feat(#146–#149): sélection enfant/AM, capacité max et case libre.

Modales de rattachement partagées, filtre Libre/Sans garde, recalcul des places à l'attach, désactivation si capacité pleine, clic sur case libre.

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

frontend/lib/services/user_service.dart

@@ -8,6 +8,7 @@ import 'package:p_tits_pas/models/pending_family.dart';
 import 'package:p_tits_pas/models/dossier_unifie.dart';
 import 'package:p_tits_pas/services/api/api_config.dart';
 import 'package:p_tits_pas/services/api/tokenService.dart';
+import 'package:p_tits_pas/utils/am_vigilance.dart';
 
 class DocumentActifInfo {
   final String id;
@@ -688,7 +689,24 @@ class UserService {
     if (response.statusCode != 200 && response.statusCode != 201) {
       throw Exception(_extractErrorMessage(response.body, 'Erreur rattachement enfant'));
     }
-    return _amModelFromBody(response.body);
+    final am = _amModelFromBody(response.body);
+    // Recalcule toujours places_available (capacité − enfants) après attachement.
+    return syncAmPlacesAvailable(am);
+  }
+
+  /// Aligne `places_available` sur capacité − enfants rattachés.
+  static Future<AssistanteMaternelleModel> syncAmPlacesAvailable(
+    AssistanteMaternelleModel am,
+  ) async {
+    final expected = amExpectedPlacesAvailable(
+      maxChildren: am.maxChildren,
+      childrenCount: am.children.length,
+    );
+    if (expected == null || am.placesAvailable == expected) return am;
+    return updateAmFiche(
+      amUserId: am.user.id,
+      body: {'places_available': expected},
+    );
   }
 
   static Future<AssistanteMaternelleModel> detachEnfantFromAm({

frontend/lib/utils/am_vigilance.dart

@@ -9,6 +9,18 @@ int? amExpectedPlacesAvailable({
   return (maxChildren - childrenCount).clamp(0, maxChildren);
 }
 
+/// True s'il reste au moins une place d'accueil (capacité − enfants).
+bool amHasFreePlace(AssistanteMaternelleModel am) {
+  final expected = amExpectedPlacesAvailable(
+    maxChildren: am.maxChildren,
+    childrenCount: am.children.length,
+  );
+  if (expected != null) return expected > 0;
+  final places = am.placesAvailable;
+  if (places != null) return places > 0;
+  return true;
+}
+
 /// True si la valeur déclarée par l'AM ne correspond pas au calcul métier.
 bool amHasPlacesInconsistency({
   required int? maxChildren,

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

@@ -20,6 +20,8 @@ class AdminAmChildrenCapacityGrid extends StatelessWidget {
   final int capacity;
   final void Function(ParentChildSummary child) onOpen;
   final void Function(ParentChildSummary child) onDetach;
+  /// Clic sur une case libre → même flux que « Rattacher un enfant » (#149).
+  final VoidCallback? onAttachEmpty;
 
   const AdminAmChildrenCapacityGrid({
     super.key,
@@ -27,6 +29,7 @@ class AdminAmChildrenCapacityGrid extends StatelessWidget {
     required this.capacity,
     required this.onOpen,
     required this.onDetach,
+    this.onAttachEmpty,
   });
 
   @override
@@ -78,7 +81,7 @@ class AdminAmChildrenCapacityGrid extends StatelessWidget {
       );
     }
     if (index < maxSlots) {
-      return const _EmptySlot();
+      return _EmptySlot(onTap: onAttachEmpty);
     }
     return const _UnavailableSlot();
   }
@@ -129,18 +132,52 @@ class _UnavailableSlot extends StatelessWidget {
   }
 }
 
-class _EmptySlot extends StatelessWidget {
-  const _EmptySlot();
+class _EmptySlot extends StatefulWidget {
+  final VoidCallback? onTap;
+
+  const _EmptySlot({this.onTap});
+
+  @override
+  State<_EmptySlot> createState() => _EmptySlotState();
+}
+
+class _EmptySlotState extends State<_EmptySlot> {
+  bool _hovered = false;
 
   @override
   Widget build(BuildContext context) {
-    return _SlotShell(
-      backgroundColor: Colors.grey.shade50,
-      borderColor: Colors.grey.shade300,
+    final clickable = widget.onTap != null;
+    return MouseRegion(
+      onEnter: clickable ? (_) => setState(() => _hovered = true) : null,
+      onExit: clickable ? (_) => setState(() => _hovered = false) : null,
+      cursor: clickable ? SystemMouseCursors.click : MouseCursor.defer,
+      child: Material(
+        color: Colors.transparent,
+        borderRadius: BorderRadius.circular(8),
+        child: InkWell(
+          onTap: widget.onTap,
+          borderRadius: BorderRadius.circular(8),
+          hoverColor: const Color(0x149CC5C0),
+          child: _SlotShell(
+            backgroundColor: _hovered
+                ? const Color(0xFFF3F0FA)
+                : Colors.grey.shade50,
+            borderColor: _hovered
+                ? const Color(0xFFB8A4D4)
+                : Colors.grey.shade300,
             child: Center(
               child: Text(
                 'Place libre',
-          style: TextStyle(fontSize: 12, color: Colors.grey.shade500),
+                style: TextStyle(
+                  fontSize: 12,
+                  color: _hovered
+                      ? const Color(0xFF6B3FA0)
+                      : Colors.grey.shade500,
+                  fontWeight: _hovered ? FontWeight.w600 : FontWeight.w400,
+                ),
+              ),
+            ),
+          ),
         ),
       ),
     );

