Improve UX for accepting an invite

### Description

There should be a "Accept" or "Deny" button / modal

### Epic/Story

_No response_

### Have you provided an initial effort estimate for this issue?

I have provided an initial effort estimate

Start by reproducing the invite flow and reviewing the screenshot attached to the issue to locate the screen where an invitation is handled. Trace the existing invite state and acceptance path; done means the screen offers clear Accept and Deny actions, with the corresponding behavior working end to end.

Written by the indexing model from the issue text.