ui: set up routing, pages, and initial design

[Nyumat]

This pull request includes significant updates to the file upload and management features, as well as improvements to the overall user interface. The most important changes include adding new components for better UI consistency, enhancing the file upload page with drag-and-drop functionality, and updating the file management page with sorting and filtering capabilities.

File Management Enhancements:

• src/app/files/page.tsx: Added new components (Badge, Card, Input, Progress, Select) and icons for better UI. Introduced filtering and sorting for files and added loading states.

File Upload Page Improvements:

• src/app/upload/page.tsx: Added drag-and-drop file upload functionality, improved form handling, and updated UI components (Card, Progress).

Configuration Updates:

• next.config.ts: Configured image domains to allow images from lh3.googleusercontent.com.

Layout and Navigation:

• src/app/layout.tsx: Added a Navbar component to the root layout for consistent navigation across the application.

Authentication Page Update:

• src/app/page.tsx: Consolidated sign-in, sign-out, and theme toggle into a single AuthPage component for better organization.

Screenshots