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)/teacher/homework/assignments/create/page.tsx

@@ -4,12 +4,14 @@ import { getExams } from "@/modules/exams/data-access"
 import { getTeacherClasses } from "@/modules/classes/data-access"
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { getAuthContext } from "@/shared/lib/auth-guard"
+import { getTranslations } from "next-intl/server"
 import { FileQuestion } from "lucide-react"
 
 export const dynamic = "force-dynamic"
 
 export default async function CreateHomeworkAssignmentPage(): Promise<JSX.Element> {
   const { dataScope } = await getAuthContext()
+  const t = await getTranslations("examHomework")
   const [exams, classes] = await Promise.all([getExams({ scope: dataScope }), getTeacherClasses()])
   const options = exams.map((e) => ({ id: e.id, title: e.title }))
 
@@ -17,17 +19,17 @@ export default async function CreateHomeworkAssignmentPage(): Promise<JSX.Elemen
     <div className="flex h-full flex-col space-y-8 p-8">
       <div className="flex items-center justify-between">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Create Assignment</h1>
-          <p className="text-muted-foreground">快速发布文本作业或从考试派生。</p>
+          <h1 className="text-2xl font-bold tracking-tight">{t("homework.form.createTitle")}</h1>
+          <p className="text-muted-foreground">{t("homework.form.createDescription")}</p>
         </div>
       </div>
 
       {classes.length === 0 ? (
         <EmptyState
-          title="No classes available"
-          description="Create a class first, then publish homework to that class."
+          title={t("homework.form.noClassesAvailable")}
+          description={t("homework.form.noClassesDescription")}
           icon={FileQuestion}
-          action={{ label: "Go to Classes", href: "/teacher/classes/my" }}
+          action={{ label: t("homework.form.goToClasses"), href: "/teacher/classes/my" }}
         />
       ) : (
         <HomeworkAssignmentForm exams={options} classes={classes} />