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/page.tsx

@@ -20,6 +20,8 @@ import { getTeacherClasses } from "@/modules/classes/data-access"
 import { PenTool, PlusCircle, AlertCircle } from "lucide-react"
 import { getTeacherIdForMutations } from "@/modules/classes/data-access"
 import { getTranslations } from "next-intl/server"
+import { requirePermission } from "@/shared/lib/auth-guard"
+import { Permissions } from "@/shared/types/permissions"
 
 export const dynamic = "force-dynamic"
 
@@ -29,6 +31,7 @@ export default async function AssignmentsPage({ searchParams }: { searchParams:
   const t = await getTranslations("examHomework")
   const sp = await searchParams
   const rawClassId = getParam(sp, "classId")
+  const ctx = await requirePermission(Permissions.HOMEWORK_CREATE)
   const creatorId = await getTeacherIdForMutations()
 
   // Only fetch classes list when a class filter is active — needed to resolve
@@ -36,7 +39,7 @@ export default async function AssignmentsPage({ searchParams }: { searchParams:
   // avoid an unnecessary DB round-trip.
   const filteredClassId = rawClassId && rawClassId !== "all" ? rawClassId : null
   const [assignments, classes] = await Promise.all([
-    getHomeworkAssignments({ creatorId, classId: filteredClassId ?? undefined }),
+    getHomeworkAssignments({ creatorId, classId: filteredClassId ?? undefined, scope: ctx.dataScope }),
     filteredClassId ? getTeacherClasses() : Promise.resolve([]),
   ])
   const hasAssignments = assignments.length > 0