets.

Yattee/Views/Player/ExpandedPlayerWindow.swift

@@ -114,6 +114,22 @@ private final class ExpandedPlayerHostingController<Content: View>: UIHostingCon
             guard let window = self?.view.window,
                   let scene = window.windowScene else { return }
             window.frame = scene.coordinateSpace.bounds
+        }, completion: { [weak self] _ in
+            // Folding/unfolding the iPhone Duo (and display handoffs in
+            // general) changes the safe area without a rotation; SwiftUI
+            // keeps serving the previous insets to the sheet's GeometryReader
+            // until the hosting controller's safe area is invalidated. Nudge
+            // additionalSafeAreaInsets, the same trick the dismiss path uses
+            // for the main window.
+            guard let self else { return }
+            let originalInsets = self.additionalSafeAreaInsets
+            self.additionalSafeAreaInsets = UIEdgeInsets(
+                top: originalInsets.top + 1,
+                left: originalInsets.left,
+                bottom: originalInsets.bottom,
+                right: originalInsets.right
+            )
+            self.additionalSafeAreaInsets = originalInsets
         })
     }