Add favorites

[vnaumenko]

🚀 feat: Implement "Favorites" functionality

This PR completes the implementation of the "Add to Favorites" feature.

📋 Key Changes

• Toggle Logic: The Favorite button now functions as a toggle — adding the tool if it's missing, and removing it if it's already in the list.
• UI/UX:
  • Added visual feedback (star icon and Favorited / Remove text) for favorited tools.
  • The Favorites section now automatically hides (hidden attribute) when empty and appears when the first item is added.
  • Removed the hard limit on the number of favorite tools allowed.
• Styling: Added .active-fav class to visually highlight the active state of the favorite button.
• Refactoring:
  • Optimized loadTools to check favorite state during rendering.
  • Minor layout fixes (flex container for tools, button spacing).

🔧 Technical Details

• Data is persisted in localStorage under the key prism-favorites.
• The lists (both the main tools list and the favorites section) update reactively upon adding or removing an item.

[vnaumenko]

screencast.mp4