extenhive/PinterestExtension ? reverse-engineered prompt

Build me a Chrome extension that can back up a Pinterest board with one click.

I want it to let me open a board and click something like Backup Board, then it should download all the pins it can find, save the full size images, and also capture the important details like the pin title, description, and the link to the original site when available. It should automatically organize everything into folders, with one folder for each board and separate folders for any sections inside that board.

I also want it to export a CSV file so I can see all the saved pin info in one place, including board name, section name, title, description, visit site link, and image filename. Make the popup simple and easy to use, with a clear start button and an option to include visit site links if I want it, even if that takes longer. If you need current Chrome extension docs, look them up online while building it.