Update Save Functionality to Save all Favorited Drinks to Local Storage

[NickDavis07]

• Update the save functionality to store all favorited drinks in local storage.
• Each favorited drink is saved as a unique item in local storage.
• Saved drinks persist across sessions, so users can view their favorites after refreshing or reopening the page.
• When a user clicks the "favorite" button on a drink:
  • If the drink is not already favorited, it is saved to local storage as a favorite.
  • If the drink is already favorited, it is removed from local storage (unfavorited).

[NickDavis07]

This was largely completed by Pablo in a separate ticket.