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

@@ -1,7 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:p_tits_pas/models/assistante_maternelle_model.dart';
-import 'package:p_tits_pas/models/enfant_admin_model.dart';
 import 'package:p_tits_pas/models/parent_child_summary.dart';
 import 'package:p_tits_pas/utils/am_vigilance.dart';
 import 'package:p_tits_pas/utils/date_display_utils.dart';
@@ -11,6 +10,7 @@ import 'package:p_tits_pas/services/user_service.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_am_children_capacity_grid.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_am_photo_frame.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_child_detail_modal.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_select_enfant_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_status_capsule.dart';
 import 'package:p_tits_pas/widgets/admin/common/validation_detail_section.dart';
 import 'package:p_tits_pas/widgets/common/identity_block.dart';
@@ -55,6 +55,10 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
   late List<ParentChildSummary> _children;
   late Set<String> _baselineChildIds;
 
+  /// Enfants ajoutés localement qui étaient déjà chez une autre AM
+  /// (enfantId → amUserId d'origine). Au save : détacher puis rattacher.
+  final Map<String, String> _transferFromAmIds = {};
+
   bool _saving = false;
   bool _dirty = false;
 
@@ -234,6 +238,13 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
 
   int? _capaciteMax() => _parseIntField(_capaciteCtrl);
 
+  /// True si plus aucune place d'accueil (enfants ≥ capacité max).
+  bool get _capacityFull {
+    final max = _capaciteMax();
+    if (max == null) return false;
+    return _children.length >= max;
+  }
+
   int? _computedPlacesAvailable() => amExpectedPlacesAvailable(
         maxChildren: _capaciteMax(),
         childrenCount: _children.length,
@@ -311,6 +322,17 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
         );
       }
       for (final id in currentIds.difference(_baselineChildIds)) {
+        // Transfert : détacher l'ancienne AM sans recalculer ses places
+        // (le ! de vigilance apparaît côté liste AM).
+        final previousAmId = _transferFromAmIds[id] ??
+            (await UserService.findAmForEnfant(id))?.user.id;
+        if (previousAmId != null &&
+            previousAmId != widget.assistante.user.id) {
+          await UserService.detachEnfantFromAm(
+            amUserId: previousAmId,
+            enfantId: id,
+          );
+        }
         await UserService.attachEnfantToAm(
           amUserId: widget.assistante.user.id,
           enfantId: id,
@@ -346,6 +368,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
         _dirty = false;
         _saving = false;
         _baselineChildIds = currentIds;
+        _transferFromAmIds.clear();
       });
       widget.onSaved?.call();
       ScaffoldMessenger.of(context).showSnackBar(
@@ -377,6 +400,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
       setState(() {
         _children = kids;
         _baselineChildIds = kids.map((c) => c.id).toSet();
+        _transferFromAmIds.clear();
       });
     } catch (_) {}
   }
@@ -442,55 +466,75 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
 
     setState(() {
       _children = _children.where((c) => c.id != child.id).toList();
+      _transferFromAmIds.remove(child.id);
       _syncPlacesAfterChildrenChange();
       _dirty = true;
     });
   }
 
   Future<void> _attachChild() async {
-    List<EnfantAdminModel> all;
-    try {
-      all = await UserService.getEnfants();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-      return;
-    }
-
-    final linkedIds = _children.map((c) => c.id).toSet();
-    final candidates = all.where((e) => !linkedIds.contains(e.id)).toList();
-    if (candidates.isEmpty) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Aucun enfant disponible à rattacher')),
-      );
-      return;
-    }
-
-    if (!mounted) return;
-    final selected = await showDialog<EnfantAdminModel>(
-      context: context,
-      builder: (ctx) => SimpleDialog(
-        title: const Text('Rattacher un enfant'),
-        children: candidates
-            .map(
-              (e) => SimpleDialogOption(
-                onPressed: () => Navigator.pop(ctx, e),
-                child: Text(e.fullName),
-              ),
-            )
-            .toList(),
-      ),
+    if (_capacityFull || !mounted) return;
+    final selected = await AdminSelectEnfantModal.show(
+      context,
+      excludeIds: _children.map((c) => c.id).toSet(),
+      title: 'Rattacher un enfant',
+      showSansGardeFilter: true,
     );
     if (selected == null || !mounted) return;
 
