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
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