"Last seen " and "online status" #34
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The following code implements a "last seen" and "online status" feature for the provided chat application. It displays "Online" if the user is currently active, and the last seen time if they are not. The getLastSeen method formats the last seen time based on the current time and the difference. The home page lists chat summaries with name, message, time, online status, and last seen information. The onLastSeenUpdated callback updates the chat's last seen status and online status dynamically, providing a real-time user experience in the chat application.