Fix completing tasks, showing completed tasks, and stable display order. Sorting broken.

server/ajax/storage.go

@@ -8,6 +8,7 @@ import (
 	"local/todo-server/server/ajax/task"
 	"net/http"
 	"path"
+	"sort"
 	"strings"
 )
 
@@ -75,6 +76,9 @@ func (a *Ajax) storageListTasks(listID string, filters ...func(t *task.Task) boo
 			tasks = append(tasks, task)
 		}
 	}
+	sort.SliceStable(tasks, func(i, j int) bool {
+		return tasks[i].Created.Before(tasks[j].Created)
+	})
 	return tasks, nil
 }