Improve design of chat input

[xPaw]

Currently the input is a simple underline with the smile button next to, so the underline doesn't span under it.

With some minor changes this could be improved, maybe with some design cues from material 3 like the rest of the app.

A rounded container with a slightly different background and the emotes button inside would look reasonable if good margins are applied.

[Cubillas7]

As additional feature or improvement add some advertisement when you enter to the channel and you have a timeout and you cannot write on the channel, something like on the original one. Thanks!