[IMP] im_livechat : review channel history layout

The Live chat history was taking too much space and was hard to read.
The goal here is to display more information on the screen.
The pictures and padding are then reduced.

Note that kanban view is not a solution in long term.
At it does not allow to squash messages per user (if consecutive
messages from same user at close interval of time).
As the thread widget will be reviewed by discuss team in a
near future, we keep this at the moment and will integrate the
new thread widget later, mainly to be able to squash the messages.

Task ID : 1913869
Closes PR #30343

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