feat: Refactoring de la fonction de création de profil sur guardian côté

FRONT

Front-End/src/components/Sidebar.js

@@ -44,7 +44,7 @@ function Sidebar({ establishments, currentPage, items, onCloseMobile, onEstablis
     <div className="w-64 bg-white border-r h-full border-gray-200 py-6 px-4">
       <div className="flex items-center mb-8 px-2">
         <select
-          value={selectedEstablishmentId}
+          value={selectedEstablishmentId || ''}
           onChange={handleEstablishmentChange}
           className="form-select block w-full mt-1"
         >