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/[classId]/error.tsx

@@ -0,0 +1,13 @@
+"use client"
+
+import { ErrorState } from "@/shared/components/error-state"
+
+export default function StudentClassDetailError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  return <ErrorState error={error} reset={reset} namespace="student" />
+}

src/app/(dashboard)/student/learning/courses/[classId]/page.tsx

@@ -1,3 +1,4 @@
+import type { Metadata } from "next"
 import Link from "next/link"
 import { notFound } from "next/navigation"
 import {
@@ -14,6 +15,8 @@ import { getTranslations } from "next-intl/server"
 
 import { getStudentClassById, getStudentSchedule } from "@/modules/classes/data-access"
 import { getCurrentStudentUser } from "@/modules/users/data-access"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
 import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
@@ -21,6 +24,14 @@ import { EmptyState } from "@/shared/components/ui/empty-state"
 
 export const dynamic = "force-dynamic"
 
+export async function generateMetadata(): Promise<Metadata> {
+  const t = await getTranslations("classes")
+  return {
+    title: `${t("metadata.studentClassDetail")} - Next_Edu`,
+    description: t("metadata.studentClassDetail"),
+  }
+}
+
 const WEEKDAY_KEYS: Record<number, string> = {
   1: "mon",
   2: "tue",
@@ -37,6 +48,7 @@ export default async function StudentClassDetailPage({
   params: Promise<{ classId: string }>
 }) {
   const { classId } = await params
+  await requirePermission(Permissions.CLASS_READ)
   const student = await getCurrentStudentUser()
   if (!student) return notFound()
 

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

@@ -0,0 +1,13 @@
+"use client"
+
+import { ErrorState } from "@/shared/components/error-state"
+
+export default function StudentCoursesError({
+  error,
+  reset,
+}: {
+  error: Error & { digest?: string }
+  reset: () => void
+}) {
+  return <ErrorState error={error} reset={reset} namespace="student" />
+}

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 (