refactored more error code

frontend/src/routes/document/Send.svelte

@@ -3,12 +3,12 @@
     import { useTinyRouter } from 'svelte-tiny-router';
 
     import { api }           from '../../urls.svelte.js';
+    import { error, yikes }  from '../../warn.svelte';
     import { t }             from '../../translations.svelte.js';
 
     let   content = $state(null);
     let   doc     = $state(null);
     let   email   = $state(null);
-    let   error   = $state(null);
     const router  = useTinyRouter();
     let   subject = $state(null);
     let { id }    = $props();
@@ -20,9 +20,9 @@
             doc     = await resp.json();
             email   = doc.customer.email;
             subject = t('new_document_from',{type:t(doc.type),sender:doc.company.name,number:doc.number}),
-            error   = null;
+            yikes();
         } else {
-            error = await resp.text();
+            error(resp);
             return;
         }
         url  = api(`document/${id}/settings`);
@@ -31,7 +31,7 @@
             const settings = await resp.json();
             content        = settings.content;
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
@@ -46,17 +46,13 @@
         if (resp.ok){
             router.navigate(`/document?company_id=${doc.company.id}`);
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
     onMount(loadDoc);
 </script>
 
-{#if error}
-<span class="error">{error}</span>
-{/if}
-
 <fieldset>
     <legend>{t('customer_email')} / {t('subject')}</legend>
     <input type="text" bind:value={email} />