Fix iOS fullscreen gesture collision with notification center

In fullscreen playback, swipe-down and timeline seek gestures now respect a 60pt safe zone at the top of the screen, allowing the system notification center gesture to work without triggering app gestures.

Shared/Constants.swift

@@ -6,6 +6,7 @@ enum Constants {
     static let overlayAnimation = Animation.linear(duration: 0.2)
     static let aspectRatio16x9 = 16.0 / 9.0
     static let aspectRatio4x3 = 4.0 / 3.0
+    static let notificationCenterZoneHeight: Double = 60
 
     static var isAppleTV: Bool {
         #if os(iOS)

Shared/Player/Controls/TimelineView.swift

@@ -199,6 +199,16 @@ struct TimelineView: View {
             .gesture(
                 DragGesture(minimumDistance: 5, coordinateSpace: .global)
                     .onChanged { value in
+                        #if os(iOS)
+                            // In fullscreen, ignore gestures that start in the top notification center area
+                            // to allow system notification center gesture to work
+                            if player.playingFullScreen {
+                                if value.startLocation.y < Constants.notificationCenterZoneHeight {
+                                    return
+                                }
+                            }
+                        #endif
+
                         if !dragging {
                             controls.removeTimer()
                             draggedFrom = current

Shared/Player/PlayerDragGesture.swift

@@ -16,6 +16,16 @@ extension VideoPlayerView {
                 state = true
             }
             .onChanged { value in
+                #if os(iOS)
+                    // In fullscreen, ignore gestures that start in the top notification center area
+                    // to allow system notification center gesture to work
+                    if player.playingFullScreen {
+                        if value.startLocation.y < Constants.notificationCenterZoneHeight {
+                            return
+                        }
+                    }
+                #endif
+
                 guard player.presentingPlayer,
                       !controlsOverlayModel.presenting,
                       dragGestureState,