TF-4227 Hide the "Scroll to top" button when there are no emails to load.

lib/features/thread/presentation/thread_view.dart

@@ -21,6 +21,7 @@ import 'package:tmail_ui_user/features/email/presentation/model/popup_menu_item_
 import 'package:tmail_ui_user/features/mailbox/domain/state/clear_mailbox_state.dart';
 import 'package:tmail_ui_user/features/mailbox/domain/state/mark_as_mailbox_read_state.dart';
 import 'package:tmail_ui_user/features/mailbox/domain/state/move_folder_content_state.dart';
+import 'package:tmail_ui_user/features/mailbox/presentation/model/presentation_label_mailbox.dart';
 import 'package:tmail_ui_user/features/mailbox_dashboard/domain/model/spam_report_state.dart';
 import 'package:tmail_ui_user/features/mailbox_dashboard/presentation/extensions/handle_ai_needs_action_extension.dart';
 import 'package:tmail_ui_user/features/mailbox_dashboard/presentation/extensions/handle_open_context_menu_extension.dart';
@@ -273,8 +274,12 @@ class ThreadView extends GetWidget<ThreadController>
       floatingActionButton: Column(
         mainAxisAlignment: MainAxisAlignment.end,
         children: [
-          Container(
+          Obx(() {
-            padding: const EdgeInsetsDirectional.only(end: 4.0),
+            final emailList =
+                controller.mailboxDashBoardController.emailsInCurrentMailbox;
+            if (emailList.isNotEmpty) {
+              return Padding(
+                padding: const EdgeInsetsDirectional.only(end: 4.0, bottom: 24),
                 child: ScrollToTopButtonWidget(
                   scrollController: controller.listEmailController,
                   onTap: controller.scrollToTop,
@@ -287,8 +292,11 @@ class ThreadView extends GetWidget<ThreadController>
                     colorFilter: Colors.white.asFilter(),
                   ),
                 ),
-          ),
+              );
-          const SizedBox(height: 24),
+            } else {
+              return const SizedBox.shrink();
+            }
+          }),
           _buildFloatingButtonCompose(context),
         ],
       ),
@@ -817,6 +825,8 @@ class ThreadView extends GetWidget<ThreadController>
               isFilterMessageActive: controller.mailboxDashBoardController.filterMessageOption.value != FilterMessageOption.all,
               isFavoriteFolder: controller.selectedMailbox?.isFavorite == true,
               isActionRequiredFolder: controller.selectedMailbox?.isActionRequired == true,
+              isLabelMailbox:
+                controller.selectedMailbox is PresentationLabelMailbox,
             ),
           );
         }