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/classes/my/page.tsx

@@ -1,18 +1,31 @@
+import type { Metadata } from "next"
 import type { JSX } from "react"
+import { getTranslations } from "next-intl/server"
 import { requirePermission } from "@/shared/lib/auth-guard"
 import { Permissions } from "@/shared/types/permissions"
 import { getClassSubjects, getTeacherClasses } from "@/modules/classes/data-access"
+import { ClassErrorBoundary } from "@/modules/classes/components/class-error-boundary"
 import { MyClassesGrid } from "@/modules/classes/components/my-classes-grid"
 
 export const dynamic = "force-dynamic"
 
+export async function generateMetadata(): Promise<Metadata> {
+  const t = await getTranslations("classes")
+  return {
+    title: `${t("metadata.myClasses")} - Next_Edu`,
+    description: t("metadata.myClasses"),
+  }
+}
+
 export default async function MyClassesPage(): Promise<JSX.Element> {
   await requirePermission(Permissions.CLASS_READ)
   const [classes, subjectOptions] = await Promise.all([getTeacherClasses(), getClassSubjects()])
 
   return (
     <div className="flex h-full flex-col space-y-4 p-8">
-      <MyClassesGrid classes={classes} subjectOptions={subjectOptions} />
+      <ClassErrorBoundary>
+        <MyClassesGrid classes={classes} subjectOptions={subjectOptions} />
+      </ClassErrorBoundary>
     </div>
   )
 }