feat(lesson-preparation): 备课模块审计重构 — 跨模块解耦 + i18n + 纯函数抽取 + 错误边界

P0-1 跨模块直查修复：publish-service 不再直查 examQuestions 表，新增 exams/data-access.addExamQuestions 接口，复用 classes/data-access.getStudentIdsByClassIds

P0-2 i18n 接入：新增 zh-CN/en 翻译文件，注册 lessonPreparation 命名空间，17 个组件改造为 useTranslations/getTranslations

P1 纯函数抽取：lib/document-migration.ts（类型守卫替代 as 断言）、lib/node-summary.ts（翻译函数注入）、lib/rf-mappers.ts

P1 错误边界+骨架屏：新增 LessonPlanErrorBoundary 和 4 个 Skeleton 组件

P1 Block 注册表：新增 config/block-registry.tsx（BlockRenderer 组件），node-edit-panel 重构为配置驱动渲染

P1 其他修复：exercise-block 改用 router.refresh()，node-editor/lesson-node 复用 lib/ 纯函数

架构图同步：更新 004 和 005 文档

Refs: docs/architecture/audit/lesson-preparation-audit-report.md

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

@@ -1,6 +1,8 @@
 "use client";
 
 import { useState } from "react";
+import { useRouter } from "next/navigation";
+import { useTranslations } from "next-intl";
 import { useLessonPlanEditor } from "../../hooks/use-lesson-plan-editor";
 import { QuestionBankPicker } from "../question-bank-picker";
 import { InlineQuestionEditor } from "../inline-question-editor";
@@ -10,15 +12,20 @@ import { Plus, Trash2 } from "lucide-react";
 import type {
   ExerciseBlockData,
   ExerciseItem,
+  ExercisePurpose,
 } from "../../types";
 
 interface Props {
   blockId: string;
   data: ExerciseBlockData;
   classes: { id: string; name: string }[];
+  textbookId?: string;
+  chapterId?: string;
 }
 
