Gravatar is based on username even if email is available

Please note that security bugs or issues should be reported to security@pgadmin.org.

Describe the bug

When a pgadmin user has an email address set (e.g. from an OAuth2 provider), the Gravatar shown in the user menu is still based on the local username, which may be different from the Gravatar username of the user (or worse, the local username matches a Gravatar username of a different person).

To Reproduce

Steps to reproduce the behavior:

1. Ensure that SHOW_GRAVATAR_IMAGE = True
2. Create a pgadmin user with a username for which no Gravatar profile exists, and a valid email address for which a Gravatar profile exists
3. Log in as that user
4. Observe a default Gravatar next to the user’s name

Expected behavior

When a user’s email address is known, it should be used as the Gravatar identifier.

Error message

Screenshots

Desktop (please complete the following information):

• OS: Alpine Linux v3.24, Linux-7.1.8-200.fc44.aarch64-aarch64-with-musl1
• pgAdmin version: 9.17
• Mode: Server
• Browser (if running in server mode): Safari Version 26.6.2 (21624.5.1.11.3)
• Package type: Container

Additional context

Start by tracing the user-menu Gravatar rendering and the SHOW_GRAVATAR_IMAGE setting, then identify where the Gravatar identifier is selected. Reproduce the issue with a user whose email has a Gravatar profile, and verify that the displayed image uses the known email rather than the local username.