+    AssistanteMaternelleModel? previousAm;
+    try {
+      previousAm = await UserService.findAmForEnfant(selected.id);
+    } catch (_) {
+      previousAm = null;
+    }
+    if (!mounted) return;
+
+    final previousAmId = previousAm?.user.id;
+    final isTransfer = previousAmId != null &&
+        previousAmId != widget.assistante.user.id;
+
+    if (isTransfer) {
+      final amName = previousAm!.user.fullName.trim().isNotEmpty
+          ? previousAm.user.fullName.trim()
+          : 'une autre assistante maternelle';
+      final gardeLabel =
+          (selected.gender ?? '').trim().toUpperCase() == 'F'
+              ? 'déjà gardée'
+              : 'déjà gardé';
+      final confirmed = await showDialog<bool>(
+        context: context,
+        builder: (ctx) => AlertDialog(
+          title: const Text('Changer d\'affectation'),
+          content: Text(
+            '${selected.fullName} est $gardeLabel par $amName.\n\n'
+            'Confirmer le transfert vers cette assistante ? '
+            'L\'enfant sera détaché de $amName.',
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(ctx, false),
+              child: const Text('Annuler'),
+            ),
+            ElevatedButton(
+              onPressed: () => Navigator.pop(ctx, true),
+              style: ValidationModalTheme.primaryElevatedStyle,
+              child: const Text('Confirmer'),
+            ),
+          ],
+        ),
+      );
+      if (confirmed != true || !mounted) return;
+    }
+
     setState(() {
       _children = [
         ..._children,
         ParentChildSummary.fromEnfant(selected),
       ];
+      if (isTransfer) {
+        _transferFromAmIds[selected.id] = previousAmId!;
+      }
       _syncPlacesAfterChildrenChange();
       _dirty = true;
     });
@@ -701,6 +745,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
           capacity: capacity,
           onOpen: _openChild,
           onDetach: _detachChild,
+          onAttachEmpty: _capacityFull ? null : _attachChild,
         ),
       ],
     );
@@ -708,6 +753,7 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
 
   Widget _buildFooter() {
     final isChildrenTab = _tabCtrl.index == 2;
+    final canAttachChild = !_saving && !_capacityFull;
     return Row(
       children: [
         TextButton(
@@ -716,11 +762,16 @@ class _AdminAmEditModalState extends State<AdminAmEditModal>
         ),
         const Spacer(),
         if (isChildrenTab)
-          TextButton.icon(
-            onPressed: _attachChild,
+          Tooltip(
+            message: _capacityFull
+                ? 'Capacité maximale atteinte'
+                : 'Rattacher un enfant',
+            child: TextButton.icon(
+              onPressed: canAttachChild ? _attachChild : null,
               icon: const Icon(Icons.link, size: 18),
               label: const Text('Rattacher un enfant'),
             ),
+          ),
         if (isChildrenTab) const SizedBox(width: 12),
         ElevatedButton(
           style: ValidationModalTheme.primaryElevatedStyle,

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

@@ -9,6 +9,7 @@ import 'package:p_tits_pas/utils/enfant_status_utils.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_am_edit_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_am_photo_frame.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_parent_edit_modal.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_select_am_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/validation_detail_section.dart';
 import 'package:p_tits_pas/widgets/admin/validation_modal_theme.dart';
 import 'package:p_tits_pas/widgets/common/auth_network_image.dart';
@@ -399,49 +400,25 @@ class _AdminChildDetailModalState extends State<AdminChildDetailModal> {
   }
 
   Future<void> _attachAm() async {
-    List<AssistanteMaternelleModel> all;
-    try {
-      all = await UserService.getAssistantesMaternelles();
-    } catch (e) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-      return;
-    }
-
     if (_linkedAm != null && !_isSansGarde) {
       if (!mounted) return;
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(
-          content: Text('Détachez l\'assistante actuelle avant d\'en choisir une autre'),
+          content: Text(
+            'Détachez l\'assistante actuelle avant d\'en choisir une autre',
+          ),
         ),
       );
       return;
     }
 
-    if (all.isEmpty) {
     if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Aucune assistante maternelle disponible')),
-      );
-      return;
-    }
-
-    if (!mounted) return;
-    final selected = await showDialog<AssistanteMaternelleModel>(
-      context: context,
-      builder: (ctx) => SimpleDialog(
-        title: const Text('Choisir une assistante maternelle'),
-        children: all
-            .map(
-              (am) => SimpleDialogOption(
-                onPressed: () => Navigator.pop(ctx, am),
-                child: Text(am.user.fullName),
-              ),
-            )
-            .toList(),
-      ),
+    final selected = await AdminSelectAmModal.show(
+      context,
+      excludeIds: {
+        if (_linkedAm != null) _linkedAm!.user.id,
+      },
+      title: 'Choisir une assistante maternelle',
     );
     if (selected == null || !mounted) return;
 

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

@@ -34,6 +34,8 @@ class AdminEnfantUserCard extends StatelessWidget {
   final List<String> subtitleLines;
   final List<Widget> actions;
   final VoidCallback? onCardTap;
+  final EdgeInsetsGeometry? margin;
+  final EdgeInsetsGeometry? contentPadding;
 
   const AdminEnfantUserCard({
     super.key,
@@ -42,6 +44,8 @@ class AdminEnfantUserCard extends StatelessWidget {
     required this.subtitleLines,
     this.actions = const [],
     this.onCardTap,
+    this.margin,
+    this.contentPadding,
   });
 
   factory AdminEnfantUserCard.fromEnfant(
@@ -49,6 +53,8 @@ class AdminEnfantUserCard extends StatelessWidget {
     List<String> extraSubtitleLines = const [],
     List<Widget> actions = const [],
     VoidCallback? onCardTap,
+    EdgeInsetsGeometry? margin,
+    EdgeInsetsGeometry? contentPadding,
   }) {
     final parents = enfant.parentLinks
         .map((l) => l.parentName ?? 'Parent')
@@ -68,6 +74,8 @@ class AdminEnfantUserCard extends StatelessWidget {
       ),
       actions: actions,
       onCardTap: onCardTap,
+      margin: margin,
+      contentPadding: contentPadding,
     );
   }
 
