SignUp Screen
=============

The SignUp screen in SailPilot allows new users to register for an account. It presents a form for users to enter their personal details and create new credentials.

Layout and Widgets
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- **Text Fields**: The screen contains input fields for first name, last name, email, username, and password. Each field is managed by its own `TextEditingController`.
- **PrimaryButton**: A custom button used for initiating the sign-up process. It includes a shake animation (`ShakeWidget`) for visual feedback during certain conditions, like form validation failures.
- **Form Validation**: The form fields are validated in real-time, enabling the sign-up button when all fields are filled.
  
Registration Process
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- Upon tapping the sign-up button, the app validates the form and makes a request to the `AuthService` to register the user.
- If the registration is successful, the user's authentication state is updated and they are navigated to the `LandingPage`.
- In case of any errors (like duplicate email), the form shakes, and an error message is displayed using a `SnackBar`.

Dark Mode Support
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- The screen adapts its color scheme based on the current theme (light or dark mode).

Navigation to SignIn Screen
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- Includes a text button that navigates users back to the `SignIn` screen, in case they already have an account.

.. note:: The SignUp screen is designed to provide a user-friendly and efficient experience for new users joining SailPilot, with real-time validation and clear feedback mechanisms.