fix(#131): différer rattachement enfants AM jusqu'à Sauvegarder.

Rattachement et détachement restent locaux, recalculent places_available et sont persistés avec le PATCH fiche.

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

frontend/lib/widgets/admin/common/admin_am_edit_modal.dart

@@ -53,6 +53,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
   late bool _disponible;
   late int? _placesAvailable;
   late List<ParentChildSummary> _children;
+  late Set<String> _baselineChildIds;
 
   bool _saving = false;
   bool _dirty = false;
@@ -124,6 +125,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
     _disponible = am.available ?? true;
     _placesAvailable = am.placesAvailable;
     _children = List.of(am.children);
+    _baselineChildIds = _children.map((c) => c.id).toSet();
 
     for (final c in [
       _nomCtrl,
@@ -147,7 +149,18 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
     _nomCtrl.addListener(_onNameFieldChanged);
     _prenomCtrl.addListener(_onNameFieldChanged);
     _tabCtrl.addListener(_onTabChanged);
-    _reloadChildren();
+    _fetchChildrenFromServer();
+  }
+
+  bool _childrenChanged() {
+    final current = _children.map((c) => c.id).toSet();
+    return current.length != _baselineChildIds.length ||
+        !current.containsAll(_baselineChildIds);
+  }
+
+  void _syncPlacesAfterChildrenChange() {
+    final expected = _computedPlacesAvailable();
+    if (expected != null) _placesAvailable = expected;
   }
 
   void _onTabChanged() {
@@ -288,6 +301,22 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
 
     setState(() => _saving = true);
     try {
+      if (_childrenChanged()) _syncPlacesAfterChildrenChange();
+
+      final currentIds = _children.map((c) => c.id).toSet();
+      for (final id in _baselineChildIds.difference(currentIds)) {
+        await UserService.detachEnfantFromAm(
+          amUserId: widget.assistante.user.id,
+          enfantId: id,
+        );
+      }
+      for (final id in currentIds.difference(_baselineChildIds)) {
+        await UserService.attachEnfantToAm(
+          amUserId: widget.assistante.user.id,
+          enfantId: id,
+        );
+      }
+
       await UserService.updateAmFiche(
         amUserId: widget.assistante.user.id,
         body: {
@@ -308,8 +337,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
           if (_frDateToIso(_dateAgrementCtrl.text) != null)
             'agreement_date': _frDateToIso(_dateAgrementCtrl.text),
           if (_capaciteMax() != null) 'max_children': _capaciteMax(),
-          if (_placesAvailable != widget.assistante.placesAvailable)
+          if (_placesAvailable != null) 'places_available': _placesAvailable,
-            'places_available': _placesAvailable,
           'available': _disponible,
         },
       );
@@ -317,6 +345,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
       setState(() {
         _dirty = false;
         _saving = false;
+        _baselineChildIds = currentIds;
       });
       widget.onSaved?.call();
       ScaffoldMessenger.of(context).showSnackBar(
@@ -331,7 +360,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
     }
   }
 
-  Future<void> _reloadChildren() async {
+  Future<void> _fetchChildrenFromServer() async {
     try {
       final refreshed =
           await UserService.getAssistanteMaternelle(widget.assistante.user.id);
@@ -345,7 +374,26 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
       }).toList();
 
       if (!mounted) return;
-      setState(() => _children = kids);
+      setState(() {
+        _children = kids;
+        _baselineChildIds = kids.map((c) => c.id).toSet();
+      });
+    } catch (_) {}
+  }
+
+  Future<void> _refreshChildrenDetails() async {
+    try {
+      final all = await UserService.getEnfants();
+      final byId = {for (final e in all) e.id: e};
+
+      if (!mounted) return;
+      setState(() {
+        _children = _children.map((c) {
+          final full = byId[c.id];
+          if (full != null) return ParentChildSummary.fromEnfant(full);
+          return c;
+        }).toList();
+      });
     } catch (_) {}
   }
 
@@ -357,7 +405,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
         context: context,
         builder: (ctx) => AdminChildDetailModal(
           enfant: enfant,
-          onSaved: _reloadChildren,
+          onSaved: _refreshChildrenDetails,
         ),
       );
     } catch (e) {
@@ -392,23 +440,11 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
     );
     if (confirmed != true || !mounted) return;
 
-    try {
+    setState(() {
-      await UserService.detachEnfantFromAm(
+      _children = _children.where((c) => c.id != child.id).toList();
-        amUserId: widget.assistante.user.id,
+      _syncPlacesAfterChildrenChange();
-        enfantId: child.id,
+      _dirty = true;
-      );
+    });
-      if (!mounted) return;
-      await _reloadChildren();
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Enfant détaché')),
-      );
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-    }
   }
 
   Future<void> _attachChild() async {
@@ -450,23 +486,14 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
     );
     if (selected == null || !mounted) return;
 
-    try {
+    setState(() {
-      await UserService.attachEnfantToAm(
+      _children = [
-        amUserId: widget.assistante.user.id,
+        ..._children,
-        enfantId: selected.id,
+        ParentChildSummary.fromEnfant(selected),
-      );
+      ];
-      if (!mounted) return;
+      _syncPlacesAfterChildrenChange();
-      await _reloadChildren();
+      _dirty = true;
-      if (!mounted) return;
+    });
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Enfant rattaché')),
-      );
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-    }
   }