lesson的步骤、阶段顺序调整ok

Html/apps/templates/lesson.html

@@ -8,6 +8,7 @@
     <link rel="stylesheet" href="/static/css/dashboard.css">
     <link rel="stylesheet" href="/static/css/lesson.css">
     <link rel="stylesheet" href="/static/css/teacher_course_setting.css">
+    <link rel="stylesheet" href="/static/css/lesson_setting.css">
     
 
     <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
@@ -39,6 +40,10 @@
   <!-- 课时编辑页主体：左侧大纲 + 右侧编辑 -->
   <div class="lesson-editor">
     <aside class="outline">
+      <button id="toggle-outline-reorder" class="reorder-btn" title="排序模式" aria-pressed="false">
+        排序
+      </button>
+      
       <ul id="outline-tree"></ul>
     </aside>