[FEATURE] long chat message

[Veraellyunjie]

Chat message length seems to be currently capped at 255 chars

255 chars is well below what one might want to put in a chat message

A message is a logical piece of conversation. It is sometimes desirable to put a long thought into a single message - not split across several messages - as it will visually stand as a single piece

Please raise the limit to e.g. several thousands chars