Return key no longer sends message on iOS/iPad app

Previously, the Return key on either a physical iPad Keyboard or Apple Silicon MacBook would send a message in the iPad client. As of a recent update, the only way to send a message is to manually click the Send button in the UI. Can the Return key functionality be restored?

No source file or test is named; start by locating the iPad client's Return-key handling and the existing Send-button action. Reproduce with a physical iPad keyboard or Apple Silicon MacBook, then verify that Return sends the message again without breaking the manual Send button.

Written by the indexing model from the issue text.