feat(exams,homework,parent): V3 审计深度修复 — 批量批改/考试分析/提交反馈/家长视图/移动端优化

V3-5: exam-actions.tsx 集成 useExamHomeworkFeatures hook，按角色控制菜单项可见性
V3-7: 批量批改 — 新增 batchAutoGradeSubmissions data-access + Server Action + HomeworkBatchGradingView 组件
V3-8: 考试分析仪表盘 — 新增 getExamAnalytics stats-service + ExamAnalyticsDashboard 组件 + /teacher/exams/[id]/analytics 路由
V3-9: 提交后即时反馈页 — 新增 HomeworkSubmissionResult 组件 + /student/learning/assignments/[id]/result 路由
V3-11: 家长考试详情 — 新增 ChildExamDetail 组件 + getStudentExamResults data-access + child-detail-panel exams Tab
V3-12: 移动端触控优化 — 题目导航与考试操作按钮 44px 最小触控目标

修复: instrumentation.ts 适配器补全 questionCount/averageScore/overdueCount 字段
修复: exam-homework-port.ts 类型导入对齐 ExamWithQuestionsForHomework
修复: trend-line-chart.tsx 数据类型允许 undefined（classAverage 可选场景）

同步更新 004/005 架构文档

src/shared/components/charts/trend-line-chart.tsx

@@ -41,7 +41,7 @@ export interface TrendLineSeries {
 
 interface TrendLineChartProps {
   /** 图表数据 */
-  data: Array<Record<string, string | number>>
+  data: Array<Record<string, string | number | undefined>>
   /** 折线系列配置（支持单条或多条） */
   series: TrendLineSeries[]
   /** X 轴数据字段名（默认 "title"） */

src/shared/i18n/messages/en/exam-homework.json

@@ -96,6 +96,33 @@
     "error": {
       "notFound": "Exam not found",
       "loadFailed": "Failed to load exam"
+    },
+    "analytics": {
+      "title": "Exam Analytics",
+      "description": "View score distribution and per-question analysis",
+      "totalStudents": "Total Students",
+      "submitted": "Submitted",
+      "gradedCount": "Graded",
+      "assignmentCount": "Assignments",
+      "averageScore": "Average Score",
+      "passRate": "Pass Rate",
+      "scoreDistribution": "Score Distribution",
+      "scoreDistributionDesc": "Student count by percentage range",
+      "questionAnalysis": "Question Analysis",
+      "questionAnalysisDesc": "Error rate and difficulty (error rate >= 70% is hard)",
+      "questionType": "Type",
+      "questionText": "Question",
+      "maxScore": "Max Score",
+      "errorCount": "Errors",
+      "errorRate": "Error Rate",
+      "difficulty": "Difficulty",
+      "difficultyEasy": "Easy",
+      "difficultyMedium": "Medium",
+      "difficultyHard": "Hard",
+      "highErrorWarning": "High Error Rate Warning",
+      "highErrorWarningDesc": "The following questions have an error rate above 70% and are recommended for focused review",
+      "noData": "No analytics data yet. Data will be available after students submit and grading is complete.",
+      "viewAnalytics": "View Analytics"
     }
   },
   "homework": {
@@ -249,7 +276,13 @@
       "nextStudent": "Next Student",
       "prev": "Prev",
       "next": "Next",
-      "gradesAutoSaveNote": "Grades are saved automatically when you click Submit. Students will see their grades and feedback immediately after you submit."
+      "gradesAutoSaveNote": "Grades are saved automatically when you click Submit. Students will see their grades and feedback immediately after you submit.",
+      "batchAutoGrade": "Batch Auto-Grade",
+      "batchSelected": "{{count}} submissions selected",
+      "batchSelectAtLeastOne": "Please select at least one submission",
+      "batchFailed": "Batch grading failed",
+      "selectAll": "Select All",
+      "selectRow": "Select this row"
     },
     "review": {
       "title": "Review",
@@ -269,7 +302,23 @@
       "responseSummary": "Response Summary",
       "description": "Description",
       "noDescription": "No description provided.",
-      "totalScore": "Total Score"
+      "totalScore": "Total Score",
+      "correctAnswerTrue": "True",
+      "correctAnswerFalse": "False"
+    },
+    "result": {
+      "title": "Submission Result",
+      "scoreRate": "Score Rate",
+      "fullyGraded": "All questions have been graded",
+      "partiallyGraded": "Objective questions auto-graded. Subjective questions awaiting teacher review.",
+      "correctCount": "Correct",
+      "incorrectCount": "Incorrect",
+      "partialCount": "Partial",
+      "pendingCount": "Pending",
+      "wrongAnswersTitle": "Wrong Answers Preview",
+      "wrongAnswersDesc": "These questions need focused review",
+      "backToList": "Back to Assignments",
+      "viewErrorBook": "View Error Book"
     },
     "status": {
       "draft": "Draft",

