Add Alert Messages to Signup and Login Page

[tech-hao]

This pull request adds some alert messages to the signup and login pages.

Signup Page:

• Added a success message for successful account registration. The message will display "Account Registration Successful!" when the user register an account successfully.

  Login Page:

• Added a failure message for login attempts with incorrect user data. The message will display the specific reason for the login failure, such as "Network error occurred" or "Wrong password."
• Added a success message for successful login attempts. The message will display "Successfully logged in" when the user log in with correct data. These changes aim to improve the user experience by providing clear feedback on the signup and login processes.

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[tech-hao]

Thank you, I am still a beginner in the open source community and still learning. But I will do my best to do it well.