@@ -76,6 +84,8 @@ class AdminEnfantUserCard extends StatelessWidget {
     List<String> extraSubtitleLines = const [],
     List<Widget> actions = const [],
     VoidCallback? onCardTap,
+    EdgeInsetsGeometry? margin,
+    EdgeInsetsGeometry? contentPadding,
   }) {
     return AdminEnfantUserCard(
       title: child.fullName,
@@ -88,6 +98,8 @@ class AdminEnfantUserCard extends StatelessWidget {
       ),
       actions: actions,
       onCardTap: onCardTap,
+      margin: margin,
+      contentPadding: contentPadding,
     );
   }
 
@@ -100,6 +112,8 @@ class AdminEnfantUserCard extends StatelessWidget {
       subtitleLines: subtitleLines,
       actions: actions,
       onCardTap: onCardTap,
+      margin: margin,
+      contentPadding: contentPadding,
     );
   }
 }

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

@@ -1,5 +1,4 @@
 import 'package:flutter/material.dart';
-import 'package:p_tits_pas/models/enfant_admin_model.dart';
 import 'package:p_tits_pas/utils/phone_utils.dart';
 import 'package:p_tits_pas/models/parent_child_summary.dart';
 import 'package:p_tits_pas/models/parent_model.dart';
@@ -7,6 +6,7 @@ import 'package:p_tits_pas/models/user.dart';
 import 'package:p_tits_pas/services/user_service.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_child_detail_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_children_affiliation_panel.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_select_enfant_modal.dart';
 import 'package:p_tits_pas/widgets/admin/common/admin_status_capsule.dart';
 import 'package:p_tits_pas/widgets/common/identity_block.dart';
 import 'package:p_tits_pas/widgets/admin/validation_modal_theme.dart';
@@ -321,41 +321,11 @@ class _AdminParentEditModalState extends State<AdminParentEditModal> {
   }
 
   Future<void> _attachChild() async {
-    List<EnfantAdminModel> all;
-    try {
-      all = await UserService.getEnfants();
-    } catch (e) {
     if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        SnackBar(content: Text(e.toString().replaceFirst('Exception: ', ''))),
-      );
-      return;
-    }
-
-    final linkedIds = _children.map((c) => c.id).toSet();
-    final candidates = all.where((e) => !linkedIds.contains(e.id)).toList();
-    if (candidates.isEmpty) {
-      if (!mounted) return;
-      ScaffoldMessenger.of(context).showSnackBar(
-        const SnackBar(content: Text('Aucun enfant disponible à rattacher')),
-      );
-      return;
-    }
-
-    if (!mounted) return;
-    final selected = await showDialog<EnfantAdminModel>(
-      context: context,
-      builder: (ctx) => SimpleDialog(
-        title: const Text('Rattacher un enfant'),
-        children: candidates
-            .map(
-              (e) => SimpleDialogOption(
-                onPressed: () => Navigator.pop(ctx, e),
-                child: Text(e.fullName),
-              ),
-            )
-            .toList(),
-      ),
+    final selected = await AdminSelectEnfantModal.show(
+      context,
+      excludeIds: _children.map((c) => c.id).toSet(),
+      title: 'Rattacher un enfant',
     );
     if (selected == null || !mounted) return;
 

