feat: connect consecutive messages

[zeucapua]

If a user sends multiple messages in a row, it could make the page "messy" with repeating avatar and details UI alongside the messages.

I suggest we should render these differently, with just one avatar and details in the initial message, with the rest just showing the message itself appended. On hover, you can get the exact date it was sent, so that information doesn't get lost.

If the next message is still from the previous user and differ from the last by more than 3 (5?) minutes, it will break to a "new chain".

Currently