Deep link to iOS Settings from Notifications prefs

Tusker/Screens/Preferences/Notifications/NotificationsPrefsView.swift

@@ -24,6 +24,24 @@ struct NotificationsPrefsView: View {
                 }
             }
             .appGroupedListRowBackground()
+            
+            if #available(iOS 15.4, *) {
+                Section {
+                    Button {
+                        let str = if #available(iOS 16.0, *) {
+                            UIApplication.openNotificationSettingsURLString
+                        } else {
+                            UIApplicationOpenNotificationSettingsURLString
+                        }
+                        if let url = URL(string: str) {
+                            UIApplication.shared.open(url)
+                        }
+                    } label: {
+                        Text("Open Notification Settings…")
+                    }
+                }
+                .appGroupedListRowBackground()
+            }
         }
         .listStyle(.insetGrouped)
         .appGroupedListBackground(container: PreferencesNavigationController.self)