Staff Profile Accordion/Add Fix

Fixed pages:
- /hrms/staff_form.php?id=1
- /hrms/staff_profile_update.php
- /admin/hrms/staff_form.php?id=1

Fixes:
1. Education / Experience / Research / Documents / Bank accordion sections open/close without depending on Bootstrap JS.
2. The section title/header is clickable, not only the small invisible overlay.
3. + Add button now opens the section and adds the current row values into the table preview.
4. After Add, a blank input row is appended for entering another detail.
5. Profile update form now wraps all accordion sections, so section fields are included in submit.
6. JS is PHP/version independent and safe when select2/dropify/bootstrap-select are unavailable.