perf(web): reduce member profile roundtrips in chat info

web/src/chat/types.ts

@@ -46,6 +46,9 @@ export interface ChatMember {
   user_id: number;
   role: ChatMemberRole;
   joined_at: string;
+  username?: string | null;
+  name?: string | null;
+  avatar_url?: string | null;
 }
 
 export interface ChatBan {