Recommend clients avoid including any invitations in the top level of the client.

It's not safe to show invitations at the client top level like Element clients do, especially the mobile clients. The old UX of hiding them behind a second screen was the correct decision.

No file, test, or entry point is mentioned. Read the relevant invitation guidance in the Matrix specification and compare its current recommendation with the requested top-level client UX guidance; done means the specification clearly documents the recommendation.

Written by the indexing model from the issue text.