feat(lesson-preparation): 左栏结构树容器

src/modules/lesson-preparation/components/structure-tree/structure-tree.tsx

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+"use client";
+
+import { useMemo, useState } from "react";
+import { useTranslations } from "next-intl";
+import { useLessonPlanEditor } from "../../hooks/use-lesson-plan-editor";
+import { TreeNodeRow } from "./tree-node-row";
+import type { Block, InteractionBlockData, LessonPlanNode, TextbookContentNode } from "../../types";
+
+export function StructureTree() {
+  const t = useTranslations("lessonPreparation");
+  const doc = useLessonPlanEditor((s) => s.doc);
+  const expandedNodeIds = useLessonPlanEditor((s) => s.expandedNodeIds);
+  const addNode = useLessonPlanEditor((s) => s.addNode);
+  const [expandedTreeNodes, setExpandedTreeNodes] = useState<Set<string>>(new Set());
+
+  // V1：默认添加 rich_text 节点（V2 接入节点类型选择对话框）
+  const onAddNode = () => {
+    const id = addNode("rich_text");
+    // 自动选中新节点（addNode 内部已设置 selectedNodeId）
+    void id;
+  };
+
+  const textbookNode = doc.nodes.find((n): n is TextbookContentNode => n.type === "textbook_content");
+  const teachingNodes = useMemo(
+    () =>
+      doc.nodes
+        .filter((n): n is LessonPlanNode => n.type !== "textbook_content")
+        .sort((a, b) => a.order - b.order),
+    [doc.nodes],
+  );
+
+  const toggleTreeNode = (id: string) => {
+    setExpandedTreeNodes((prev) => {
+      const next = new Set(prev);
+      if (next.has(id)) next.delete(id);
+      else next.add(id);
+      return next;
+    });
+  };
+
+  return (
+    <aside
+      style={{
+        borderRight: "1px solid var(--border)",
+        background: "var(--background)",
+        padding: "16px 12px",
+        overflowY: "auto",
+      }}
+    >
+      <div
+        style={{
+          fontSize: 10,
+          fontWeight: 600,
+          textTransform: "uppercase",
+          letterSpacing: "0.08em",
+          color: "var(--muted-foreground)",
+          padding: "0 8px 12px",
+          display: "flex",
+          justifyContent: "space-between",
+        }}
+      >
+        <span>{t("v4.tree.title")}</span>
+        <span style={{ fontWeight: 500, letterSpacing: 0 }}>
+          {teachingNodes.length} {t("v4.tree.countSuffix")}
+        </span>
+      </div>
+
+      <div style={{ fontSize: 13 }}>
+        {/* 正文节点（始终在最上） */}
+        {textbookNode && (
+          <TreeNodeRow
+            node={{ ...textbookNode, type: "textbook_content" } as unknown as Block}
+            isExpanded={false}
+          />
+        )}
+
+        {/* 教学节点 */}
+        {teachingNodes.map((node) => {
+          const isExpanded = expandedNodeIds.includes(node.id);
+          const isTreeNodeExpanded = expandedTreeNodes.has(node.id);
+
+          // 师生交互节点：子节点为对话轮次
+          let childItems: { id: string; label: string; kind: string }[] = [];
+          let hasChildren = false;
+          if (node.type === "interaction") {
+            const data = node.data as InteractionBlockData;
+            hasChildren = (data.turns?.length ?? 0) > 0;
+            childItems = (data.turns ?? []).map((turn, idx) => ({
+              id: turn.id,
+              label: `${t("v4.interaction.round", { n: idx + 1 })} · ${turn.role === "teacher" ? t("v4.interaction.roleTeacher") : t("v4.interaction.roleStudent")}`,
+              kind: turn.role === "teacher" ? t("v4.interaction.roleTeacher") : t("v4.interaction.roleStudent"),
+            }));
+          }
+
+          return (
+            <TreeNodeRow
+              key={node.id}
+              node={node}
+              isExpanded={isExpanded}
+              hasChildren={hasChildren}
+              isChildrenExpanded={isTreeNodeExpanded}
+              onToggleChildren={() => toggleTreeNode(node.id)}
+              children={childItems}
+            />
+          );
+        })}
+      </div>
+
+      <div
+        style={{
+          marginTop: 10,
+          padding: "7px 8px",
+          border: "1px dashed var(--border)",
+          borderRadius: 5,
+          textAlign: "center",
+          fontSize: 12,
+          color: "var(--muted-foreground)",
+          cursor: "pointer",
+        }}
+        onClick={onAddNode}
+      >
+        + {t("v4.tree.addNode")}
+      </div>
+    </aside>
+  );
+}