TF-2188 Disable sending queue on iOS

(cherry picked from commit cec4ccba1a4e4667db008796bbf89a166d3b333f)

lib/features/composer/presentation/composer_controller.dart

@@ -874,7 +874,7 @@ class ComposerController extends BaseController {
         ? CreateNewMailboxRequest(Id(_uuid.v1()), PresentationMailbox.outboxMailboxName)
         : null;
 
-      if (PlatformInfo.isMobile && !networkConnectionController.isNetworkConnectionAvailable()) {
+      if (PlatformInfo.isAndroid && !networkConnectionController.isNetworkConnectionAvailable()) {
         switch(arguments.sendingEmailActionType) {
           case SendingEmailActionType.create:
             _showConfirmDialogStoreSendingEmail(

lib/features/mailbox_dashboard/presentation/controller/mailbox_dashboard_controller.dart

@@ -366,23 +366,25 @@ class MailboxDashBoardController extends ReloadableController {
   @override
   void handleExceptionAction({Failure? failure, Exception? exception}) {
     super.handleExceptionAction(failure: failure, exception: exception);
-    if (PlatformInfo.isMobile &&
-        failure is SendEmailFailure &&
-        exception is NoNetworkError) {
-      if (failure.emailRequest.storedSendingId != null) {
-        _handleStoreSendingEmail(
-          failure.session,
-          failure.accountId,
-          failure.emailRequest,
-          failure.mailboxRequest
-        );
-      } else {
-        _handleUpdateSendingEmail(
-          failure.session,
-          failure.accountId,
-          failure.emailRequest,
-          failure.mailboxRequest
-        );
+    if (failure is SendEmailFailure && exception is NoNetworkError) {
+      if (PlatformInfo.isIOS && currentContext != null) {
+        _showToastSendMessageFailure(AppLocalizations.of(currentContext!).sendMessageFailure);
+      } else if (PlatformInfo.isAndroid) {
+        if (failure.emailRequest.storedSendingId != null) {
+          _handleStoreSendingEmail(
+            failure.session,
+            failure.accountId,
+            failure.emailRequest,
+            failure.mailboxRequest
+          );
+        } else {
+          _handleUpdateSendingEmail(
+            failure.session,
+            failure.accountId,
+            failure.emailRequest,
+            failure.mailboxRequest
+          );
+        }
       }
     }
   }