feat(lesson-preparation): 师生交互 block（详情编辑入口）

src/modules/lesson-preparation/components/blocks/interaction-block.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import type { InteractionBlockData } from "../../types";
+import { QaEditor } from "../detail-panel/qa-editor";
+
+interface Props {
+  blockId: string;
+  data: InteractionBlockData;
+  onUpdate: (data: InteractionBlockData) => void;
+}
+
+/**
+ * V4 师生交互 block：详情面板中的编辑入口。
+ * 实际编辑器是 QaEditor（复用）。
+ */
+export function InteractionBlock({ blockId, data, onUpdate }: Props) {
+  void onUpdate;
+  return <QaEditor nodeId={blockId} data={data} />;
+}