-export function ExerciseBlock({ blockId, data, classes }: Props) {
+export function ExerciseBlock({ blockId, data, classes, textbookId, chapterId }: Props) {
+  const t = useTranslations("lessonPreparation");
+  const router = useRouter();
   const { updateNode, planId } = useLessonPlanEditor();
   const [showBank, setShowBank] = useState(false);
   const [showInline, setShowInline] = useState(false);
@@ -49,34 +56,34 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
         <select
           value={data.purpose}
           onChange={(e) =>
-            update({ purpose: e.target.value as never })
+            update({ purpose: e.target.value as ExercisePurpose })
           }
           className="border rounded px-2 py-1 text-sm"
         >
-          <option value="class_practice">课堂练习</option>
-          <option value="after_class_homework">课后作业</option>
+          <option value="class_practice">{t("exercise.purpose.class_practice")}</option>
+          <option value="after_class_homework">{t("exercise.purpose.after_class_homework")}</option>
         </select>
       </div>
       {data.items.length === 0 ? (
         <p className="text-on-surface-variant text-sm p-4 text-center border border-dashed rounded">
-          暂无题目，点击下方按钮添加
+          {t("questionBank.empty")}
         </p>
       ) : (
         <div className="space-y-1">
           {data.items.map((item, idx) => (
             <div
-              key={idx}
+              key={item.questionId}
               className="flex items-center gap-2 border rounded p-2"
             >
               <span className="text-xs bg-surface-container-highest px-2 py-0.5 rounded">
-                {item.source === "bank" ? "题库" : "新建"}
+                {item.source === "bank" ? t("questionBank.source.bank") : t("questionBank.source.inline")}
               </span>
               <span className="text-sm flex-1 truncate">
                 {item.source === "bank"
-                  ? `题目 ${item.questionId.slice(0, 8)}`
-                  : "课案内新建题目"}
+                  ? t("questionBank.questionId", { id: item.questionId.slice(0, 8) })
+                  : t("questionBank.inlineQuestion")}
               </span>
-              <span className="text-xs">{item.score}分</span>
+              <span className="text-xs">{t("questionBank.score", { score: item.score })}</span>
               <button onClick={() => removeItem(idx)}>
                 <Trash2 className="w-3 h-3 text-error" />
               </button>
@@ -91,7 +98,7 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
           onClick={() => setShowBank(true)}
         >
           <Plus className="w-3 h-3 mr-1" />
-          从题库添加
+          {t("questionBank.fromBank")}
         </Button>
         <Button
           variant="outline"
@@ -99,18 +106,18 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
           onClick={() => setShowInline(true)}
         >
           <Plus className="w-3 h-3 mr-1" />
-          新建题目
+          {t("questionBank.inlineNew")}
         </Button>
         {data.publishedAssignmentId ? (
           <div className="flex items-center gap-2 text-sm">
             <span className="bg-tertiary-container/20 text-tertiary px-2 py-1 rounded">
-              已发布为作业
+              {t("status.publishedAsHomework")}
             </span>
             <a
               href="/teacher/homework"
               className="text-primary underline"
             >
-              查看
+              {t("action.viewHomework")}
             </a>
           </div>
         ) : (
@@ -120,7 +127,7 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
               size="sm"
               onClick={() => setShowPublish(true)}
             >
-              发布为作业
+              {t("action.publish")}
             </Button>
           )
         )}
@@ -134,6 +141,8 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
       )}
       {showInline && (
         <InlineQuestionEditor
+          textbookId={textbookId}
+          chapterId={chapterId}
           onAdd={(item) => {
             addItems([item]);
             setShowInline(false);
@@ -147,7 +156,7 @@ export function ExerciseBlock({ blockId, data, classes }: Props) {
           blockId={blockId}
           classes={classes}
           onClose={() => setShowPublish(false)}
-          onPublished={() => window.location.reload()}
+          onPublished={() => router.refresh()}
         />
       )}
     </div>

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

@@ -1,5 +1,6 @@
 "use client";
 
+import { useTranslations } from "next-intl";
 import { RichTextBlock } from "./rich-text-block";
 import type { RichTextBlockData } from "../../types";
 
@@ -9,6 +10,7 @@ interface Props {
 }
 
 export function ReflectionBlock(props: Props) {
+  const t = useTranslations("lessonPreparation");
   // 教学反思在 P1 阶段与普通富文本一致，P3 再扩展学情数据嵌入
-  return <RichTextBlock {...props} hint="课后填写教学反思..." />;
+  return <RichTextBlock {...props} hint={t("reflection.hint")} />;
 }

src/modules/lesson-preparation/components/blocks/rich-text-block.tsx

@@ -4,6 +4,7 @@ import { useEditor, EditorContent } from "@tiptap/react";
 import StarterKit from "@tiptap/starter-kit";
 import Placeholder from "@tiptap/extension-placeholder";
 import { useEffect, useState } from "react";
+import { useTranslations } from "next-intl";
 import type { RichTextBlockData } from "../../types";
 import { KnowledgePointPicker } from "../knowledge-point-picker";
 import { Tag } from "lucide-react";
@@ -23,10 +24,11 @@ export function RichTextBlock({
   chapterId,
   onUpdate,
 }: Props) {
+  const t = useTranslations("lessonPreparation");
   const editor = useEditor({
     extensions: [
       StarterKit,
-      Placeholder.configure({ placeholder: hint ?? "输入内容..." }),
+      Placeholder.configure({ placeholder: hint ?? t("richText.placeholder") }),
     ],
     content: data.html,
     immediatelyRender: false,
@@ -56,7 +58,7 @@ export function RichTextBlock({
       <div className="flex items-center gap-2 mt-2 px-3 flex-wrap">
         {data.knowledgePointIds.length > 0 && (
           <span className="text-xs text-on-surface-variant">
-            已关联 {data.knowledgePointIds.length} 个知识点
+            {t("knowledgePoint.linked", { count: data.knowledgePointIds.length })}
           </span>
         )}
         <button
@@ -64,7 +66,7 @@ export function RichTextBlock({
           className="text-xs text-primary hover:underline inline-flex items-center gap-1"
         >
           <Tag className="w-3 h-3" />
-          标注知识点
+          {t("knowledgePoint.annotate")}
         </button>
       </div>
       {showKpPicker && (
@@ -78,4 +80,4 @@ export function RichTextBlock({
       )}
     </div>
   );
-}
+}

