clicking card in kanban now opens task in new tab/window

frontend/src/routes/project/Kanban.svelte

@@ -23,7 +23,6 @@
     let tasks        = $state({});
     let users        = {};
     let columns      = $derived(project.allowed_states?Object.keys(project.allowed_states).length+1:1);
-    const controller = new AbortController();
 
     $effect(() => updateUrl(filter_input));
 
@@ -175,8 +174,7 @@
     }
 
     function openTask(task_id){
-        controller.abort();
-        router.navigate(`/task/${task_id}/view`)
+        window.open(`/task/${task_id}/view`, '_blank').focus();
     }
 
     async function save_bookmark(){