Chat does not show messages list after lobby disabled

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Steps to reproduce

1. Set up HPB (internal signaling waits for /room interval fetch, so it's not affected)
2. As user1, set lobby in conversation
3. As user2, join conversation and be in the lobby
4. As user1, disable lobby
5. As user2, see infinite loading (lastReadMessage is 0 from lobby)

Actual behaviour

Signaling emits 'should-refresh-conversations' with updated properties, so clients can promptly react to change in session (LeftSidebar.vue).
However, unlocking lobbyState does not update lastReadMessage, which only happened with 3-s delay (App.vue)

• Unify logic in one place
• Capture lobbyState-only update and fetch whole room instead of partial update
• OR Capture lastReadMessage changes from 0 to reinitialize chat
• Performance issues for big amount of guests/users?

Talk app

Talk app version: 31

Custom Signaling server configured: yes