New design for the @ mention pills

[DantrazTrev]

Is your suggestion related to a problem? Please describe.

The @ mention pills and the room reference look nearly identical to the room reference

There is only one visible distinction of a trailing : that is added if the mention is at the start and is removable.

Describe the solution you'd like.

A redesign for the @ pills that are a bit more distinguishable maybe remove the background and make it bolder?

Describe alternatives you've considered.

Not really sure about the designs so there should be better ones than the suggested