Added placeholder for lastName and role addition functionality

frontend/pshared/lib/models/invitation/invitation.dart

@@ -8,23 +8,36 @@ import 'package:pshared/models/invitation/status.dart';
 class InvitationContent {
   final String email;
   final String name;
+  final String lastName;
   final String comment;
 
   const InvitationContent({
     required this.email,
     required this.name,
+    required this.lastName,
     required this.comment,
   });
 
   InvitationContent copyWith({
     String? email,
     String? name,
+    String? lastName,
     String? comment,
   }) => InvitationContent(
     email: email ?? this.email,
     name: name ?? this.name,
+    lastName: lastName ?? this.lastName,
     comment: comment ?? this.comment,
   );
+
+  String get fullName {
+    final trimmedName = name.trim();
+    final trimmedLastName = lastName.trim();
+    if (trimmedName.isEmpty && trimmedLastName.isEmpty) return '';
+    if (trimmedName.isEmpty) return trimmedLastName;
+    if (trimmedLastName.isEmpty) return trimmedName;
+    return '$trimmedName $trimmedLastName';
+  }
 }
 
 class Invitation implements PermissionBoundStorable {
@@ -60,7 +73,7 @@ class Invitation implements PermissionBoundStorable {
   @override
   String get organizationRef => permissionBound.organizationRef;
 
-  String get inviteeDisplayName => content.name.isNotEmpty ? content.name : content.email;
+  String get inviteeDisplayName => content.fullName.isNotEmpty ? content.fullName : content.email;
   bool get isExpired => expiresAt.isBefore(DateTime.now().toUtc());
   bool get isPending => status == InvitationStatus.created || status == InvitationStatus.sent;
 
@@ -91,6 +104,7 @@ Invitation newInvitation({
   required String inviterRef,
   required String email,
   String name = '',
+  String lastName = '',
   String comment = '',
   InvitationStatus status = InvitationStatus.created,
   DateTime? expiresAt,
@@ -106,6 +120,6 @@ Invitation newInvitation({
   inviterRef: inviterRef,
   status: status,
   expiresAt: expiresAt ?? DateTime.now().toUtc().add(const Duration(days: 7)),
-  content: InvitationContent(email: email, name: name, comment: comment),
+  content: InvitationContent(email: email, name: name, lastName: lastName, comment: comment),
   isArchived: isArchived,
 );