fix(#138): différer le rattachement AM de la fiche enfant au Sauvegarder.

Attach/détach AM restent locaux comme sur la fiche AM ; la sync API
n'a lieu qu'à l'enregistrement, avec rechargement du statut au retour
de la fiche AM.

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

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

@@ -42,10 +42,11 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
   bool _dirty = false;
   bool _saving = false;
   bool _deleting = false;
-  bool _placementBusy = false;
   bool _loadingAm = true;
   String? _currentUserRole;
   AssistanteMaternelleModel? _linkedAm;
+  /// AM rattachée au chargement (pour sync différé au Sauvegarder).
+  String? _baselineAmUserId;
 
   static const double _modalWidth = 930;
   static const double _mainRowHeight = 380;
@@ -74,7 +75,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
   bool get _canDelete =>
       (_currentUserRole ?? '').toLowerCase() == 'super_admin';
 
-  bool get _busy => _saving || _deleting || _placementBusy;
+  bool get _busy => _saving || _deleting;
 
   @override
   void initState() {
@@ -113,11 +114,15 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       if (!mounted) return;
       setState(() {
         _linkedAm = am;
+        _baselineAmUserId = am?.user.id;
         _loadingAm = false;
       });
     } catch (_) {
       if (!mounted) return;
-      setState(() => _loadingAm = false);
+      setState(() {
+        _baselineAmUserId = null;
+        _loadingAm = false;
+      });
     }
   }
 
@@ -248,6 +253,8 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
     if (!_dirty) return;
     setState(() => _saving = true);
     try {
+      await _syncAmPlacement();
+
       await UserService.updateEnfant(
         enfantId: widget.enfant.id,
         body: {
@@ -268,6 +275,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       setState(() {
         _dirty = false;
         _saving = false;
+        _baselineAmUserId = _linkedAm?.user.id;
       });
       widget.onSaved?.call();
       ScaffoldMessenger.of(context).showSnackBar(
@@ -282,6 +290,25 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
     }
   }
 
+  /// Applique rattachement / détachement AM (différé jusqu'au Sauvegarder).
+  Future<void> _syncAmPlacement() async {
+    final baselineId = _baselineAmUserId;
+    final currentId = _linkedAm?.user.id;
+
+    if (baselineId != null && baselineId != currentId) {
+      await UserService.detachEnfantFromAm(
+        amUserId: baselineId,
+        enfantId: widget.enfant.id,
+      );
+    }
+    if (currentId != null && currentId != baselineId) {
+      await UserService.attachEnfantToAm(
+        amUserId: currentId,
+        enfantId: widget.enfant.id,
+      );
+    }
+  }
+
   Future<void> _delete() async {
     if (!_canDelete || _deleting) return;
 
@@ -338,14 +365,39 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       context: context,
       builder: (ctx) => AdminAmEditModal(
         assistante: am,
-        onSaved: () {
+        onSaved: () async {
-          _loadLinkedAm();
+          await _reloadPlacementFromServer();
           widget.onSaved?.call();
         },
       ),
     );
   }
 
+  /// Recharge AM + statut après une modale externe (ex. fiche AM).
+  Future<void> _reloadPlacementFromServer() async {
+    try {
+      final results = await Future.wait([
+        UserService.findAmForEnfant(widget.enfant.id),
+        UserService.getEnfant(widget.enfant.id),
+      ]);
+      if (!mounted) return;
+      final am = results[0] as AssistanteMaternelleModel?;
+      final enfant = results[1] as EnfantAdminModel;
+      setState(() {
+        _linkedAm = am;
+        _baselineAmUserId = am?.user.id;
+        _status = normalizeEnfantStatus(enfant.status);
+        if (!enfantStatusValues.contains(_status)) {
+          _status = 'sans_garde';
+        }
+        _coerceGenderForStatus();
+      });
+    } catch (_) {
+      if (!mounted) return;
+      await _loadLinkedAm();
+    }
+  }
+
   Future<void> _attachAm() async {
     List<AssistanteMaternelleModel> all;
     try {
@@ -368,8 +420,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       return;
     }
 
