TF-2667 Prevent close sending/saving dialog when click system back on mobile

lib/features/composer/presentation/composer_controller.dart

@@ -826,8 +826,7 @@ class ComposerController extends BaseController with DragDropFileMixin {
     required String emailContent,
     CancelToken? cancelToken
   }) {
-    return Get.dialog(
-      PointerInterceptor(
+    final childWidget = PointerInterceptor(
       child: SendingMessageDialogView(
         createEmailRequest: CreateEmailRequest(
           session: mailboxDashBoardController.sessionCurrent!,
@@ -858,7 +857,13 @@ class ComposerController extends BaseController with DragDropFileMixin {
         onCancelSendingEmailAction: _handleCancelSendingMessage,
         cancelToken: cancelToken,
       ),
-      ),
+    );
+
+    return Get.dialog(
+      PlatformInfo.isMobile
+        ? PopScope(canPop: false, child: childWidget)
+        : childWidget,
+      barrierDismissible: false,
       barrierColor: AppColor.colorDefaultCupertinoActionSheet,
     );
   }
@@ -2035,8 +2040,7 @@ class ComposerController extends BaseController with DragDropFileMixin {
     EmailId? draftEmailId,
     CancelToken? cancelToken,
   }) {
-    return Get.dialog(
-      PointerInterceptor(
+    final childWidget = PointerInterceptor(
       child: SavingMessageDialogView(
         createEmailRequest: CreateEmailRequest(
           session: mailboxDashBoardController.sessionCurrent!,
@@ -2065,7 +2069,12 @@ class ComposerController extends BaseController with DragDropFileMixin {
         onCancelSavingEmailToDraftsAction: _handleCancelSavingMessageToDrafts,
         cancelToken: cancelToken,
       ),
-      ),
+    );
+    return Get.dialog(
+      PlatformInfo.isMobile
+        ? PopScope(canPop: false, child: childWidget)
+        : childWidget,
+      barrierDismissible: false,
       barrierColor: AppColor.colorDefaultCupertinoActionSheet,
     );
   }

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

@@ -1391,7 +1391,12 @@ class MailboxDashBoardController extends ReloadableController {
         openComposerOverlay(arguments);
       }
     } else {
+      BackButtonInterceptor.removeByName(AppRoutes.dashboard);
+
       final result = await push(AppRoutes.composer, arguments: arguments);
+
+      BackButtonInterceptor.add(_onBackButtonInterceptor, name: AppRoutes.dashboard);
+
       if (result is SendingEmailArguments) {
         handleSendEmailAction(result);
       } else if (result is SendEmailSuccess ||