Improve text replace in Scribe

- Delete selection content before inserting
- Insert correct HTML

core/lib/utils/string_convert.dart

@@ -214,4 +214,10 @@ class StringConvert {
 
     return textContent.trim();
   }
+
+  static String convertTextContentToHtmlContent(String textContent) {
+    final htmlContent = textContent.replaceAll('\n', '<br>');
+
+    return '<div>$htmlContent</div>';
+  }
 }

lib/features/composer/presentation/extensions/ai_scribe/handle_ai_scribe_in_composer_extension.dart

@@ -29,10 +29,15 @@ extension HandleAiScribeInComposerExtension on ComposerController {
     }
   }
 
-  void insertTextInEditor(String text) {
+  void insertTextInEditor(String text) async {
-    final htmlContent = text.replaceAll('\n', '<br>');
+    final htmlContent = StringConvert.convertTextContentToHtmlContent(text);
 
     if (PlatformInfo.isWeb) {
+      await richTextWebController?.editorController.evaluateJavascriptWeb(
+        HtmlUtils.deleteSelectionContent.name,
+        hasReturnValue: false,
+      );
+
       richTextWebController?.editorController.insertHtml(htmlContent);
     } else {
       richTextMobileTabletController?.htmlEditorApi?.insertHtml(htmlContent);