Remove functions that are not called on some platforms

lib/features/composer/presentation/composer_controller.dart

@@ -1340,11 +1340,6 @@ class ComposerController extends BaseController with DragDropFileMixin {
       _autoFocusFieldWhenLauncher);
   }
 
-  void deleteComposer() {
-    FocusManager.instance.primaryFocus?.unfocus();
-    mailboxDashBoardController.closeComposerOverlay();
-  }
-
   void addEmailAddressType(PrefixEmailAddress prefixEmailAddress) {
     switch(prefixEmailAddress) {
       case PrefixEmailAddress.from:

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

@@ -1276,8 +1276,6 @@ class MailboxDashBoardController extends ReloadableController {
         result is SaveEmailAsDraftsSuccess ||
         result is UpdateEmailDraftsSuccess) {
       consumeState(Stream.value(Right<Failure, Success>(result)));
-    } else if (validateSendingEmailFailedWhenNetworkIsLostOnMobile(result)) {
-      _storeSendingEmailInCaseOfSendingFailureInMobile(result);
     }
 
     await _removeComposerCacheOnWeb();
@@ -1449,8 +1447,6 @@ class MailboxDashBoardController extends ReloadableController {
       } else if (validateSendingEmailFailedWhenNetworkIsLostOnMobile(result)) {
         _storeSendingEmailInCaseOfSendingFailureInMobile(result);
       }
-
-      await _removeComposerCacheOnWeb();
     }
   }