fix(#112): afficher photos enfants en reprise + consentement cohérent

Charge existingPhotoUrl dans les cartes enfant (étapes 3 et 5) et pré-coche
le consentement photo lorsqu'une photo est déjà en base.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/lib/models/user_registration_data.dart

@@ -30,6 +30,7 @@ class ParentData {
 class ChildData {
   static const Object _unsetImage = Object();
   static const Object _unsetImageBytes = Object();
+  static const Object _unsetExistingPhotoUrl = Object();
 
   String firstName;
   String lastName;
@@ -75,7 +76,7 @@ class ChildData {
     Object? imageBytes = _unsetImageBytes,
     CardColorVertical? cardColor,
     String? repriseChildId,
-    String? existingPhotoUrl,
+    Object? existingPhotoUrl = _unsetExistingPhotoUrl,
   }) {
     return ChildData(
       firstName: firstName ?? this.firstName,
@@ -90,7 +91,9 @@ class ChildData {
           identical(imageBytes, _unsetImageBytes) ? this.imageBytes : imageBytes as Uint8List?,
       cardColor: cardColor ?? this.cardColor,
       repriseChildId: repriseChildId ?? this.repriseChildId,
-      existingPhotoUrl: existingPhotoUrl ?? this.existingPhotoUrl,
+      existingPhotoUrl: identical(existingPhotoUrl, _unsetExistingPhotoUrl)
+          ? this.existingPhotoUrl
+          : existingPhotoUrl as String?,
     );
   }
 }

frontend/lib/screens/auth/parent_register_step3_screen.dart

@@ -166,7 +166,11 @@ class _ParentRegisterStep3ScreenState extends State<ParentRegisterStep3Screen> {
               if (await f.exists()) file = f;
             } catch (_) {}
           }
-          final updatedChild = oldChild.copyWith(imageBytes: bytes, imageFile: file);
+          final updatedChild = oldChild.copyWith(
+            imageBytes: bytes,
+            imageFile: file,
+            existingPhotoUrl: null,
+          );
           registrationData.updateChild(childIndex, updatedChild);
         }
       }
@@ -306,7 +310,7 @@ class _ParentRegisterStep3ScreenState extends State<ParentRegisterStep3Screen> {
                     onClearImage: () => setState(() {
                       final c = registrationData.children[index];
                       registrationData.updateChild(
-                          index, c.copyWith(imageFile: null, imageBytes: null));
+                          index, c.copyWith(imageFile: null, imageBytes: null, existingPhotoUrl: null));
                     }),
                     onDateSelect: () => _selectDate(context, index, registrationData),
                     onFirstNameChanged: (value) => setState(() {
@@ -414,7 +418,7 @@ class _ParentRegisterStep3ScreenState extends State<ParentRegisterStep3Screen> {
                                   onClearImage: () => setState(() {
                                     final c = registrationData.children[index];
                                     registrationData.updateChild(
-                                        index, c.copyWith(imageFile: null, imageBytes: null));
+                                        index, c.copyWith(imageFile: null, imageBytes: null, existingPhotoUrl: null));
                                   }),
                                   onDateSelect: () => _selectDate(context, index, registrationData),
                                   onFirstNameChanged: (value) => setState(() {

frontend/lib/utils/reprise_mapper.dart

@@ -37,12 +37,15 @@ class RepriseMapper {
         ? isoToDdMmYyyy(e.dueDate)
         : isoToDdMmYyyy(e.birthDate);
     final photo = e.photoUrl?.trim();
+    final hasPhoto = photo != null && photo.isNotEmpty;
     return ChildData(
       firstName: e.firstName ?? '',
       lastName: e.lastName ?? '',
       dob: dob,
       genre: e.gender ?? '',
-      photoConsent: e.consentPhoto,
+      // Inscription initiale exigeait la coche pour envoyer la photo ; le back
+      // ne persistait pas toujours consent_photo — on pré-coche si photo en base.
+      photoConsent: e.consentPhoto || hasPhoto,
       multipleBirth: e.estMultiple,
       isUnbornChild: isUnborn,
       cardColor: _childCardColors[index % _childCardColors.length],

frontend/lib/widgets/child_card_widget.dart

@@ -1,4 +1,5 @@
 import 'dart:math' as math;
+import 'dart:io';
 
 import 'package:flutter/material.dart';
 import 'package:google_fonts/google_fonts.dart';
@@ -20,7 +21,7 @@ bool _hasChildPhoto(ChildData c) {
   return registrationPhotoSlotHasImage(
     imageBytes: c.imageBytes,
     imageFile: c.imageFile,
-    imagePathOrAsset: null,
+    imagePathOrAsset: c.existingPhotoUrl,
   );
 }
 
@@ -33,6 +34,20 @@ Widget _buildChildPhotoImage(ChildData c, {required BoxFit fit}) {
   if (f != null) {
     return kIsWeb ? Image.network(f.path, fit: fit) : Image.file(f, fit: fit);
   }
+  final url = c.existingPhotoUrl?.trim();
+  if (url != null && url.isNotEmpty) {
+    if (url.startsWith('http://') || url.startsWith('https://')) {
+      return Image.network(url, fit: fit);
+    }
+    if (!kIsWeb) {
+      try {
+        final file = File(url);
+        if (file.existsSync()) {
+          return Image.file(file, fit: fit);
+        }
+      } catch (_) {}
+    }
+  }
   return Image.asset('assets/images/photo.png', fit: BoxFit.contain);
 }
 
@@ -221,6 +236,7 @@ class _ChildCardWidgetState extends State<ChildCardWidget> {
                 scaleFactor: scaleFactor,
                 imageBytes: widget.childData.imageBytes,
                 imageFile: widget.childData.imageFile,
+                imagePathOrAsset: widget.childData.existingPhotoUrl,
                 onTapPick: !config.isReadonly ? widget.onPickImage : null,
                 onClear: !config.isReadonly ? widget.onClearImage : null,
                 baseShadowColor: baseCardColorForShadow,

frontend/lib/widgets/registration_photo_slot.dart

@@ -71,6 +71,9 @@ class RegistrationPhotoSlot extends StatelessWidget {
       if (p.startsWith('assets/')) {
         return Image.asset(p, fit: fit);
       }
+      if (p.startsWith('http://') || p.startsWith('https://')) {
+        return Image.network(p, fit: fit);
+      }
       if (!kIsWeb) {
         try {
           final file = File(p);