fix(mu): email content not displayed due to sanitize html

(cherry picked from commit 2f06e52d81864a62d6e588bb24a6845e20371bf4)

core/lib/presentation/utils/html_transformer/dom/sanitize_hyper_link_tag_in_html_transformers.dart

@@ -16,7 +16,7 @@ class SanitizeHyperLinkTagInHtmlTransformer extends DomTransformer {
     Map<String, String>? mapUrlDownloadCID,
   }) async {
     try {
-      final elements = document.querySelectorAll('a');
+      final elements = document.querySelectorAll('a[href]');
 
       if (elements.isEmpty) return;
 

core/lib/presentation/utils/html_transformer/text/standardize_html_sanitizing_transformers.dart

@@ -3,40 +3,13 @@ import 'package:core/presentation/utils/html_transformer/base/text_transformer.d
 import 'package:core/presentation/utils/html_transformer/sanitize_html.dart';
 
 class StandardizeHtmlSanitizingTransformers extends TextTransformer {
-
-  static const List<String> mailAllowedHtmlAttributes = [
-    'style',
-    'public-asset-id',
-    'data-filename',
-    'bgcolor',
-    'id',
-    'class',
-    'data-mimetype',
-  ];
-
-  static const List<String> mailAllowedHtmlTags = [
-    'font',
-    'u',
-    'center',
-    'style',
-    'body',
-    'section',
-    'google-sheets-html-origin',
-    'colgroup',
-    'col',
-    'nav',
-    'main',
-    'footer',
-    'supress_time_adjustment',
-  ];
+  static final SanitizeHtml _sanitizer = SanitizeHtml();
 
   const StandardizeHtmlSanitizingTransformers();
 
   @override
-  String process(String text, HtmlEscape htmlEscape) =>
-    SanitizeHtml().process(
-      inputHtml: text,
-      allowAttributes: mailAllowedHtmlAttributes,
-      allowTags: mailAllowedHtmlTags,
-    );
+  String process(String text, HtmlEscape htmlEscape) {
+    if (text.isEmpty) return '';
+    return _sanitizer.process(inputHtml: text);
+  }
 }