Add scroll queue detection in notification view

This will stop injecting events into the timeline if you're scrolling

damus/Views/Notifications/NotificationsView.swift

@@ -22,6 +22,12 @@ struct NotificationsView: View {
                         NotificationItemView(state: state, item: item)
                     }
                 }
+                .background(GeometryReader { proxy -> Color in
+                    DispatchQueue.main.async {
+                        handle_scroll_queue(proxy, queue: self.notifications)
+                    }
+                    return Color.clear
+                })
                 .padding(.horizontal)
             }
             .onReceive(handle_notify(.scroll_to_top)) { notif in