refactor(lesson-preparation): V2 审计深度修复 — Server Actions i18n + 错误码模式 + 类型断言清零 + a11y 深度修复 + Tracker 埋点接入

V2-1: 12 个 Server Action 通过 getTranslations 翻译错误消息；Service/DataAccess 层抛出错误码异常（PublishServiceError/LessonPlanDataError），Actions 层通过 PUBLISH_ERROR_KEY_MAP 翻译为 i18n 消息
V2-2: SYSTEM_TEMPLATES name/title 改为 i18n 键，createLessonPlan 接受 translateTitle 函数在服务端翻译后存储到 DB
V2-3: 8 处 as unknown as 断言替换为显式类型映射函数（mapRowToLessonPlan/mapRowToListItem/mapRowToTemplate/mapRowToVersion）+ 类型守卫（isLessonPlanStatus/isTemplateType/isTemplateScope）
V2-4: MiniMap nodeColor 复用 lib/node-summary.ts 的 getNodeColor
V2-5: a11y 深度修复 — lesson-plan-filters/exercise-block/inline-question-editor 的 select 添加 label htmlFor 关联；exercise-block 题目列表改为 ul/li；node-editor 画布添加 role=application + 键盘导航配置
V2-6: Tracker 埋点接入 — 新增 useLessonPlanTrackerSafe hook，在 create/save/publish/revert/duplicate/archive 6 处调用 tracker.track

同步更新架构图 004 和 005 文档

src/modules/lesson-preparation/publish-service.ts

@@ -10,7 +10,7 @@ import { persistExamDraft, addExamQuestions } from "@/modules/exams/data-access"
 import { createHomeworkAssignment } from "@/modules/homework/data-access-write";
 import { getStudentIdsByClassIds } from "@/modules/classes/data-access";
 import { normalizeDocument } from "./data-access";
-import type { LessonPlanDocument, ExerciseBlockData } from "./types";
+import type { LessonPlanDocument, ExerciseBlockData, LessonPlan, LessonPlanStatus } from "./types";
 
 interface PublishInput {
   planId: string;
@@ -27,6 +27,32 @@ interface PublishResult {
   updatedContent: LessonPlanDocument;
 }
 
+// 类型守卫：安全地将 string 收窄为 LessonPlanStatus
+const LESSON_PLAN_STATUSES = ["draft", "published", "archived"] as const;
+function isLessonPlanStatus(v: string): v is LessonPlanStatus {
+  return (LESSON_PLAN_STATUSES as readonly string[]).includes(v);
+}
+
+/**
+ * publish-service 错误：使用错误码替代硬编码中文，
+ * 由 actions 层通过 PUBLISH_ERROR_KEY_MAP 翻译为 i18n 消息。
+ */
+export type PublishErrorCode =
+  | "PLAN_NOT_FOUND"
+  | "NO_PERMISSION"
+  | "NO_EXERCISE_BLOCK"
+  | "NO_QUESTIONS"
+  | "ALREADY_PUBLISHED"
+  | "NO_SUBJECT_OR_GRADE"
+  | "NO_STUDENTS";
+
+export class PublishServiceError extends Error {
+  constructor(public readonly code: PublishErrorCode) {
+    super(code);
+    this.name = "PublishServiceError";
+  }
+}
+
 export async function publishLessonPlanHomework(
   input: PublishInput,
 ): Promise<PublishResult> {
@@ -36,38 +62,43 @@ export async function publishLessonPlanHomework(
     .from(lessonPlans)
     .where(eq(lessonPlans.id, input.planId))
     .limit(1);
-  if (rows.length === 0) throw new Error("课案不存在");
-  const row = rows[0] as unknown as {
-    id: string;
-    content: unknown;
-    creatorId: string;
-    title: string;
-    textbookId: string | null;
-    chapterId: string | null;
-    subjectId: string | null;
-    gradeId: string | null;
-  };
-  const plan = {
-    ...row,
+  if (rows.length === 0) throw new PublishServiceError("PLAN_NOT_FOUND");
+  const row = rows[0];
+  // 类型守卫：从 Drizzle 推导类型收窄为 LessonPlan 所需字段
+  const plan: LessonPlan = {
+    id: row.id,
+    title: row.title,
+    textbookId: row.textbookId,
+    chapterId: row.chapterId,
+    coursePlanItemId: row.coursePlanItemId,
+    subjectId: row.subjectId,
+    gradeId: row.gradeId,
+    templateId: row.templateId,
+    templateName: row.templateName,
     content: normalizeDocument(row.content),
+    status: isLessonPlanStatus(row.status) ? row.status : "draft",
+    creatorId: row.creatorId,
+    lastSavedAt: row.lastSavedAt?.toISOString() ?? null,
+    createdAt: row.createdAt.toISOString(),
+    updatedAt: row.updatedAt.toISOString(),
   };
   if (plan.creatorId !== input.userId)
-    throw new Error("无权发布");
+    throw new PublishServiceError("NO_PERMISSION");
 
   // 2. 定位 exercise block
   const block = plan.content.nodes.find((b) => b.id === input.blockId);
   if (!block || block.type !== "exercise")
-    throw new Error("练习块不存在");
+    throw new PublishServiceError("NO_EXERCISE_BLOCK");
   const data = block.data as ExerciseBlockData;
-  if (data.items.length === 0) throw new Error("练习块无题目");
+  if (data.items.length === 0) throw new PublishServiceError("NO_QUESTIONS");
   if (data.publishedAssignmentId)
-    throw new Error("该练习块已发布，请使用'重新发布'");
+    throw new PublishServiceError("ALREADY_PUBLISHED");
 
   // 3. inline 题目入库，替换占位 ID
   const newContent: LessonPlanDocument = structuredClone(plan.content);
   const newBlock = newContent.nodes.find((b) => b.id === input.blockId);
   if (!newBlock || newBlock.type !== "exercise")
-    throw new Error("练习块不存在");
+    throw new PublishServiceError("NO_EXERCISE_BLOCK");
   const newData = newBlock.data as ExerciseBlockData;
 
   for (let i = 0; i < newData.items.length; i++) {
@@ -100,7 +131,7 @@ export async function publishLessonPlanHomework(
   // 4. 打包 exam 草稿
   const examId = createId();
   if (!plan.subjectId || !plan.gradeId) {
-    throw new Error("课案缺少学科或年级信息，无法发布");
+    throw new PublishServiceError("NO_SUBJECT_OR_GRADE");
   }
   await persistExamDraft({
     examId,
@@ -125,7 +156,7 @@ export async function publishLessonPlanHomework(
   const assignmentId = createId();
   const targetStudentIds = await getStudentIdsByClassIds(input.classIds);
   if (targetStudentIds.length === 0) {
-    throw new Error("所选班级无学生");
+    throw new PublishServiceError("NO_STUDENTS");
   }
   await createHomeworkAssignment({
     assignmentId,