Declining Invites

### Your use case

If you open an invite and decline it, it should take you back to the Room list.
Currently you have to press back yourself after the invite is declined.

#### What would you like to do?
1. Let declining an invite in full-screen navigate you back to the Room list.

2. "Decline and block" should remove all other invites from the now blocked user.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

### Are you willing to provide a PR?

No

Start by tracing the full-screen invite decline flow and the navigation destination after an invite is declined. Check how “Decline and block” handles the blocked user’s other invites; done means returning to the Room list after decline and removing those other invites after blocking.

Written by the indexing model from the issue text.