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

@@ -0,0 +1,218 @@
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/models/assistante_maternelle_model.dart';
+import 'package:p_tits_pas/services/user_service.dart';
+import 'package:p_tits_pas/utils/am_vigilance.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_am_edit_modal.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_select_list_modal.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_user_card.dart';
+import 'package:p_tits_pas/widgets/admin/validation_modal_theme.dart';
+
+List<String> _amSelectSubtitleLines(AssistanteMaternelleModel am) {
+  final lines = <String>[];
+  final zone = (am.residenceCity ?? '').trim();
+  if (zone.isNotEmpty) lines.add('Zone : $zone');
+  final agrement = (am.approvalNumber ?? '').trim();
+  if (agrement.isNotEmpty) lines.add('Agrément : $agrement');
+  final max = am.maxChildren;
+  final free = amExpectedPlacesAvailable(
+        maxChildren: max,
+        childrenCount: am.children.length,
+      ) ??
+      am.placesAvailable;
+  if (free != null || max != null) {
+    lines.add('Places libres : ${free ?? '–'} / capa. ${max ?? '–'}');
+  }
+  lines.add('${am.children.length} enfant(s)');
+  return lines;
+}
+
+/// Sélection d'une AM à rattacher (fiche enfant) — ticket #147.
+/// S'appuie sur [AdminSelectListModal] (shell partagé avec #146).
+class AdminSelectAmModal {
+  AdminSelectAmModal._();
+
+  static Future<AssistanteMaternelleModel?> show(
+    BuildContext context, {
+    Set<String> excludeIds = const {},
+    String title = 'Choisir une assistante maternelle',
+  }) {
+    return AdminSelectListModal.show<AssistanteMaternelleModel>(
+      context,
+      title: title,
+      searchHint: 'Rechercher par nom, prénom ou zone…',
+      emptyMessage: 'Aucune assistante maternelle disponible',
+      noResultsMessage: 'Aucune AM avec place libre pour cette recherche',
+      toggleFilter: const AdminSelectToggleFilter<AssistanteMaternelleModel>(
+        label: 'Libre',
+        initialValue: true,
+        whenEnabled: amHasFreePlace,
+      ),
+      loadItems: () async {
+        final list = await UserService.getAssistantesMaternelles();
+        return list
+            .where((am) => !excludeIds.contains(am.user.id))
+            .toList()
+          ..sort(
+            (a, b) => a.user.fullName
+                .toLowerCase()
+                .compareTo(b.user.fullName.toLowerCase()),
+          );
+      },
+      matchesQuery: (am, q) {
+        final u = am.user;
+        final name = u.fullName.toLowerCase();
+        final fn = (u.prenom ?? '').toLowerCase();
+        final ln = (u.nom ?? '').toLowerCase();
+        final zone = (am.residenceCity ?? '').toLowerCase();
+        final agrement = (am.approvalNumber ?? '').toLowerCase();
+        return name.contains(q) ||
+            fn.contains(q) ||
+            ln.contains(q) ||
+            zone.contains(q) ||
+            agrement.contains(q);
+      },
+      resolveSelect: (ctx, am, reload) =>
+          _resolveAmSelection(ctx, am, reload),
+      itemBuilder: (context, am, onSelect) {
+        final full = !amHasFreePlace(am);
+        return AdminUserCard(
+          title: am.user.fullName,
+          avatarUrl: am.user.photoUrl,
+          fallbackIcon: Icons.face,
+          subtitleLines: _amSelectSubtitleLines(am),
+          vigilanceTooltip: amPlacesVigilanceMessage(am),
+          onCardTap: onSelect,
+          margin: const EdgeInsets.only(bottom: 4),
+          contentPadding: const EdgeInsets.symmetric(
+            horizontal: 10,
+            vertical: 5,
+          ),
+          backgroundColor: full ? const Color(0xFFFFEBEE) : null,
+          borderColor: full ? Colors.red.shade200 : null,
+          actions: [
+            IconButton(
+              icon: const Icon(Icons.add_link),
+              tooltip: 'Rattacher',
+              onPressed: onSelect,
+            ),
+          ],
+        );
+      },
+    );
+  }
+
+  static Future<AssistanteMaternelleModel?> _resolveAmSelection(
+    BuildContext context,
+    AssistanteMaternelleModel am,
+    Future<void> Function() reloadList,
+  ) async {
+    if (amHasFreePlace(am)) return am;
+
+    final selected = await showDialog<AssistanteMaternelleModel>(
+      context: context,
+      builder: (ctx) => _AmNoPlaceWarningDialog(initialAm: am),
+    );
+    await reloadList();
+    return selected;
+  }
+}
+
+/// Avertissement AM saturée + lien vers la fiche pour ajuster les places.
+class _AmNoPlaceWarningDialog extends StatefulWidget {
+  final AssistanteMaternelleModel initialAm;
+
+  const _AmNoPlaceWarningDialog({required this.initialAm});
+
+  @override
+  State<_AmNoPlaceWarningDialog> createState() =>
+      _AmNoPlaceWarningDialogState();
+}
+
+class _AmNoPlaceWarningDialogState extends State<_AmNoPlaceWarningDialog> {
+  late AssistanteMaternelleModel _am;
+  TapGestureRecognizer? _linkRecognizer;
+
+  @override
+  void initState() {
+    super.initState();
+    _am = widget.initialAm;
+    _linkRecognizer = TapGestureRecognizer()..onTap = _openAmFiche;
+  }
+
+  @override
+  void dispose() {
+    _linkRecognizer?.dispose();
+    super.dispose();
+  }
+
+  Future<void> _openAmFiche() async {
+    if (!mounted) return;
+    await showDialog<void>(
+      context: context,
+      builder: (ctx) => AdminAmEditModal(
+        assistante: _am,
+        onSaved: () async {
+          try {
+            final fresh =
+                await UserService.getAssistanteMaternelle(_am.user.id);
+            if (mounted) setState(() => _am = fresh);
+          } catch (_) {}
+        },
+      ),
+    );
+    if (!mounted) return;
+
+    try {
+      final fresh = await UserService.getAssistanteMaternelle(_am.user.id);
+      if (!mounted) return;
+      setState(() => _am = fresh);
+      if (amHasFreePlace(fresh)) {
+        Navigator.of(context).pop(fresh);
+      }
+    } catch (_) {}
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final name = _am.user.fullName.trim().isNotEmpty
+        ? _am.user.fullName.trim()
+        : 'Cette assistante maternelle';
+    const linkColor = ValidationModalTheme.primaryActionBackground;
+
+    return AlertDialog(
+      title: const Text('Plus de place disponible'),
+      content: Text.rich(
+        TextSpan(
+          style: const TextStyle(fontSize: 14, color: Colors.black87, height: 1.4),
+          children: [
+            TextSpan(
+              text: '$name n\'a plus de place libre pour accueillir '
+                  'un enfant supplémentaire.\n\n',
+            ),
+            const TextSpan(text: 'Vous pouvez '),
+            TextSpan(
+              text: 'ouvrir sa fiche',
+              style: TextStyle(
+                color: linkColor,
+                decoration: TextDecoration.underline,
+                fontWeight: FontWeight.w600,
+              ),
+              recognizer: _linkRecognizer,
+            ),
+            const TextSpan(
+              text: ' pour modifier la capacité ou les places, '
+                  'puis la sélectionner si une place se libère.',
+            ),
+          ],
+        ),
+      ),
+      actions: [
+        TextButton(
+          onPressed: () => Navigator.of(context).pop(),
+          child: const Text('Fermer'),
+        ),
+      ],
+    );
+  }
+}

