🔄 Enhance User Experience with UI Improvements

[mlamina]

This pull request enhances the user experience by improving the UI across various components of the Arcane Studio. These changes aim to make the interface more intuitive and visually appealing.

• UI Enhancements

  • Add rounded corners to hero sections in multiple templates for a modern look.
  • Implement a blinking animation for interactive elements in base.html.
  • Introduce clickable cards in studio_home.html for better navigation.

• Content Updates

  • Update hero section subtitles in chat_preview.html and pr_manager_preview.html to better describe functionalities.
  • Add descriptive content and login buttons to tool previews in tasks_preview.html.

• New Features

  • Add a "How it Works" page with tool descriptions in how_it_works.html.
  • Implement a modal for the login page in login.html to streamline user authentication.

These updates collectively aim to improve the overall user interaction and accessibility of the Arcane Studio platform.