feat(webapp): on open chat room page close or on change profile and click chat change small chat

Created by: Tirokk

🍰 Pullrequest

Issues

On open chat room page close or on change profile and click chat change small chat.

• fixes #6589 (closed)
• fixes #6551 (closed)

🤖 ToDo

• Close mini chat when opening /chat page
  • select the former chat partner on the mini chat on the /chat page
    • made new PR #6606
    • room on /chat page is not selected yet
    • especially if the room is not loaded already
• on clicking the chat button on a new user profile and → change mini chat partner to actual profile
• clean up: search for Wolle