feat(frontend): connect borrow flow to api

eme-frontend/lib/screens/checklist_depart_screen.dart

@@ -2,6 +2,7 @@ import "package:flutter/material.dart";
 import "package:google_fonts/google_fonts.dart";
 import "../theme/ensup_colors.dart";
 import "../models/materiel_item.dart";
+import "../services/emprunt_service.dart";
 import "../widgets/ensup_top_bar.dart";
 import "../widgets/brand_corners.dart";
 import "../widgets/etat_checklist.dart";
@@ -19,27 +20,79 @@ class ChecklistDepartScreen extends StatefulWidget {
 }
 
 class _ChecklistDepartScreenState extends State<ChecklistDepartScreen> {
+  late final List<String> _elements = widget.item.accessoires.isEmpty
+      ? <String>[widget.item.nom]
+      : widget.item.accessoires;
   late final List<EtatChecklist> _etats = List<EtatChecklist>.filled(
-    widget.item.accessoires.length,
+    _elements.length,
     EtatChecklist.present,
   );
+  final TextEditingController _commentaireController = TextEditingController();
+  bool _envoiEnCours = false;
+
+  @override
+  void dispose() {
+    _commentaireController.dispose();
+    super.dispose();
+  }
+
+  Future<void> _valider() async {
+    setState(() => _envoiEnCours = true);
 
-  void _valider() {
     final anomalies = <String>[];
     for (var i = 0; i < _etats.length; i++) {
       if (_etats[i] == EtatChecklist.absent) {
-        anomalies.add("${widget.item.accessoires[i]} absent au départ");
+        anomalies.add("${_elements[i]} absent au départ");
       } else if (_etats[i] == EtatChecklist.deteriore) {
-        anomalies.add("${widget.item.accessoires[i]} détérioré au départ");
+        anomalies.add("${_elements[i]} détérioré au départ");
       }
     }
     final note = anomalies.isEmpty ? null : anomalies.join(", ");
 
-    Navigator.of(context).push(
-      MaterialPageRoute(
-        builder: (_) => ConfirmationScreen(item: widget.item, note: note),
-      ),
-    );
+    try {
+      final emprunt = await EmpruntService.creerEmprunt(
+        materielId: widget.item.id,
+        commentaireDepart: _commentaireController.text,
+        elements: _elements.asMap().entries.map((entry) {
+          return {
+            "nomElement": entry.value,
+            "etat": _etatApi(_etats[entry.key]),
+            "quantiteConstatee": _etats[entry.key] == EtatChecklist.absent ? 0 : 1,
+          };
+        }).toList(),
+      );
+
+      if (!mounted) {
+        return;
+      }
+      Navigator.of(context).push(
+        MaterialPageRoute(
+          builder: (_) => ConfirmationScreen(emprunt: emprunt, note: note),
+        ),
+      );
+    } catch (error) {
+      if (!mounted) {
+        return;
+      }
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text(error.toString())),
+      );
+    } finally {
+      if (mounted) {
+        setState(() => _envoiEnCours = false);
+      }
+    }
+  }
+
+  String _etatApi(EtatChecklist etat) {
+    switch (etat) {
+      case EtatChecklist.present:
+        return "PRESENT";
+      case EtatChecklist.absent:
+        return "ABSENT";
+      case EtatChecklist.deteriore:
+        return "DETERIORE";
+    }
   }
 
   @override
@@ -141,7 +194,7 @@ class _ChecklistDepartScreenState extends State<ChecklistDepartScreen> {
         ),
         const SizedBox(height: 16),
         ChecklistTableau(
-          accessoires: widget.item.accessoires,
+          accessoires: _elements,
           etats: _etats,
           onChanged: (index, etat) => setState(() => _etats[index] = etat),
         ),
@@ -161,15 +214,23 @@ class _ChecklistDepartScreenState extends State<ChecklistDepartScreen> {
               "endommagé pour éviter tout litige au retour.",
         ),
         const SizedBox(height: 14),
-        const ChecklistCommentaire(),
+        ChecklistCommentaire(controller: _commentaireController),
         const SizedBox(height: 14),
         SizedBox(
           width: double.infinity,
           child: FilledButton.icon(
-            onPressed: _valider,
-            icon: const Icon(Icons.check, size: 18),
+            onPressed: _envoiEnCours ? null : _valider,
+            icon: _envoiEnCours
+                ? const SizedBox(
+                    width: 18,
+                    height: 18,
+                    child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
+                  )
+                : const Icon(Icons.check, size: 18),
             label: Text(
-              "Valider la checklist et confirmer l'emprunt",
+              _envoiEnCours
+                  ? "Enregistrement..."
+                  : "Valider la checklist et confirmer l'emprunt",
               textAlign: TextAlign.center,
               style: GoogleFonts.darkerGrotesque(fontWeight: FontWeight.w700, fontSize: 15),
             ),