-    final candidates = all;
+    if (all.isEmpty) {
-    if (candidates.isEmpty) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(content: Text('Aucune assistante maternelle disponible')),
@@ -382,7 +433,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       context: context,
       builder: (ctx) => SimpleDialog(
         title: const Text('Choisir une assistante maternelle'),
-        children: candidates
+        children: all
             .map(
               (am) => SimpleDialogOption(
                 onPressed: () => Navigator.pop(ctx, am),
@@ -394,41 +445,13 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
     );
     if (selected == null || !mounted) return;
 
-    setState(() => _placementBusy = true);
-    try {
-      // Sans garde : éventuel lien résiduel à clôturer avant rattachement.
-      final previousAm = _linkedAm;
-      if (previousAm != null) {
-        await UserService.detachEnfantFromAm(
-          amUserId: previousAm.user.id,
-          enfantId: widget.enfant.id,
-        );
-      }
-      await UserService.attachEnfantToAm(
-        amUserId: selected.user.id,
-        enfantId: widget.enfant.id,
-      );
-      if (!mounted) return;
     setState(() {
-        // Le back passe déjà sans_garde → garde à l'attach ; on aligne l'UI.
+      _linkedAm = selected;
       if (_status == 'sans_garde') {
         _status = 'garde';
       }
+      _dirty = true;
     });
-      await _loadLinkedAm();
-      widget.onSaved?.call();
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Assistante maternelle rattachée')),
-      );
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-    } finally {
-      if (mounted) setState(() => _placementBusy = false);
-    }
   }
 
   Future<void> _detachAm() async {
@@ -440,7 +463,8 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
       builder: (ctx) => AlertDialog(
         title: const Text('Détacher l\'assistante'),
         content: Text(
-          'Retirer ${am.user.fullName} de la garde de cet enfant ?',
+          'Retirer ${am.user.fullName} de la garde de cet enfant ?\n'
+          '(Effectif après Sauvegarder.)',
         ),
         actions: [
           TextButton(
@@ -457,57 +481,22 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
     );
     if (confirmed != true || !mounted) return;
 
-    setState(() => _placementBusy = true);
-    try {
-      await UserService.detachEnfantFromAm(
-        amUserId: am.user.id,
-        enfantId: widget.enfant.id,
-      );
-      if (!mounted) return;
     setState(() {
-        // Le back repasse en sans_garde sauf a_naitre / scolarise.
+      _linkedAm = null;
       if (_status != 'a_naitre' && _status != 'scolarise') {
         _status = 'sans_garde';
       }
-        _linkedAm = null;
+      _dirty = true;
     });
-      widget.onSaved?.call();
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Assistante maternelle détachée')),
-      );
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-    } finally {
-      if (mounted) setState(() => _placementBusy = false);
-    }
   }
 
-  /// Passe en « Sans garde » : cadre vide + détachement AM si besoin.
+  /// Passe en « Sans garde » : cadre vide local (détachement au Sauvegarder).
-  Future<void> _applySansGardeStatus() async {
+  void _applySansGardeStatus() {
-    final am = _linkedAm;
+    if (_linkedAm == null) return;
-    if (am == null) return;
+    setState(() {
-
+      _linkedAm = null;
-    setState(() => _placementBusy = true);
+      _dirty = true;
-    try {
+    });
-      await UserService.detachEnfantFromAm(
-        amUserId: am.user.id,
-        enfantId: widget.enfant.id,
-      );
-      if (!mounted) return;
-      setState(() => _linkedAm = null);
-      widget.onSaved?.call();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-    } finally {
-      if (mounted) setState(() => _placementBusy = false);
-    }
   }
 
   InputDecoration _inputDecoration({String? hint}) {
@@ -952,7 +941,7 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
   Widget _placementSection() {
     if (!_showsAmPlacement) return _scolariseCard();
 
-    if (_loadingAm || _placementBusy) {
+    if (_loadingAm) {
       return SizedBox(
         height: _placementHeight,
         width: double.infinity,