DEV: htmlSafe timeline topic title (#19320)

app/assets/javascripts/discourse/app/components/topic-timeline/container.hbs

@@ -1,7 +1,7 @@
 {{#if @fullscreen}}
   <div class="title">
     <h2>
-      <a class="fancy-title" href {{on "click" @jumpTop}}>{{if @mobileView @model.fancyTitle ""}}</a>
+      <a class="fancy-title" href {{on "click" @jumpTop}}>{{this.topicTitle}}</a>
     </h2>
     {{#if (or this.siteSettings.topic_featured_link_enabled this.showTags)}}
       <div class="topic-header-extra">

app/assets/javascripts/discourse/app/components/topic-timeline/container.js

@@ -58,6 +58,10 @@ export default class TopicTimelineScrollArea extends Component {
     this.calculatePosition();
   }
 
+  get topicTitle() {
+    return htmlSafe(this.args.mobileView ? this.args.model.fancyTitle : "");
+  }
+
   get showTags() {
     return (
       this.siteSettings.tagging_enabled && this.args.model.tags?.length > 0