public function absenceFormAdmin()
    {
        $userId = (int)(session()->get('user_id') ?? 0);
        if ($userId <= 0) {
            return redirect()->to('login')->with('error', 'Please log in first.');
        }

        $admin = $this->userModel->find($userId);
        $displayName = $admin ? trim(($admin['firstname'] ?? '') . ' ' . ($admin['lastname'] ?? '')) : 'Administrator';

        $semester   = (string)($this->semester   ?? '');
        $schoolYear = (string)($this->schoolYear ?? '');

        $existing = $this->staffAttendanceModel
            ->where('user_id', $userId)
            ->where('semester', $semester)
            ->where('school_year', $schoolYear)
            ->orderBy('date', 'DESC')
            ->findAll();

        return view('administrator/absence_vacation', [
            'admin_name'     => $displayName,
            'semester'       => $semester,
            'schoolYear'     => $schoolYear,
            'existing'       => $existing,
            'availableDates' => $this->allowedAbsenceDates(),
        ]);
    }

    /**
     * Handle admin absence submission (upserts staff_attendance like the teacher flow)
     */