This commit introduces a complete user authentication system, replacing the previous placeholder login page. The new flow includes signup, login, and OTP verification, all integrated with backend webhooks.
- Adds `AuthPage` to manage the view state between login, signup, and OTP forms.
- Implements `LoginForm` with support for both email and WhatsApp credentials.
- Implements `SignupForm` with password strength and confirmation validation.
- Adds `OtpForm` for two-factor verification after a successful signup.
- Integrates `axios` for making API calls to the backend webhooks.
- Updates styling with a new background, custom brand colors, and the Poppins font.
BREAKING CHANGE: The `LoginPage` component has been deleted and is replaced by the new `AuthPage` component. Any imports of `LoginPage` must be updated.
