Added placeholder for lastName and role addition functionality

Try to rebase

frontend/pweb/lib/pages/invitations/page.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 
 import 'package:collection/collection.dart';
+
 import 'package:provider/provider.dart';
 
 import 'package:pshared/models/resources.dart';
@@ -13,6 +14,7 @@ import 'package:pweb/pages/invitations/widgets/form/form.dart';
 import 'package:pweb/pages/invitations/widgets/list/list.dart';
 import 'package:pweb/pages/loader.dart';
 import 'package:pweb/widgets/error/snackbar.dart';
+import 'package:pweb/widgets/roles/create_role_dialog.dart';
 
 import 'package:pweb/generated/i18n/app_localizations.dart';
 
@@ -27,12 +29,34 @@ class InvitationsPage extends StatefulWidget {
 class _InvitationsPageState extends State<InvitationsPage> {
   final GlobalKey<FormState> _formKey = GlobalKey<FormState>();
   final TextEditingController _emailController = TextEditingController();
-  final TextEditingController _nameController = TextEditingController();
+  final TextEditingController _firstNameController = TextEditingController();
+  final TextEditingController _lastNameController = TextEditingController();
   final TextEditingController _messageController = TextEditingController();
 
   String? _selectedRoleRef;
   int _expiryDays = 7;
 
+  Future<void> _createRole() async {
+    final loc = AppLocalizations.of(context)!;
+    final draft = await showCreateRoleDialog(context);
+    if (draft == null) return;
+
+    final permissions = context.read<PermissionsProvider>();
+    final createdRole = await executeActionWithNotification(
+      context: context,
+      action: () => permissions.createRoleDescription(
+        name: draft.name,
+        description: draft.description.isEmpty ? null : draft.description,
+      ),
+      successMessage: loc.invitationRoleCreated,
+      errorMessage: loc.invitationRoleCreateFailed,
+    );
+
+    if (createdRole != null && mounted) {
+      setState(() => _selectedRoleRef = createdRole.id);
+    }
+  }
+
   @override
   void didChangeDependencies() {
     super.didChangeDependencies();
@@ -41,15 +65,20 @@ class _InvitationsPageState extends State<InvitationsPage> {
 
   void _bootstrapRoleSelection() {
     final roles = context.read<PermissionsProvider>().roleDescriptions;
-    if (_selectedRoleRef == null && roles.isNotEmpty) {
-      _selectedRoleRef = roles.first.storable.id;
-    }
+    if (roles.isEmpty) return;
+    final firstRoleRef = roles.first.storable.id;
+    final isSelectedAvailable = _selectedRoleRef != null
+        && roles.any((role) => role.storable.id == _selectedRoleRef);
+    if (isSelectedAvailable) return;
+    if (!mounted) return;
+    setState(() => _selectedRoleRef = firstRoleRef);
   }
 
   @override
   void dispose() {
     _emailController.dispose();
-    _nameController.dispose();
+    _firstNameController.dispose();
+    _lastNameController.dispose();
     _messageController.dispose();
     super.dispose();
   }
@@ -71,7 +100,8 @@ class _InvitationsPageState extends State<InvitationsPage> {
       context: context,
       action: () => invitations.sendInvitation(
         email: _emailController.text.trim(),
-        name: _nameController.text.trim(),
+        name: _firstNameController.text.trim(),
+        lastName: _lastNameController.text.trim(),
         comment: _messageController.text.trim(),
         roleRef: roleRef,
         inviterRef: account.id,
@@ -82,7 +112,8 @@ class _InvitationsPageState extends State<InvitationsPage> {
     );
 
     _emailController.clear();
-    _nameController.clear();
+    _firstNameController.clear();
+    _lastNameController.clear();
     _messageController.clear();
   }
 
@@ -90,6 +121,7 @@ class _InvitationsPageState extends State<InvitationsPage> {
   Widget build(BuildContext context) {
     final loc = AppLocalizations.of(context)!;
     final permissions = context.watch<PermissionsProvider>();
+    final canCreateRoles = permissions.canCreate(ResourceType.roles);
 
     if (!permissions.canRead(ResourceType.invitations)) {
       return PageViewLoader(
@@ -109,8 +141,11 @@ class _InvitationsPageState extends State<InvitationsPage> {
               InvitationsForm(
                 formKey: _formKey,
                 emailController: _emailController,
-                nameController: _nameController,
+                firstNameController: _firstNameController,
+                lastNameController: _lastNameController,
                 messageController: _messageController,
+                canCreateRoles: canCreateRoles,
+                onCreateRole: _createRole,
                 expiryDays: _expiryDays,
                 onExpiryChanged: (value) => setState(() => _expiryDays = value),
                 selectedRoleRef: _selectedRoleRef,