feat(编辑能力): 支持复合对象内部编辑，优化提示文案与操作稳定性

assets/webui/index.html

@@ -67,6 +67,7 @@
 				<button id="multiSelectButton" class="button" type="button" aria-pressed="false" title="多选对象">多选</button>
 				<button id="editObjectButton" class="button" type="button" aria-label="修改对象" disabled>修改</button>
 				<button id="copyObjectButton" class="button" type="button" aria-label="复制对象" disabled>复制</button>
+				<button id="compositeBackButton" class="button" type="button" title="返回上层" hidden>返回</button>
 				<button id="deleteObjectButton" class="button" type="button" disabled>删除</button>
 				<select id="objectOrder" class="order-select" aria-label="对象层级" disabled>
 					<option value="" hidden>层级</option>