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/diagnostic/student/[studentId]/page.tsx

@@ -1,6 +1,7 @@
 import type { JSX } from "react"
 import { notFound } from "next/navigation"
 import { Stethoscope } from "lucide-react"
+import { getTranslations } from "next-intl/server"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import {
@@ -10,7 +11,7 @@ import {
 import { getDiagnosticReports } from "@/modules/diagnostic/data-access-reports"
 import { getStudentActiveClassId } from "@/modules/classes/data-access"
 import { StudentDiagnosticView } from "@/modules/diagnostic/components/student-diagnostic-view"
-import { WidgetBoundary } from "@/modules/grades/components/widget-boundary"
+import { WidgetBoundary } from "@/shared/components/widget-boundary"
 import type { MasteryRadarPoint } from "@/modules/diagnostic/types"
 
 export const dynamic = "force-dynamic"
@@ -22,6 +23,7 @@ export default async function StudentDiagnosticPage({
 }): Promise<JSX.Element> {
   const { studentId } = await params
   const ctx = await requirePermission(Permissions.DIAGNOSTIC_READ)
+  const t = await getTranslations("diagnostic")
 
   // DataScope 二次校验：学生只能看自己，家长只能看子女
   if (ctx.dataScope.type === "class_members" && ctx.userId !== studentId) {
@@ -67,18 +69,18 @@ export default async function StudentDiagnosticPage({
       <div>
         <h1 className="flex items-center gap-2 text-2xl font-bold tracking-tight">
           <Stethoscope className="h-6 w-6" aria-hidden="true" />
-          Student Diagnostic
+          {t("title.teacherStudent")}
         </h1>
         <p className="text-muted-foreground">
-          Knowledge point mastery analysis and diagnostic reports.
+          {t("title.teacherStudentDesc")}
         </p>
       </div>
-      <WidgetBoundary title="学生学情诊断" skeletonHeight={400}>
+      <WidgetBoundary title={t("title.teacherStudent")} skeletonHeight={400}>
         <StudentDiagnosticView
           summary={summary}
           reports={reports}
           classAverageMastery={classAverageMastery}
-          practiceHrefBase="/teacher/questions"
+          role="teacher"
         />
       </WidgetBoundary>
     </div>