Display "BLOCKED" label for messages with notBlocked set to false in chat view.

frontend/src/app/pages/altitude/chat/chat.component.html

@@ -10,6 +10,10 @@
     <section class="darkmodeSection">
       @for (message of messages(); track message.timestamp) {
         <p>
+          @if (!message.notBlocked) {
+            [<span style="color: red">BLOCKED</span>]
+          }
+          [{{ message.server }}]
           <mini-message [node]="message.messageJson"></mini-message>
         </p>
       }