Reflect the video below the hinge in the tabletop layout

The iPhone Duo tabletop layout mirrors every presented frame into the
lower half, blurred and fading out, like a screen standing on a glossy
table. The render view blits a quarter-resolution copy of the display
framebuffer into a ring of IOSurface-backed buffers (no Y flip, so the
surface is already mirrored) and hands it to a CALayer hosted by
MPVReflectionView; the simulator's software renderer feeds the same
layer a flipped CGImage. Off during PiP, for audio-only streams, and
via the new Playback → Foldable → "Reflection Below Video" setting.

Yattee/Views/Settings/PlaybackSettingsView.swift

@@ -23,6 +23,7 @@ struct PlaybackSettingsView: View {
                 QueueSection(settings: settings)
                 #if os(iOS)
                 OrientationSection(settings: settings)
+                FoldableSection(settings: settings)
                 #endif
             }
         }
@@ -362,6 +363,33 @@ private struct QueueSection: View {
     }
 }
 
+// MARK: - Foldable Section (iOS)
+
+#if os(iOS)
+/// iPhone Duo only: options for the tabletop (laptop-like) player layout.
+private struct FoldableSection: View {
+    @Bindable var settings: SettingsManager
+    @State private var hasHinge = HingeLayoutObserver.forceTabletop
+
+    var body: some View {
+        Group {
+            if hasHinge {
+                SettingsFormSection(
+                    "settings.playback.foldable.header",
+                    footer: "settings.playback.foldable.tabletopReflection.footer"
+                ) {
+                    Toggle(
+                        String(localized: "settings.playback.foldable.tabletopReflection"),
+                        isOn: $settings.tabletopReflection
+                    )
+                }
+            }
+        }
+        .observeHinge(hasHinge: $hasHinge)
+    }
+}
+#endif
+
 // MARK: - Orientation Section (iOS)
 
 #if os(iOS)