TF-3410 Update color and icon size of mailbox view

lib/features/mailbox/presentation/styles/label_mailbox_item_widget_styles.dart

@@ -14,4 +14,5 @@ class LabelMailboxItemWidgetStyles {
   static const FontWeight labelTeamMailboxTextFontWeight = FontWeight.bold;
   static const FontWeight labelFolderTextFontWeight = FontWeight.normal;
   static const FontWeight teamMailboxTextFontWeight = FontWeight.w400;
+  static const FontWeight labelFolderSelectedFontWeight = FontWeight.bold;
 }

lib/features/mailbox/presentation/styles/leading_mailbox_item_widget_styles.dart

@@ -1,14 +1,13 @@
 
 import 'package:core/presentation/extensions/color_extension.dart';
 import 'package:core/utils/direction_utils.dart';
-import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
 
 class LeadingMailboxItemWidgetStyles {
   static const double expandIconSize = 15;
   static const double expandIconSplashRadius = 12;
-  static const double emptyBoxSize = 32;
 
-  static const Color displayColor = AppColor.primaryColor;
+  static const Color displayColor = Colors.black;
   static const Color normalColor = AppColor.colorIconUnSubscribedMailbox;
 
   static const EdgeInsetsGeometry expandIconPadding = EdgeInsetsDirectional.only(start: 8);

lib/features/mailbox/presentation/styles/mailbox_icon_widget_styles.dart

@@ -1,6 +1,4 @@
 
-import 'package:core/utils/platform_info.dart';
-
 class MailboxIconWidgetStyles {
-  static double iconSize = PlatformInfo.isWeb ? 24 : 20;
+  static const double iconSize = 20.0;
 }