Enha: state to hold room_id instead of whole room

components/room.html

@@ -1,6 +1,6 @@
 {{define "room"}}
 <div id="hello-user">
-  <p>Hello {{.Username}}</p>
+  <p>Hello {{.State.Username}}</p>
 </div>
 <hr />
 <div class="flex justify-center">
@@ -11,6 +11,6 @@
 </div>
 <hr />
 <div id="cardtable">
-  {{template "cardtable" .}}
+  {{template "cardtable" .Room}}
 </div>
 {{end}}