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)/admin/curriculum-map/error.tsx

@@ -0,0 +1,20 @@
+"use client";
+
+import { useTranslations } from "next-intl";
+import { Map } from "lucide-react";
+import { EmptyState } from "@/shared/components/ui/empty-state";
+
+export default function CurriculumMapError() {
+  const t = useTranslations("lessonPreparation");
+  return (
+    <div className="p-8">
+      <EmptyState
+        icon={Map}
+        title={t("analytics.loadFailed")}
+        description={t("error.loadFailedDesc")}
+        action={{ label: t("error.retry"), onClick: () => window.location.reload() }}
+        className="border-none shadow-none"
+      />
+    </div>
+  );
+}