Enatega Customer Application: When new user is signing-in , sign-up input fields allowing to enter Numbers instead of Letters.

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Describe the bug
The Sign-Up input fields (e.g., First Name, Last Name) are allowing numbers, which is incorrect.

To Reproduce
Steps to reproduce the behavior:

Go to 'Enatega Customer Application'.
Create a new account on customer application.
Now the new form will open.
Fill up the required fields, now put numbers in Name field.

Expected behavior

Name fields should only allow letters (A-Z, a-z) and possibly spaces.
Numbers and special characters (e.g., 123, @, #, !) should not be accepted.

Smartphone (please complete the following information):

Device: [e.g. infinix hot 50]
OS: [e.g. Android]
Browser [e.g. Application]
Version [e.g. Latest]

Start in the Enatega Customer Application by reproducing the issue through account creation and inspecting the sign-up form's First Name and Last Name fields. Confirm the fields reject numbers and the listed special characters while accepting letters and spaces, then verify the corrected behavior on the sign-up flow.

Written by the indexing model from the issue text.