TF-3410 Fix wrong text style avatar icon

Signed-off-by: dab246 <tdvu@linagora.com>

core/lib/presentation/utils/theme_utils.dart

@@ -162,6 +162,18 @@ class ThemeUtils {
     color: color,
   );
 
+  static TextStyle textStyleHeadingH4({
+    Color? color,
+    FontWeight? fontWeight,
+  }) => TextStyle(
+    fontFamily: ConstantsUI.fontApp,
+    fontWeight: fontWeight ?? FontWeight.w500,
+    letterSpacing: 0.0,
+    fontSize: 32,
+    height: 40 / 32,
+    color: color,
+  );
+
   static TextStyle textStyleHeadingHeadingSmall({
     Color? color,
     FontWeight? fontWeight,

lib/features/base/widget/email_avatar_builder.dart

@@ -1,5 +1,6 @@
 
 import 'package:core/presentation/extensions/color_extension.dart';
+import 'package:core/presentation/utils/theme_utils.dart';
 import 'package:core/presentation/views/image/avatar_builder.dart';
 import 'package:flutter/material.dart';
 import 'package:model/email/presentation_email.dart';
@@ -19,10 +20,7 @@ class EmailAvatarBuilder extends StatelessWidget {
     return (AvatarBuilder()
       ..text(emailSelected.getAvatarText())
       ..size(50)
-      ..addTextStyle(const TextStyle(
+      ..addTextStyle(ThemeUtils.textStyleHeadingH4(color: Colors.white))
-          fontWeight: FontWeight.bold,
-          fontSize: 21,
-          color: Colors.white))
       ..backgroundColor(AppColor.colorAvatar)
       ..avatarColor(emailSelected.avatarColors))
     .build();

model/lib/email/presentation_email.dart

@@ -103,7 +103,7 @@ class PresentationEmail with EquatableMixin, SearchSnippetMixin {
 
   String getAvatarText() {
     if (getSenderName().isNotEmpty) {
-      return getSenderName().firstLetterToUpperCase;
+      return getSenderName().firstCharacterToUpperCase;
     }
     return '';
   }