mentions : make @-mentions tappable to navigate to user profiles

[loveucifer]

mentions: Enable navigation to user profiles on tap on chat threads

Before, tapping on an @-mention in a message had no effect. This was inconsistent with tapping a sender's name or avatar, which navigates to their profile in the thread . This change makes @-mentions tappable to provide a consistent user experience and match web functionality as mentioned in the issue

The HTML parser extracts the data-user-id" attribute from the mention's element and stores it in theUserMentionNode. The UserMentionwidget uses this "id" to wrap the text in aGestureDetector`, navigating to the user's profile page on tap.

Working Demo

https://github.com/user-attachments/assets/b13e114c-1150-4c5d-8361-c5e566756923

Fixes : #1867