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

@@ -0,0 +1,72 @@
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/models/enfant_admin_model.dart';
+import 'package:p_tits_pas/services/user_service.dart';
+import 'package:p_tits_pas/utils/enfant_status_utils.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_enfant_user_card.dart';
+import 'package:p_tits_pas/widgets/admin/common/admin_select_list_modal.dart';
+
+/// Sélection d'un enfant à rattacher (fiche AM / fiche parent) — ticket #146.
+/// S'appuie sur [AdminSelectListModal] (shell partagé avec #147).
+class AdminSelectEnfantModal {
+  AdminSelectEnfantModal._();
+
+  static Future<EnfantAdminModel?> show(
+    BuildContext context, {
+    Set<String> excludeIds = const {},
+    String title = 'Rattacher un enfant',
+    /// Affiché uniquement depuis la fiche AM : filtre les enfants déjà en garde.
+    bool showSansGardeFilter = false,
+  }) {
+    return AdminSelectListModal.show<EnfantAdminModel>(
+      context,
+      title: title,
+      searchHint: 'Rechercher par nom ou prénom…',
+      emptyMessage: 'Aucun enfant disponible à rattacher',
+      noResultsMessage: showSansGardeFilter
+          ? 'Aucun enfant sans garde pour cette recherche'
+          : 'Aucun résultat pour cette recherche',
+      toggleFilter: showSansGardeFilter
+          ? AdminSelectToggleFilter<EnfantAdminModel>(
+              label: 'Sans garde',
+              initialValue: true,
+              whenEnabled: (e) =>
+                  normalizeEnfantStatus(e.status) == 'sans_garde',
+            )
+          : null,
+      loadItems: () async {
+        final list = await UserService.getEnfants();
+        return list
+            .where((e) => !excludeIds.contains(e.id))
+            .toList()
+          ..sort(
+            (a, b) =>
+                a.fullName.toLowerCase().compareTo(b.fullName.toLowerCase()),
+          );
+      },
+      matchesQuery: (e, q) {
+        final name = e.fullName.toLowerCase();
+        final fn = (e.firstName ?? '').toLowerCase();
+        final ln = (e.lastName ?? '').toLowerCase();
+        return name.contains(q) || fn.contains(q) || ln.contains(q);
+      },
+      itemBuilder: (context, e, onSelect) {
+        return AdminEnfantUserCard.fromEnfant(
+          e,
+          onCardTap: onSelect,
+          margin: const EdgeInsets.only(bottom: 4),
+          contentPadding: const EdgeInsets.symmetric(
+            horizontal: 10,
+            vertical: 5,
+          ),
+          actions: [
+            IconButton(
+              icon: const Icon(Icons.add_link),
+              tooltip: 'Rattacher',
+              onPressed: onSelect,
+            ),
+          ],
+        );
+      },
+    );
+  }
+}

