refactor: 清理未使用的源码片段

src/components/MindMapViewer.vue

@@ -27,13 +27,9 @@ const props = defineProps<{
   height?: string;
   /** 节点可选择模式（点击节点触发 node-select 事件） */
   selectable?: boolean;
-  /** 当前选中的节点路径（用于高亮，仅在 selectable 模式下生效） */
-  selectedPath?: string;
 }>();
 
 const emit = defineEmits<{
-  /** 编辑模式下结构变化时抛出最新大纲文本 */
-  (e: "change", outline: string): void;
   /** 点击带溯源信息的节点 */
   (e: "node-click", node: { sourceType: string; sourceId: number }): void;
   /** 选择模式下点击节点，返回标题+路径 */
@@ -156,12 +152,6 @@ const render = () => {
   });
   instance.init(toElixirData(props.tree));
 
-  if (props.editable) {
-    instance.bus.addListener("operation", () => {
-      emit("change", toOutline());
-    });
-  }
-
   // mind-elixir v5: selectNode(el) is called on every node click, but the
   // selectNewNode event is never fired (it requires selectNode(el, true),
   // which the default click handler never passes). Monkey-patch selectNode