feat(ios): store notification payload in UserDefaults on tap

apps/ios/Runner/AppDelegate.swift

@@ -18,4 +18,18 @@ import UserNotifications
     }
     return super.application(application, didFinishLaunchingWithOptions: launchOptions)
   }
+
+  @available(iOS 10.0, *)
+  override func userNotificationCenter(
+    _ center: UNUserNotificationCenter,
+    didReceive response: UNNotificationResponse,
+    withCompletionHandler completionHandler: @escaping () -> Void
+  ) {
+    let userInfo = response.notification.request.content.userInfo
+    if let jsonData = try? JSONSerialization.data(withJSONObject: userInfo, options: []),
+       let jsonString = String(data: jsonData, encoding: .utf8) {
+      UserDefaults.standard.set(jsonString, forKey: "pending_notification_payload")
+    }
+    completionHandler()
+  }
 }