refactored more error code

frontend/src/routes/project/Create.svelte

@@ -2,13 +2,13 @@
     import { useTinyRouter } from 'svelte-tiny-router';
 
     import { api }           from '../../urls.svelte.js';
+    import { error, yikes }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte.js';
 
     import CompanySelector   from '../../Components/CompanySelector.svelte';
     import MarkdownEditor    from '../../Components/MarkdownEditor.svelte';
     import Tags              from '../tags/TagList.svelte';
 
-    let error        = $state(null);
     let ready        = $derived(!!project.name.trim())
     const router     = useTinyRouter();
     let showSettings = $state(false);
@@ -32,7 +32,7 @@
             var newProject = await resp.json();
             router.navigate(`/project/${newProject.id}/view`);
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
@@ -50,9 +50,6 @@
     label{ display: block }
 </style>
 
-{#if error}
-<span class="error">{error}</span>
-{/if}
 <form {onsubmit}>
     <fieldset>
         <legend>