wirking on global error display

Signed-off-by: Stephan Richter <s.richter@srsoftware.de>

frontend/src/routes/task/RequiredTasks.svelte

@@ -3,12 +3,12 @@
     import { useTinyRouter } from 'svelte-tiny-router';
 
     import { api } from '../../urls.svelte';
+    import { error, yikes }  from '../../warn.svelte';
     import { t }   from '../../translations.svelte';
 
     let { task = null }     = $props();
 
     let candidates    = $state({});
-    let error         = $state(null);
     let key           = $state(null);
     let requiredTasks = $state({});
     let router        = useTinyRouter();
@@ -19,7 +19,7 @@
         let url = api(`task/${new_task_id}`);
         let resp = await fetch(url,{ credentials : 'include' });
         if (resp.ok){
-            error = null;
+            yikes();
             let newTask = await resp.json();
             if (newTask.project_id != task.project_id){
                 alert('project mismatch!');
@@ -30,7 +30,7 @@
             await patch();
             delete candidates[new_task_id];
         } else {
-            error = await resp.text();
+            error(await resp.text());
         }
     }
 
@@ -47,12 +47,12 @@
             body        : JSON.stringify(data)
         });
         if (res.ok) {
-            error      = null;
+            yikes();
             candidates = await res.json();
             for (var taskId of Object.keys(requiredTasks)) delete candidates[taskId];
             delete candidates[task.id];
         } else {
-            error = await res.text();
+            error(await res.text());
         }
     }
 
@@ -65,10 +65,10 @@
             body        : JSON.stringify({ids:task.required_tasks_ids})
         });
         if (res.ok){
-            error = null;
+            yikes();
             requiredTasks = await res.json();
         } else {
-            error = await res.text();
+            error(await res.text());
         }
     }
 
@@ -91,9 +91,7 @@
                 method      : 'PATCH',
                 body        : JSON.stringify({required_tasks_ids:task.required_tasks_ids})
             });
-            if (!resp.ok){
-                error = await resp.text();
-            }
+            if (!resp.ok) error(await resp.text());
     }
 
     async function unlink(required_task){