replacing site-local error display by global error display

frontend/src/routes/wiki/GuestView.svelte

@@ -2,12 +2,11 @@
     import { onMount }       from 'svelte';
     import { useTinyRouter } from 'svelte-tiny-router';
     import { api }           from '../../urls.svelte';
+    import { error, yikes }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte';
 
     let { key } = $props();
 
-
-    let error = $state(null);
     let page = $state(null);
     let router = useTinyRouter();
 
@@ -15,10 +14,10 @@
         if (res.ok){
             page  = null;
             page  = await res.json();
-            error = null;
+            yikes();
             return true;
         } else {
-            error = await res.text();
+            error(res);
             return false;
         }
     }
@@ -38,9 +37,6 @@
 
     $effect(loadPage);
 </script>
-{#if error}
-<span class="error">{error}</span>
-{/if}
 {#if page}
 <div class="wiki page">
     <h2>{page.title}</h2>