settings: Challenge can never ends

frontend/ui/src/lib/components/HeaderClock.svelte

@@ -8,7 +8,7 @@
  import { settings, time } from '$lib/stores/settings.js';
 </script>
 
-{#if $settings}
+{#if $settings && $settings.end}
     {#if $settings.end - $settings.start > 0}
         <div
             class="clock display-2 text-end text-md-center"
@@ -69,7 +69,7 @@
 {:else}
     <div class="d-flex h-100 justify-content-center align-items-center">
         <h1 class="display-3 m-0">
-            Challenge forensic
+            {$challengeInfo.title}
         </h1>
     </div>
 {/if}