Incorrect login error message

[Jatin24062005]

p5.js version

No response

What is your operating system?

None

Web browser and version

No response

Actual Behavior

The login field label says "Email or Username",

But if you leave it empty and try to submit, it shows error message:
"Please enter an email" ❌

This is confusing because users are also allowed to enter a Username.

Expected Behavior

The error message should say something like:
"Please enter your email or username"
to match the field label and actual login behavior.

Steps to reproduce

Steps:

1. Go to the p5.js Web Editor login page.
2. Try to submit the login form without filling the email/username field.
3. See the error message.

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