feat(rh): add checkbox selection and French date format to RH tables
- Add select checkbox column to all RH table heads (document, formulaire, conge, absence, salarie, rdv-annuel, recrutement)
- Implement allSelected/toggleAll for bulk selection in list views
- Format dates to DD/MM/YYYY French format using dateFormat.split.date
- Add selectedRows and toggleRow props to table row components
- Fix checkbox selection state in candidature backend hooks
Closes VSN-2161