feat: add axios dependency for making HTTP requests

feat: implement DashboardPage with user greeting, theme toggle, and logout functionality

feat: add Input component with label, error handling, and customizable styles

feat: refactor routing structure to use React Router with authentication and public routes

feat: add Button component with customizable variants, sizes, and loading state

feat: add Alert component for displaying contextual messages with icons

style: update CSS variables and styles for improved theming and scrollbar customization

feat: add ProtectedRoute component for route protection based on authentication status

feat: add HomePage component with theme toggle and main content sections

feat: add RegisterPage component for user registration with form handling and validation

feat: add LoginPage component for user authentication with form handling and validation

feat: implement authStore using zustand for state management of user authentication and theme

feat: add validation schemas for login and registration using yup

feat: add authService for user authentication handling

feat: implement axios API service with request/response interceptors for authentication