feature: implement policies page for user account creation (TCS-15)

[thulani2418]

This PR introduces the Policies Page in the authentication flow for the Traces app

📌 Description

The page displays an overview of the Terms of Service and Privacy Policy, ensuring users acknowledge the terms before creating an account.Users must explicitly agree to these terms by selecting a checkbox before the "Create Account" button becomes enabled.

📒 Summary of Changes

• Displayed a welcome message explaining the purpose of the page
• Terms of Service Overview
• Privacy Policy Overview
• Included an icon attachment next to each policy section
• a checkbox for user agreement before account creation.
• Disabled the "Create Account" button by default until the checkbox is selected.

📱 View Screenshots

Policies Page (Button Disable)	Policies Page (Button Enabled)

[lithika-damnod]

There's an issue with code formatting. You can reformat the code by running the command dart format lib/pages/authentication/views/policies_page.dart on the terminal.

[thulani2418]

There's an issue with code formatting. You can reformat the code by running the command dart format lib/pages/authentication/views/policies_page.dart on the terminal.

done