Add notification support with enable/disable functionality and sound effects for new messages.

frontend/src/app/pages/altitude/chat/components/chat-info/chat-info.component.html

@@ -1,6 +1,13 @@
 <div class="full-width"
      [style.background-color]="getServerColor(selectedServer())">
-<span class="server" [style.color]="getServerTextColor(selectedServer())">
-  {{ selectedServer() }}
-</span>
+  <span class="server" [style.color]="getServerTextColor(selectedServer())">
+    {{ selectedServer() }}
+  </span>
+  <div class="notification-icon">
+    @if (notificationEnabled()) {
+      <svg-notification-enabled (click)="disableNotifications()"/>
+    } @else {
+      <svg-notification-disabled (click)="enableNotifications()"/>
+    }
+  </div>
 </div>