implemented (temporary) display of closed tasks in project list

frontend/src/routes/project/View.svelte

@@ -20,6 +20,7 @@
     let router         = useTinyRouter();
     let showSettings   = $state(false);
     let tasks          = $state(null);
+    let show_closed    = $state(false);
 
     let new_state = $state({code:null,name:null})
     let state_available=$derived(new_state.name && new_state.code && !project.allowed_states[new_state.code]);
@@ -139,6 +140,11 @@
         update({members:members});
     }
 
+    function showClosed(){
+        show_closed = !show_closed;
+        loadTasks();
+    }
+
     onMount(loadProject);
 </script>
 
@@ -252,10 +258,11 @@
             <th>
                 {t('tasks')}
                 <button onclick={addTask}>{t('add_object',{object:t('task')})}</button>
+                <button onclick={showClosed}>{t('display_closed')}</button>
             </th>
             <td class="tasks">
                 {#if tasks}
-                <TaskList {tasks} {estimated_time} states={project?.allowed_states} show_closed={project.show_closed} />
+                <TaskList {tasks} {estimated_time} states={project?.allowed_states} show_closed={show_closed || project.show_closed} />
                 {/if}
             </td>
         </tr>

frontend/src/routes/task/TaskList.svelte

@@ -12,4 +12,4 @@
     {#each sortedTasks as task}
     <ListTask {states} {task} siblings={tasks} {estimated_time} show_closed={show_closed || task.show_closed} />
     {/each}
-</ul>
+</ul>