VSN-2853/ isolate tab session storage by type and move documents to dedicated tab

• Fix shared session storage keys for tabs: candidature chauffeur/sédentaire and établissement scolaire/professionnel were sharing the same sessionStorage key, causing tabs opened in one context. Fixed by introducing sessionScope per type in useTabsManager, and passing distinct scopes (candidature_chauffeur, candidature_sedentaire, establishment_scolaire, establishment_professionnel) from their respective hooks/views.
  • Move documents section to dedicated tab: in the establishment form (both scolaire and professionnel)