TW-4308 Add labels for several messages part 2 (#4431)

Add ChooseLabelModal, delegate, and update label UI components

Wire add-labels action across Thread, Search, and Dashboard

lib/features/thread/presentation/thread_view.dart

@@ -83,6 +83,9 @@ class ThreadView extends GetWidget<ThreadController>
                     if (!controller.responsiveUtils.isWebDesktop(context))
                       ... [
                         Obx(() {
+                          final isLabelAvailable =
+                              controller.mailboxDashBoardController.isLabelAvailable;
+
                           return MobileAppBarThreadWidget(
                             responsiveUtils: controller.responsiveUtils,
                             imagePaths: controller.imagePaths,
@@ -104,6 +107,7 @@ class ThreadView extends GetWidget<ThreadController>
                                   type,
                                   emails,
                                   controller.selectedMailbox,
+                                  isLabelAvailable,
                                 ),
                             );
                         }),