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Obvious first feature would be real time chat, this could be nicely done with Go with the help of something like Gorilla Websockets
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Second feature would be to add native like gesture controls for replying and adding actions to message bubbles, these can be done in vanilla React with useRef and event tricks
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Send audio message, since the Muzz mobile app has this feature it could be added on the web version too, since the browser has a meadia stream api
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Extending the image send feature to support video file types and html
<video>tag could display the video within the chat interface -
Finally live calls could be possible to implement on the Web app too via a protocol like WebRTC so users could do live video calls from the browser