Describe the bug

When running gh auth login with SSH as the preferred protocol, the CLI asks:

What title would you like to use for the SSH key?

However, if an existing SSH key is already present locally (e.g. ~/.ssh/id_ed25519) and already registered on GitHub, the CLI silently reuses that key and never uploads a new one — meaning the title the user just typed is completely discarded with no feedback.

Steps to reproduce

1. Have an existing ~/.ssh/id_ed25519 key already added to your GitHub account
2. Run gh auth login
3. Select GitHub.com → SSH → authenticate via browser
4. When prompted, enter a title for the SSH key
5. Complete authentication

Expected behavior

Either:

• Skip the SSH key title prompt entirely if an existing key will be reused, or
• After completing auth, display a message like: "An existing SSH key was found and reused. The title you entered was not used."

Actual behavior

The title prompt is shown, the user enters a name, and it is silently discarded. No new key appears on GitHub. The user has no way of knowing their input had no effect.

Environment

gh version 2.x (darwin)