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/modules/homework/components/homework-batch-grading-view.tsx

@@ -0,0 +1,168 @@
+"use client"
+
+import { useState, useTransition } from "react"
+import { useRouter } from "next/navigation"
+import { useTranslations } from "next-intl"
+import { Zap } from "lucide-react"
+import { toast } from "sonner"
+
+import { Button } from "@/shared/components/ui/button"
+import { Badge } from "@/shared/components/ui/badge"
+import { Checkbox } from "@/shared/components/ui/checkbox"
+import {
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from "@/shared/components/ui/table"
+import { formatDate } from "@/shared/lib/utils"
+import { batchAutoGradeSubmissionsAction } from "../actions"
+import type { HomeworkSubmissionListItem } from "../types"
+
+interface HomeworkBatchGradingViewProps {
+  submissions: HomeworkSubmissionListItem[]
+}
+
+/**
+ * V3-7: 批量批改视图
+ *
+ * 教师在提交列表页可勾选多份提交，一键自动批改所有客观题。
+ * 对标智学网的批量批改功能。
+ */
+export function HomeworkBatchGradingView({ submissions }: HomeworkBatchGradingViewProps) {
+  const t = useTranslations("examHomework")
+  const router = useRouter()
+  const [selectedIds, setSelectedIds] = useState<Set<string>>(new Set())
+  const [isPending, startTransition] = useTransition()
+
+  const selectableSubmissions = submissions.filter(
+    (s) => s.status === "submitted"
+  )
+
+  const allSelectableSelected =
+    selectableSubmissions.length > 0 &&
+    selectableSubmissions.every((s) => selectedIds.has(s.id))
+
+  const toggleSelectAll = () => {
+    if (allSelectableSelected) {
+      setSelectedIds(new Set())
+    } else {
+      setSelectedIds(new Set(selectableSubmissions.map((s) => s.id)))
+    }
+  }
+
+  const toggleSelect = (id: string) => {
+    setSelectedIds((prev) => {
+      const next = new Set(prev)
+      if (next.has(id)) {
+        next.delete(id)
+      } else {
+        next.add(id)
+      }
+      return next
+    })
+  }
+
+  const handleBatchAutoGrade = () => {
+    if (selectedIds.size === 0) {
+      toast.error(t("homework.grade.batchSelectAtLeastOne"))
+      return
+    }
+
+    startTransition(async () => {
+      const formData = new FormData()
+      formData.set("submissionIds", JSON.stringify(Array.from(selectedIds)))
+      const result = await batchAutoGradeSubmissionsAction(null, formData)
+      if (result.success) {
+        toast.success(result.message)
+        setSelectedIds(new Set())
+        router.refresh()
+      } else {
+        toast.error(result.message || t("homework.grade.batchFailed"))
+      }
+    })
+  }
+
+  return (
+    <div className="space-y-4">
+      {selectedIds.size > 0 && (
+        <div className="flex items-center justify-between rounded-lg border bg-muted/50 px-4 py-3">
+          <span className="text-sm font-medium">
+            {t("homework.grade.batchSelected", { count: selectedIds.size })}
+          </span>
+          <Button
+            onClick={handleBatchAutoGrade}
+            disabled={isPending}
+            size="sm"
+          >
+            <Zap className="mr-2 h-4 w-4" />
+            {t("homework.grade.batchAutoGrade")}
+          </Button>
+        </div>
+      )}
+
+      <div className="rounded-md border bg-card">
+        <Table>
+          <TableHeader>
+            <TableRow>
+              <TableHead className="w-[40px]">
+                <Checkbox
+                  checked={allSelectableSelected}
+                  onCheckedChange={toggleSelectAll}
+                  aria-label={t("homework.grade.selectAll")}
+                />
+              </TableHead>
+              <TableHead>{t("homework.grade.student")}</TableHead>
+              <TableHead>{t("homework.grade.status")}</TableHead>
+              <TableHead>{t("homework.grade.submitted")}</TableHead>
+              <TableHead>{t("homework.grade.score")}</TableHead>
+              <TableHead>{t("homework.grade.action")}</TableHead>
+            </TableRow>
+          </TableHeader>
+          <TableBody>
+            {submissions.map((s) => {
+              const isSelectable = s.status === "submitted"
+              const isSelected = selectedIds.has(s.id)
+              return (
+                <TableRow key={s.id} data-selected={isSelected}>
+                  <TableCell>
+                    {isSelectable ? (
+                      <Checkbox
+                        checked={isSelected}
+                        onCheckedChange={() => toggleSelect(s.id)}
+                        aria-label={t("homework.grade.selectRow")}
+                      />
+                    ) : (
+                      <span className="text-muted-foreground" aria-hidden="true">
+                        —
+                      </span>
+                    )}
+                  </TableCell>
+                  <TableCell className="font-medium truncate max-w-[160px]">{s.studentName}</TableCell>
+                  <TableCell>
+                    <Badge variant="outline" className="capitalize">
+                      {s.status}
+                    </Badge>
+                    {s.isLate ? <span className="ml-2 text-xs text-destructive">{t("homework.grade.late")}</span> : null}
+                  </TableCell>
+                  <TableCell className="text-muted-foreground tabular-nums">{s.submittedAt ? formatDate(s.submittedAt) : "-"}</TableCell>
+                  <TableCell className="tabular-nums">{typeof s.score === "number" ? s.score : "-"}</TableCell>
+                  <TableCell>
+                    <a
+                      href={`/teacher/homework/submissions/${s.id}`}
+                      className="text-sm underline-offset-4 hover:underline"
+                    >
+                      {t("homework.grade.title")}
+                    </a>
+                  </TableCell>
+                </TableRow>
+              )
+            })}
+          </TableBody>
+        </Table>
+      </div>
+    </div>
+  )
+}