Add envelope settings step to wizard

Introduced a new step (step 2) in the `CreateEnvelopeWizardPopup` for configuring envelope settings, including security, reminders, and expiration options.

- Added fields for certification type, final email options, 2FA, access codes, and reminder settings.
- Updated step titles, descriptions, and total steps from 4 to 5.
- Implemented validation logic for the new settings step.
- Added methods to handle changes in settings fields and apply defaults.
- Updated `CreateEnvelopeWizardResult` and `CreateEnvelopeBootstrapPayload` to include new fields.
- Modified `SenderEditorPage` and `SenderPage` to handle new settings.
- Styled the new step with updated CSS for grids, groups, and toggles.
- Refactored state reset logic to initialize new fields.

EnvelopeGenerator.Server/EnvelopeGenerator.Server.Client/Pages/SenderEditorPage.razor

@@ -732,6 +732,17 @@
         _envelopeMessage = payload.Message ?? string.Empty;
         _selectedEnvelopeTypeId = payload.EnvelopeTypeId;
         _language = string.IsNullOrWhiteSpace(payload.Language) ? "de-DE" : payload.Language;
+        _useAccessCode = payload.UseAccessCode;
+        _tfaEnabled = payload.TFAEnabled;
+        _certificationType = payload.CertificationType;
+        _finalEmailToCreator = payload.FinalEmailToCreator;
+        _finalEmailToReceivers = payload.FinalEmailToReceivers;
+        _sendReminderEmails = payload.SendReminderEmails;
+        _firstReminderDays = payload.FirstReminderDays;
+        _reminderIntervalDays = payload.ReminderIntervalDays;
+        _expiresWhenDays = payload.ExpiresWhenDays;
+        _expiresWarningWhenDays = payload.ExpiresWarningWhenDays;
+        NormalizeSettings();
 
         _receivers = payload.Receivers
             .Select((receiver, index) => new ReceiverDraft(