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/courses/page.tsx

@@ -1,3 +1,4 @@
+import type { Metadata } from "next"
 import { UserX } from "lucide-react"
 import { getTranslations } from "next-intl/server"
 
@@ -5,17 +6,28 @@ import { getStudentClasses } from "@/modules/classes/data-access"
 import { getCurrentStudentUser } from "@/modules/users/data-access"
 import { StudentCoursesView } from "@/modules/student/components/student-courses-view"
 import { CourseFilters } from "@/modules/student/components/course-filters"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 import { EmptyState } from "@/shared/components/ui/empty-state"
 import { getParam, type SearchParams } from "@/shared/lib/search-params"
 
 export const dynamic = "force-dynamic"
 
+export async function generateMetadata(): Promise<Metadata> {
+  const t = await getTranslations("classes")
+  return {
+    title: `${t("metadata.studentCourses")} - Next_Edu`,
+    description: t("metadata.studentCourses"),
+  }
+}
+
 export default async function StudentCoursesPage({
   searchParams,
 }: {
   searchParams: Promise<SearchParams>
 }) {
   const t = await getTranslations("student")
+  await requirePermission(Permissions.CLASS_READ)
   const student = await getCurrentStudentUser()
   if (!student) {
     return (