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

@@ -0,0 +1,367 @@
+import 'package:flutter/material.dart';
+import 'package:p_tits_pas/widgets/admin/validation_modal_theme.dart';
+
+/// Filtre optionnel (switch) sur la même ligne que la barre de recherche.
+class AdminSelectToggleFilter<T> {
+  final String label;
+  final bool initialValue;
+
+  /// Si le switch est activé, ne garde que les éléments pour lesquels
+  /// [whenEnabled] renvoie `true`.
+  final bool Function(T item) whenEnabled;
+
+  const AdminSelectToggleFilter({
+    required this.label,
+    required this.whenEnabled,
+    this.initialValue = true,
+  });
+}
+
+/// Shell générique « rechercher + liste + sélection » pour les modales admin.
+/// Utilisé par la sélection d'enfant (#146) et la sélection d'AM (#147).
+class AdminSelectListModal<T> extends StatefulWidget {
+  final String title;
+  final String searchHint;
+  final Future<List<T>> Function() loadItems;
+  final bool Function(T item, String query) matchesQuery;
+  final Widget Function(
+    BuildContext context,
+    T item,
+    VoidCallback onSelect,
+  ) itemBuilder;
+  final String emptyMessage;
+  final String noResultsMessage;
+  final double modalWidth;
+
+  /// Hauteur d'une carte (pour dimensionner la liste à ≥ [minVisibleCards]).
+  final double cardExtent;
+
+  /// Nombre minimum de cartes visibles dans la zone scrollable.
+  final int minVisibleCards;
+
+  /// Switch optionnel à droite du champ de recherche (ex. « Sans garde », « Libre »).
+  final AdminSelectToggleFilter<T>? toggleFilter;
+
+  /// Si fourni, appelé avant de valider la sélection.
+  /// Retourne l'élément à pop (éventuellement rafraîchi), ou `null` pour annuler.
+  final Future<T?> Function(
+    BuildContext context,
+    T item,
+    Future<void> Function() reload,
+  )? resolveSelect;
+
+  const AdminSelectListModal({
+    super.key,
+    required this.title,
+    required this.loadItems,
+    required this.matchesQuery,
+    required this.itemBuilder,
+    this.searchHint = 'Rechercher…',
+    this.emptyMessage = 'Aucun élément disponible',
+    this.noResultsMessage = 'Aucun résultat pour cette recherche',
+    this.modalWidth = 930,
+    this.cardExtent = 52,
+    this.minVisibleCards = 8,
+    this.toggleFilter,
+    this.resolveSelect,
+  });
+
+  static Future<T?> show<T>(
+    BuildContext context, {
+    required String title,
+    required Future<List<T>> Function() loadItems,
+    required bool Function(T item, String query) matchesQuery,
+    required Widget Function(
+      BuildContext context,
+      T item,
+      VoidCallback onSelect,
+    ) itemBuilder,
+    String searchHint = 'Rechercher…',
+    String emptyMessage = 'Aucun élément disponible',
+    String noResultsMessage = 'Aucun résultat pour cette recherche',
+    double modalWidth = 930,
+    double cardExtent = 52,
+    int minVisibleCards = 8,
+    AdminSelectToggleFilter<T>? toggleFilter,
+    Future<T?> Function(
+      BuildContext context,
+      T item,
+      Future<void> Function() reload,
+    )? resolveSelect,
+  }) {
+    return showDialog<T>(
+      context: context,
+      builder: (ctx) => AdminSelectListModal<T>(
+        title: title,
+        loadItems: loadItems,
+        matchesQuery: matchesQuery,
+        itemBuilder: itemBuilder,
+        searchHint: searchHint,
+        emptyMessage: emptyMessage,
+        noResultsMessage: noResultsMessage,
+        modalWidth: modalWidth,
+        cardExtent: cardExtent,
+        minVisibleCards: minVisibleCards,
+        toggleFilter: toggleFilter,
+        resolveSelect: resolveSelect,
+      ),
+    );
+  }
+
+  @override
+  State<AdminSelectListModal<T>> createState() =>
+      _AdminSelectListModalState<T>();
+}
+
+class _AdminSelectListModalState<T> extends State<AdminSelectListModal<T>> {
+  final _searchCtrl = TextEditingController();
+  List<T> _all = [];
+  bool _loading = true;
+  String? _error;
+  late bool _toggleOn;
+  bool _resolving = false;
+
+  double get _listHeight =>
+      widget.cardExtent * widget.minVisibleCards;
+
+  @override
+  void initState() {
+    super.initState();
+    _toggleOn = widget.toggleFilter?.initialValue ?? false;
+    _searchCtrl.addListener(() => setState(() {}));
+    _load();
+  }
+
+  @override
+  void dispose() {
+    _searchCtrl.dispose();
+    super.dispose();
+  }
+
+  Future<void> _load() async {
+    setState(() {
+      _loading = true;
+      _error = null;
+    });
+    try {
+      final list = await widget.loadItems();
+      if (!mounted) return;
+      setState(() {
+        _all = list;
+        _loading = false;
+      });
+    } catch (e) {
+      if (!mounted) return;
+      setState(() {
+        _loading = false;
+        _error = e.toString().replaceFirst('Exception: ', '');
+      });
+    }
+  }
+
+  Future<void> _handleSelect(T item) async {
+    if (_resolving) return;
+    final resolve = widget.resolveSelect;
+    if (resolve == null) {
+      Navigator.of(context).pop(item);
+      return;
+    }
+    setState(() => _resolving = true);
+    try {
+      final chosen = await resolve(context, item, _load);
+      if (!mounted || chosen == null) return;
+      Navigator.of(context).pop(chosen);
+    } finally {
+      if (mounted) setState(() => _resolving = false);
+    }
+  }
+
+  List<T> get _filtered {
+    var list = _all;
+    final toggle = widget.toggleFilter;
+    if (toggle != null && _toggleOn) {
+      list = list.where(toggle.whenEnabled).toList();
+    }
+    final q = _searchCtrl.text.trim().toLowerCase();
+    if (q.isEmpty) return list;
+    return list.where((item) => widget.matchesQuery(item, q)).toList();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final toggle = widget.toggleFilter;
+
+    return Dialog(
+      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+      child: ConstrainedBox(
+        constraints: BoxConstraints(maxWidth: widget.modalWidth),
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Padding(
+              padding: const EdgeInsets.fromLTRB(18, 16, 4, 0),
+              child: Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      widget.title,
+                      style: const TextStyle(
+                        fontSize: 18,
+                        fontWeight: FontWeight.w700,
+                      ),
+                    ),
+                  ),
+                  IconButton(
+                    icon: const Icon(Icons.close),
+                    tooltip: 'Fermer',
+                    onPressed: () => Navigator.of(context).pop(),
+                  ),
+                ],
+              ),
+            ),
+            const Divider(height: 1),
+            Padding(
+              padding: const EdgeInsets.fromLTRB(16, 12, 16, 12),
+              child: Column(
+                crossAxisAlignment: CrossAxisAlignment.stretch,
+                children: [
+                  Row(
+                    crossAxisAlignment: CrossAxisAlignment.center,
+                    children: [
+                      Expanded(
+                        child: TextField(
+                          controller: _searchCtrl,
+                          decoration: InputDecoration(
+                            isDense: true,
+                            hintText: widget.searchHint,
+                            prefixIcon: const Icon(Icons.search, size: 20),
+                            border: OutlineInputBorder(
+                              borderRadius: BorderRadius.circular(8),
+                            ),
+                            contentPadding: const EdgeInsets.symmetric(
+                              horizontal: 12,
+                              vertical: 12,
+                            ),
+                          ),
+                        ),
+                      ),
+                      if (toggle != null) ...[
+                        const SizedBox(width: 12),
+                        Text(
+                          toggle.label,
+                          style: const TextStyle(fontSize: 13),
+                        ),
+                        const SizedBox(width: 4),
+                        Switch(
+                          value: _toggleOn,
+                          activeColor:
+                              ValidationModalTheme.primaryActionBackground,
+                          onChanged: (v) => setState(() => _toggleOn = v),
+                        ),
+                      ],
+                    ],
+                  ),
+                  const SizedBox(height: 12),
+                  SizedBox(
+                    height: _listHeight,
+                    child: DecoratedBox(
+                      decoration: BoxDecoration(
+                        color: Colors.white,
+                        borderRadius: BorderRadius.circular(8),
+                        border: Border.all(color: Colors.grey.shade300),
+                      ),
+                      child: ClipRRect(
+                        borderRadius: BorderRadius.circular(8),
+                        child: _buildBody(),
+                      ),
+                    ),
+                  ),
+                  const SizedBox(height: 12),
+                  Row(
+                    children: [
+                      const Spacer(),
+                      TextButton(
+                        onPressed: () => Navigator.of(context).pop(),
+                        child: const Text('Annuler'),
+                      ),
+                    ],
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildBody() {
+    if (_loading) {
+      return const Center(
+        child: CircularProgressIndicator(
+          color: ValidationModalTheme.primaryActionBackground,
+        ),
+      );
+    }
+
+    if (_error != null) {
+      return Center(
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              Icon(Icons.error_outline, size: 40, color: Colors.red.shade400),
+              const SizedBox(height: 12),
+              Text(
+                _error!,
+                textAlign: TextAlign.center,
+                style: TextStyle(color: Colors.red.shade700),
+              ),
+              const SizedBox(height: 12),
+              TextButton.icon(
+                onPressed: _load,
+                icon: const Icon(Icons.refresh),
+                label: const Text('Réessayer'),
+              ),
+            ],
+          ),
+        ),
+      );
+    }
+
+    final items = _filtered;
+    if (_all.isEmpty) {
+      return Center(
+        child: Text(
+          widget.emptyMessage,
+          style: const TextStyle(fontSize: 14, color: Colors.black54),
+        ),
+      );
+    }
+
+    if (items.isEmpty) {
+      return Center(
+        child: Text(
+          widget.noResultsMessage,
+          style: const TextStyle(fontSize: 14, color: Colors.black54),
+        ),
+      );
+    }
+
+    return ListView.builder(
+      padding: const EdgeInsets.fromLTRB(8, 8, 8, 4),
+      itemExtent: widget.cardExtent,
+      itemCount: items.length,
+      itemBuilder: (context, i) {
+        final item = items[i];
+        return widget.itemBuilder(
+          context,
+          item,
+          () => _handleSelect(item),
+        );
+      },
+    );
+  }
+}

