feat(lesson-preparation): isInteractionBlockData 类型守卫

src/modules/lesson-preparation/lib/type-guards.ts

@@ -156,6 +156,18 @@ export function isReflectionBlockData(data: BlockData): data is ReflectionBlockD
   return isObject(data) && Array.isArray(data.reflection);
 }
 
+export function isInteractionBlockData(
+  data: unknown,
+): data is import("../types").InteractionBlockData {
+  if (typeof data !== "object" || data === null) return false;
+  const d = data as Record<string, unknown>;
+  return (
+    typeof d.designIntent === "string" &&
+    Array.isArray(d.turns) &&
+    Array.isArray(d.knowledgePointIds)
+  );
+}
+
 // ---- Block 字段值类型守卫（用于 select onChange 等场景，替代 `as` 断言）----
 
 const BLACKBOARD_LAYOUTS = ["structure", "mindmap", "text"] as const;
@@ -244,6 +256,7 @@ const VALID_BLOCK_TYPES: BlockType[] = [
   "exercise",
   "rich_text",
   "reflection",
+  "interaction",
 ];
 export function isBlockType(v: string): v is BlockType {
   return (VALID_BLOCK_TYPES as readonly string[]).includes(v);