feat(#156): création dossier AM staff — API + wizard dashboard.

Squash depuis develop : POST /assistantes-maternelles/dossier (actif +
mail MDP), AmDossierWizard create/review, validations inscription.

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

frontend/lib/widgets/common/identity_block.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:p_tits_pas/models/dossier_unifie.dart';
 import 'package:p_tits_pas/models/user.dart';
+import 'package:p_tits_pas/utils/name_format_utils.dart';
 import 'package:p_tits_pas/utils/phone_utils.dart';
 import 'package:p_tits_pas/widgets/admin/common/validation_detail_section.dart';
 
@@ -67,7 +68,9 @@ class IdentityValues {
 
 /// Bloc identité : Nom/Prénom, Tél/Email, Adresse, CP/Ville.
 /// Grille partagée (création de compte, validation AM/famille, fiches admin, etc.).
-class IdentityBlock extends StatelessWidget {  final String? title;
+class IdentityBlock extends StatelessWidget {
+  final String? title;
+  final bool expandVertically;
 
   final String? _nom;
   final String? _prenom;
@@ -91,6 +94,7 @@ class IdentityBlock extends StatelessWidget {  final String? title;
   const IdentityBlock.readOnly({
     super.key,
     this.title,
+    this.expandVertically = false,
     required String nom,
     required String prenom,
     required String telephone,
@@ -116,6 +120,7 @@ class IdentityBlock extends StatelessWidget {  final String? title;
   const IdentityBlock.editable({
     super.key,
     this.title,
+    this.expandVertically = false,
     required TextEditingController nomController,
     required TextEditingController prenomController,
     required TextEditingController telephoneController,
@@ -142,11 +147,13 @@ class IdentityBlock extends StatelessWidget {  final String? title;
   factory IdentityBlock.readOnlyValues({
     Key? key,
     String? title,
+    bool expandVertically = false,
     required IdentityValues values,
   }) {
     return IdentityBlock.readOnly(
       key: key,
       title: title,
+      expandVertically: expandVertically,
       nom: values.nom,
       prenom: values.prenom,
       telephone: values.telephone,
@@ -163,10 +170,12 @@ class IdentityBlock extends StatelessWidget {  final String? title;
     Key? key,
     String? title,
     String emptyLabel = 'Non défini',
+    bool expandVertically = false,
   }) {
     return IdentityBlock.readOnlyValues(
       key: key,
       title: title,
+      expandVertically: expandVertically,
       values: IdentityValues.fromUser(user, emptyLabel: emptyLabel),
     );
   }
@@ -196,29 +205,29 @@ class IdentityBlock extends StatelessWidget {  final String? title;
         title: title,
         rowLayout: rowLayout,
         rowFlex: rowFlex,
+        expandVertically: expandVertically,
         fields: [
           ValidationLabeledField(
             label: 'Nom',
-            field: ValidationEditableField(controller: _nomCtrl!),
+            field: ValidationEditableField(
+              controller: _nomCtrl!,
+              inputFormatters: const [PersonNameInputFormatter()],
+            ),
           ),
           ValidationLabeledField(
             label: 'Prénom',
-            field: ValidationEditableField(controller: _prenomCtrl!),
+            field: ValidationEditableField(
+              controller: _prenomCtrl!,
+              inputFormatters: const [PersonNameInputFormatter()],
+            ),
           ),
           ValidationLabeledField(
             label: 'Téléphone',
-            field: ValidationEditableField(
-              controller: _telCtrl!,
-              keyboardType: TextInputType.phone,
-              inputFormatters: frenchPhoneInputFormatters,
-            ),
+            field: ValidationPhoneField(controller: _telCtrl!),
           ),
           ValidationLabeledField(
             label: 'Email',
-            field: ValidationEditableField(
-              controller: _emailCtrl!,
-              keyboardType: TextInputType.emailAddress,
-            ),
+            field: ValidationEmailField(controller: _emailCtrl!),
           ),
           ValidationLabeledField(
             label: 'Adresse (N° et Rue)',
@@ -226,14 +235,14 @@ class IdentityBlock extends StatelessWidget {  final String? title;
           ),
           ValidationLabeledField(
             label: 'Code postal',
-            field: ValidationEditableField(
-              controller: _cpCtrl!,
-              keyboardType: TextInputType.number,
-            ),
+            field: ValidationPostalCodeField(controller: _cpCtrl!),
           ),
           ValidationLabeledField(
             label: 'Ville',
-            field: ValidationEditableField(controller: _villeCtrl!),
+            field: ValidationEditableField(
+              controller: _villeCtrl!,
+              inputFormatters: const [PersonNameInputFormatter()],
+            ),
           ),
         ],
       );
@@ -243,6 +252,7 @@ class IdentityBlock extends StatelessWidget {  final String? title;
       title: title,
       rowLayout: rowLayout,
       rowFlex: rowFlex,
+      expandVertically: expandVertically,
       fields: [
         ValidationLabeledField(
           label: 'Nom',