chore: Follow up selectable text

lib/pages/chat/events/html_message.dart

@@ -74,7 +74,9 @@ class HtmlMessage extends StatelessWidget {
     );
 
     // there is no need to pre-validate the html, as we validate it while rendering
-    return Html(
+    return MouseRegion(
+      cursor: SystemMouseCursors.text,
+      child: Html(
         data: linkifiedRenderHtml,
         style: {
           '*': Style(
@@ -147,6 +149,7 @@ class HtmlMessage extends StatelessWidget {
           'html',
         },
         shrinkWrap: true,
+      ),
     );
   }