feat(frontend): connect borrow flow to api

eme-frontend/lib/screens/confirmation_screen.dart

@@ -1,24 +1,28 @@
 import "package:flutter/material.dart";
 import "package:google_fonts/google_fonts.dart";
 import "../theme/ensup_colors.dart";
+import "../models/emprunt_response.dart";
 import "../models/materiel_item.dart";
 import "../widgets/ensup_top_bar.dart";
 import "../widgets/brand_corners.dart";
 
 /// Écran de succès clôturant l'emprunt : confirmation + récapitulatif.
 class ConfirmationScreen extends StatelessWidget {
-  const ConfirmationScreen({super.key, required this.item, this.note});
+  const ConfirmationScreen({super.key, required this.emprunt, this.note});
 
-  final MaterielItem item;
+  final EmpruntResponse emprunt;
   final String? note;
 
+  MaterielItem get item => emprunt.materiel;
+
   static String _deuxChiffres(int valeur) => valeur.toString().padLeft(2, "0");
 
   @override
   Widget build(BuildContext context) {
-    final now = DateTime.now();
-    final date = "${_deuxChiffres(now.day)}/${_deuxChiffres(now.month)}/${now.year}";
-    final heure = "${_deuxChiffres(now.hour)}:${_deuxChiffres(now.minute)}";
+    final dateEmprunt = emprunt.dateEmprunt;
+    final date =
+        "${_deuxChiffres(dateEmprunt.day)}/${_deuxChiffres(dateEmprunt.month)}/${dateEmprunt.year}";
+    final heure = "${_deuxChiffres(dateEmprunt.hour)}:${_deuxChiffres(dateEmprunt.minute)}";
 
     return Scaffold(
       backgroundColor: EnsupColors.soft,
@@ -181,6 +185,7 @@ class ConfirmationScreen extends StatelessWidget {
           const SizedBox(height: 10),
           _rrow("Matériel", item.nom),
           _rrow("Référence", item.reference),
+          _rrow("N° emprunt", "#${emprunt.id}"),
           _rrow("Emprunteur", "Lucas Martin"),
           _rrow("Date d'emprunt", date),
           _rrow("Heure", heure),