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

@@ -15,6 +15,7 @@ class AdminUserCard extends StatefulWidget {
   final String? vigilanceTooltip;
   final VoidCallback? onCardTap;
   final EdgeInsetsGeometry? margin;
+  final EdgeInsetsGeometry? contentPadding;
 
   const AdminUserCard({
     super.key,
@@ -30,6 +31,7 @@ class AdminUserCard extends StatefulWidget {
     this.vigilanceTooltip,
     this.onCardTap,
     this.margin,
+    this.contentPadding,
   });
 
   @override
@@ -69,7 +71,8 @@ class _AdminUserCardState extends State<AdminUserCard> {
               side: BorderSide(color: widget.borderColor ?? Colors.grey.shade300),
             ),
             child: Padding(
-              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
+              padding: widget.contentPadding ??
+                  const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
               child: Row(
                 children: [
                   _buildAvatar(avatarUrl),
@@ -88,7 +91,10 @@ class _AdminUserCardState extends State<AdminUserCard> {
                   Expanded(
                     child: Row(
                       children: [
+                        // flex: 0 → largeur du nom ; le reste va aux infos
+                        // (évite le partage 50/50 qui tronque « Responsables »).
                         Flexible(
+                          flex: 0,
                           fit: FlexFit.loose,
                           child: Text(
                             widget.title.isNotEmpty ? widget.title : 'Sans nom',