src/modules/lesson-preparation/components/blocks/text-study-block.tsx

@@ -1,6 +1,7 @@
 "use client";
 
 import { useState } from "react";
+import { useTranslations } from "next-intl";
 import { useLessonPlanEditor } from "../../hooks/use-lesson-plan-editor";
 import { Button } from "@/shared/components/ui/button";
 import { Plus, Trash2 } from "lucide-react";
@@ -16,6 +17,7 @@ interface Props {
 }
 
 export function TextStudyBlock({ blockId, data }: Props) {
+  const t = useTranslations("lessonPreparation");
   const { updateNode } = useLessonPlanEditor();
   const [selection, setSelection] = useState<{
     start: number;
@@ -26,26 +28,23 @@ export function TextStudyBlock({ blockId, data }: Props) {
     updateNode(blockId, { data: { ...data, ...patch } });
   }
 
-  function handleTextSelect() {
-    const sel = window.getSelection();
-    if (!sel || sel.rangeCount === 0) return;
-    const range = sel.getRangeAt(0);
-    // 简化：用相对 sourceText 的字符偏移
-    const start = range.startOffset;
-    const end = range.endOffset;
+  function handleTextSelect(e: React.MouseEvent<HTMLTextAreaElement>) {
+    const textarea = e.currentTarget;
+    const start = textarea.selectionStart;
+    const end = textarea.selectionEnd;
     if (end > start) setSelection({ start, end });
   }
 
   function addAnnotation() {
     if (!selection) {
-      alert("请先在课文中选中一段文本");
+      alert(t("textStudy.selectFirst"));
       return;
     }
     const ann: TextStudyAnnotation = {
       id: createId(),
       anchor: selection,
       nodeType: "language_feature",
-      title: "教学节点",
+      title: t("textStudy.annotationTitle"),
       note: "",
       color: "yellow",
     };
@@ -62,13 +61,13 @@ export function TextStudyBlock({ blockId, data }: Props) {
   return (
     <div className="space-y-3">
       <div>
-        <label className="text-sm font-medium">课文原文</label>
+        <label className="text-sm font-medium">{t("textStudy.sourceTextLabel")}</label>
         <textarea
           value={data.sourceText}
           onChange={(e) => update({ sourceText: e.target.value })}
           onMouseUp={handleTextSelect}
           className="w-full border rounded p-2 mt-1 min-h-[120px] font-serif leading-loose"
-          placeholder="粘贴课文原文，选中文本后可添加教学节点"
+          placeholder={t("textStudy.sourceTextPlaceholder")}
         />
       </div>
       <Button
@@ -78,7 +77,7 @@ export function TextStudyBlock({ blockId, data }: Props) {
         disabled={!selection}
       >
         <Plus className="w-3 h-3 mr-1" />
-        为选中文本添加节点
+        {t("textStudy.addAnnotation")}
       </Button>
       {data.annotations.length > 0 && (
         <div className="space-y-2">
@@ -117,7 +116,7 @@ export function TextStudyBlock({ blockId, data }: Props) {
                   })
                 }
                 className="w-full text-sm border rounded p-1 mt-1 min-h-[40px]"
-                placeholder="教学说明..."
+                placeholder={t("textStudy.annotationNotePlaceholder")}
               />
             </div>
           ))}