refactored more error code

frontend/src/routes/task/Add.svelte

@@ -3,6 +3,7 @@
     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 { user }          from '../../user.svelte.js';
 
@@ -11,7 +12,6 @@
     import Tags              from '../tags/TagList.svelte';
 
     let { project_id = null, parent_task_id } = $props();
-    let error            = $state(null);
     let project          = $state(null);
     let extendedSettings = $state(false);
     let parent_task      = $state(null);
@@ -54,10 +54,10 @@
             parent_task         = await resp.json();
             task.parent_task_id = +parent_task_id;
             project_id          = parent_task.project_id;
-            error               = null;
+            yikes();
             project             = null; // TODO
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
@@ -67,9 +67,9 @@
         if (resp.ok){
             project           = await resp.json();
             task.project_id   = +project_id;
-            error             = null;
+            yikes();
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
@@ -111,9 +111,9 @@
             if (task.parent_task_id){
                 router.navigate(`/task/${task.parent_task_id}/view`);
             } else router.navigate(`/task/${task.id}/view`);
-            error = null;
+            yikes();
         } else {
-            error = await resp.text();
+            error(resp);
         }
     }
 
@@ -130,9 +130,6 @@
 
 <fieldset>
     <legend>{t('add_object',{object:t('task')})}</legend>
-    {#if error}
-    <span class="error">{error}</span>
-    {/if}
     <table {onkeydown}>
         <tbody>
             <tr>