UI/UX fix

<img width="681" height="1060" alt="Image" src="https://github.com/user-attachments/assets/68bf1f8e-20a2-4cdc-85f2-b254b9cbba31" />

- Make place holder for username as elephant (not elephant_user) as it only supports alphanumeric
- keep Display Name (1st) then Username (2nd) then password (3rd) as most user is getting confused
- Remove the shield icon and put elephant logo (our app logo)
