Update render to include user info.

src/snek/service/channel_message.py

@@ -51,7 +51,17 @@ class ChannelMessageService(BaseService):
         }
 
     async def save(self, model):
-        context = model.record  
+        context = {}
+        content.update(model.record)
+        user = await self.app.services.user.get(model['user_uid'])
+        context.update(
+            {
+                "user_uid": user["uid"],
+                "username": user["username"],
+                "user_nick": user["nick"],
+                "color": user["color"],
+            }
+        )
         template = self.app.jinja2_env.get_template("message.html")
         model["html"] = template.render(**context)
         return await super().save(model)