feat: Add support for Slack reaction and message notifications

src/integrations/google-mail/listitem/GoogleMailNotificationListItem.tsx

@@ -2,12 +2,12 @@ import { GoogleMailThreadListItem } from "./GoogleMailThreadListItem";
 import { NotificationListItemProps } from "../../../notification";
 
 export function GoogleMailNotificationListItem({ notification, mutate }: NotificationListItemProps) {
-  if (notification.metadata.type !== "GoogleMail") return null;
+  if (notification.source_item.data.type !== "GoogleMailThread") return null;
 
   return (
     <GoogleMailThreadListItem
       notification={notification}
-      googleMailThread={notification.metadata.content}
+      googleMailThread={notification.source_item.data.content}
       mutate={mutate}
     />
   );