src/shared/i18n/messages/zh-CN/exam-homework.json

@@ -96,6 +96,33 @@
     "error": {
       "notFound": "考试不存在",
       "loadFailed": "加载考试失败"
+    },
+    "analytics": {
+      "title": "考试分析",
+      "description": "查看考试成绩分布与逐题分析",
+      "totalStudents": "应考人数",
+      "submitted": "已提交",
+      "gradedCount": "已批改",
+      "assignmentCount": "关联作业数",
+      "averageScore": "平均分",
+      "passRate": "及格率",
+      "scoreDistribution": "分数段分布",
+      "scoreDistributionDesc": "按百分比区间统计学生人数",
+      "questionAnalysis": "逐题分析",
+      "questionAnalysisDesc": "错误率与难度等级（错误率≥70%为难题）",
+      "questionType": "题型",
+      "questionText": "题目",
+      "maxScore": "满分",
+      "errorCount": "错误数",
+      "errorRate": "错误率",
+      "difficulty": "难度",
+      "difficultyEasy": "简单",
+      "difficultyMedium": "中等",
+      "difficultyHard": "困难",
+      "highErrorWarning": "高错误率预警",
+      "highErrorWarningDesc": "以下题目错误率超过 70%，建议重点讲解",
+      "noData": "暂无分析数据，需等待学生提交并批改后生成",
+      "viewAnalytics": "查看分析"
     }
   },
   "homework": {
@@ -249,7 +276,13 @@
       "nextStudent": "下一名学生",
       "prev": "上一页",
       "next": "下一页",
-      "gradesAutoSaveNote": "点击提交后成绩将自动保存。学生将在您提交后立即看到成绩和反馈。"
+      "gradesAutoSaveNote": "点击提交后成绩将自动保存。学生将在您提交后立即看到成绩和反馈。",
+      "batchAutoGrade": "批量自动批改",
+      "batchSelected": "已选 {{count}} 份提交",
+      "batchSelectAtLeastOne": "请至少选择一份提交",
+      "batchFailed": "批量批改失败",
+      "selectAll": "全选",
+      "selectRow": "选择此行"
     },
     "review": {
       "title": "复习",
@@ -269,7 +302,23 @@
       "responseSummary": "作答概览",
       "description": "描述",
       "noDescription": "无描述。",
-      "totalScore": "总分"
+      "totalScore": "总分",
+      "correctAnswerTrue": "正确",
+      "correctAnswerFalse": "错误"
+    },
+    "result": {
+      "title": "提交结果",
+      "scoreRate": "得分率",
+      "fullyGraded": "所有题目已批改完成",
+      "partiallyGraded": "客观题已自动批改，主观题等待教师批改",
+      "correctCount": "正确",
+      "incorrectCount": "错误",
+      "partialCount": "部分正确",
+      "pendingCount": "待批改",
+      "wrongAnswersTitle": "错题预览",
+      "wrongAnswersDesc": "以下题目需要重点复习",
+      "backToList": "返回作业列表",
+      "viewErrorBook": "查看错题本"
     },
     "status": {
       "draft": "草稿",

src/shared/services/exam-homework-port.ts

@@ -18,6 +18,7 @@
 import type { DataScope } from "@/shared/types/permissions"
 import type { Exam } from "@/modules/exams/types"
 import type { HomeworkAssignmentListItem } from "@/modules/homework/types"
+import type { ExamWithQuestionsForHomework } from "@/modules/exams/data-access"
 
 /**
  * 考试/作业模块对外暴露的服务契约。
@@ -54,15 +55,7 @@ export interface ExamHomeworkServicePort {
 
   // ===== 跨模块 =====
   /** 获取考试及其题目（供作业模块引用考试内容时使用） */
-  getExamWithQuestionsForHomework(examId: string): Promise<{
-    exam: Pick<Exam, "id" | "title" | "totalScore" | "durationMin">
-    questions: Array<{
-      id: string
-      questionType: string
-      questionContent: unknown
-      maxScore: number
-    }>
-  } | null>
+  getExamWithQuestionsForHomework(examId: string): Promise<ExamWithQuestionsForHomework | null>
 }
 
 /**