VitaGist Plus - Android App » Register Page and Login Page

Steps to Reproduce:

1. Open the Vitagist application.
2. Enter an invalid email format in the email field.
3. Enter any text in the password field.
4. Click on the Login button.

Expected Result:

An alert popup should appear with the message "Email not valid."

Actual Result:

An incorrect validation message appears instead of the expected one.

• If the email field is left empty, the alert popup should display: "Email is required."
• If the email format is invalid, the alert popup should display: "Email not valid."
• An alert popup must always appear in either case.