Implement OIDC for User Authentication

[TemaDeveloper]

This task is to build the client-side authentication flow using the OpenID Connect (OIDC) standard. This will allow the frontend to handle user login and receive a secure ID Token containing the user's profile information.

Tasks:

• Integrate an OIDC client library and configure it to connect with the authorization server.

• Implement the login and callback routes to handle the OIDC Authorization Code Flow.

• Securely store the ID Token and access_token upon successful authentication.

• Update UI components to display user information from the decoded ID Token.