Add: Set Up User Authentication, Form validations, login, logout, sig…

[Aditya-JOSH]

Description

This PR sets up the entire user authentication system integrating a React frontend with a Rails API backend. It includes secure login, logout, and registration flows with client-side validations, API service integration, and enhanced UX through error handling and password strength enforcement.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Changes Made

• Created a centralized React AuthContext using Context API to manage user authentication state throughout the app.
• AuthProvider component stores and manages user data, tokens, error and loading states with hooks like useState and useCallback.
• Implemented login, register, logout, and session check functions in AuthContext for API integration with backend auth endpoints.
• Exposed authentication functions and state (user, error, loading, isAuthenticated) via AuthContext.Provider to child components.
• Provided a custom useAuth hook to simplify context consumption across the application.

Testing

Describe how you tested these changes:

• Unit tests added/updated
• Integration tests pass
• Manual testing performed

Screenshots (if applicable)

Related Issues

Closes #8

[Aditya-JOSH]

@Limeload Could you please review this PR and assign me this issue #23 ?