fix(#156): caler la modale AM sur les TF et unifier create/review.

ValidationFormMetrics (titres, TF, écarts) pilote la hauteur ; photo
étirée sur le corps ; mêmes widgets create et validation.

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

frontend/lib/widgets/common/identity_block.dart

@@ -68,7 +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;
@@ -92,6 +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,
@@ -117,6 +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,
@@ -143,11 +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,
@@ -164,10 +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),
     );
   }
@@ -197,6 +205,7 @@ class IdentityBlock extends StatelessWidget {  final String? title;
         title: title,
         rowLayout: rowLayout,
         rowFlex: rowFlex,
+        expandVertically: expandVertically,
         fields: [
           ValidationLabeledField(
             label: 'Nom',
@@ -243,6 +252,7 @@ class IdentityBlock extends StatelessWidget {  final String? title;
       title: title,
       rowLayout: rowLayout,
       rowFlex: rowFlex,
+      expandVertically: expandVertically,
       fields: [
         ValidationLabeledField(
           label: 'Nom',