Improvement: Toggle User Info when tapping the participant name in 1:1 DM foreword

Description:

In a 1:1 direct message room, the room foreword shows: “You have joined a new direct message with ”. The is rendered as a clickable link (Tag with href pointing to the same DM route, e.g. /direct/<username>).

When the user is already inside that DM, clicking the name re-navigates to the current room. That re-triggers the room open flow and causes visible flickering (and unnecessary navigation), instead of doing something useful (e.g. opening User Info or being a no-op).

Steps to reproduce:

1. Log in as user A.
2. Open a 1:1 Direct message with user B (only you and B in the room).
3. Scroll to the top of the message list so the room foreword is visible (“You have joined a new direct message with …”).
4. Click the clickable username for B in the foreword.
   (Optional) Click the same username again and observe repeated flicker.

Expected behavior:

• Clicking the username in the foreword should not re-navigate to the same DM when already in that room (no flicker).
• Preferably, the control should toggle the same User Info / contextual panel as the room header flow (consistent with opening User Info for the other participant in a 1:1 DM), or at minimum no-op when already on the target room.

Actual behavior:

• Each click performs navigation to the same DM URL / room open sequence.
• The chat UI flickers (brief reload / re-mount style behavior) on each click.
• No User Info is opened from that control in 1:1 DM.

https://github.com/user-attachments/assets/546e2e82-39e1-497b-8e8a-49273a151262

Start by locating the 1:1 DM room foreword entry point and its clickable participant name, then compare it with the room header's User Info flow. Reproduce the current same-room navigation and verify that clicking the name opens User Info or at least avoids re-navigation and flicker.