feat(app): add error/loading boundaries across all dashboard routes and new routes

- Add error.tsx and loading.tsx boundaries for admin, parent, student, teacher routes

- Add admin announcements edit, audit-logs overview, curriculum-map, invitation-codes, permissions, questions, roles routes

- Add admin elective detail and components, files, course-plans, users, scheduling boundaries

- Add messages group-compose route

- Add parent course-plans, elective, grades report-card, practice routes

- Add student course-plans, elective detail, error-book dialogs, grades report-card, learning study-path, leave, schedule boundaries

- Add teacher attendance report, classes boundaries, course-plans boundaries, elective, exams analytics/edit-rich/all/create/new, grades report-card, homework boundaries, leave, lesson-plans calendar

- Add auth loading, onboarding loading, api cron

src/app/(dashboard)/student/learning/assignments/[assignmentId]/page.tsx

@@ -1,7 +1,7 @@
 import { notFound } from "next/navigation"
 import { getTranslations } from "next-intl/server"
 
-import { getStudentHomeworkTakeData } from "@/modules/homework/data-access"
+import { getStudentHomeworkTakeData } from "@/modules/homework/data-access-student"
 import { getCurrentStudentUser } from "@/modules/users/data-access"
 import { HomeworkTakeView } from "@/modules/homework/components/homework-take-view"
 import { HomeworkReviewView } from "@/modules/homework/components/student-homework-review-view"

src/app/(dashboard)/student/learning/assignments/[assignmentId]/result/error.tsx

@@ -0,0 +1,28 @@
+"use client"
+
+import { AlertCircle } from "lucide-react"
+import { useTranslations } from "next-intl"
+
+import { EmptyState } from "@/shared/components/ui/empty-state"
+
+/**
+ * student/learning/assignments/[assignmentId]/result/error.tsx
+ * 学生作业结果页错误边界。
+ */
+export default function StudentResultError({ reset }: { error: Error & { digest?: string }; reset: () => void }) {
+  const t = useTranslations("examHomework")
+  return (
+    <div className="flex h-full flex-col items-center justify-center space-y-4 p-8">
+      <EmptyState
+        icon={AlertCircle}
+        title={t("homework.error.submissionNotFound")}
+        description={t("homework.error.loadFailed")}
+        action={{
+          label: t("common.retry"),
+          onClick: () => reset(),
+        }}
+        className="border-none shadow-none h-auto"
+      />
+    </div>
+  )
+}

src/app/(dashboard)/student/learning/assignments/[assignmentId]/result/loading.tsx

@@ -0,0 +1,22 @@
+import { Skeleton } from "@/shared/components/ui/skeleton"
+
+/**
+ * student/learning/assignments/[assignmentId]/result/loading.tsx
+ * 学生作业结果页骨架屏：标题 + 分数汇总卡片 + 错题预览骨架。
+ */
+export default function Loading() {
+  return (
+    <div className="flex h-full flex-col space-y-6 p-8">
+      <div className="space-y-2">
+        <Skeleton className="h-8 w-48" />
+        <Skeleton className="h-4 w-64" />
+      </div>
+      <div className="grid gap-4 md:grid-cols-3">
+        <Skeleton className="h-32 w-full" />
+        <Skeleton className="h-32 w-full" />
+        <Skeleton className="h-32 w-full" />
+      </div>
+      <Skeleton className="h-64 w-full" />
+    </div>
+  )
+}

src/app/(dashboard)/student/learning/assignments/[assignmentId]/result/page.tsx

@@ -1,7 +1,8 @@
 import type { JSX } from "react"
 import { notFound } from "next/navigation"
 import { getTranslations } from "next-intl/server"
-import { getHomeworkAssignmentById, getStudentSubmissionResult } from "@/modules/homework/data-access"
+import { getHomeworkAssignmentById } from "@/modules/homework/data-access"
+import { getStudentSubmissionResult } from "@/modules/homework/data-access-student"
 import { HomeworkSubmissionResult } from "@/modules/homework/components/homework-submission-result"
 import { getSession } from "@/shared/lib/session"
 

src/app/(dashboard)/student/learning/assignments/error.tsx

@@ -0,0 +1,28 @@
+"use client"
+
+import { AlertCircle } from "lucide-react"
+import { useTranslations } from "next-intl"
+
+import { EmptyState } from "@/shared/components/ui/empty-state"
+
+/**
+ * student/learning/assignments/error.tsx
+ * 学生作业列表错误边界。
+ */
+export default function StudentAssignmentsListError({ reset }: { error: Error & { digest?: string }; reset: () => void }) {
+  const t = useTranslations("examHomework")
+  return (
+    <div className="flex h-full flex-col items-center justify-center space-y-4 p-8">
+      <EmptyState
+        icon={AlertCircle}
+        title={t("homework.error.notFound")}
+        description={t("homework.error.loadFailed")}
+        action={{
+          label: t("common.retry"),
+          onClick: () => reset(),
+        }}
+        className="border-none shadow-none h-auto"
+      />
+    </div>
+  )
+}

src/app/(dashboard)/student/learning/assignments/page.tsx

@@ -7,7 +7,7 @@ import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui
 import { StatusBadge } from "@/shared/components/ui/status-badge"
 import { formatDate, cn } from "@/shared/lib/utils"
 import { getParam, type SearchParams } from "@/shared/lib/search-params"
-import { getStudentHomeworkAssignments } from "@/modules/homework/data-access"
+import { getStudentHomeworkAssignments } from "@/modules/homework/data-access-student"
 import { getCurrentStudentUser } from "@/modules/users/data-access"
 import { AssignmentFilters } from "@/modules/homework/components/assignment-filters"
 import { Inbox, UserX, TriangleAlert } from "lucide-react"