sarvan-2187/Bookmrk — reverse-engineered prompt

Build me a clean local first bookmark manager called Bookmrk.

I want it to work as a modern browser extension and also fall back to normal local storage if needed. Users should be able to create pages and boards, save bookmarks into them, and arrange boards visually in a 4 column canvas layout by dragging them around, including into empty columns.

Please include a quick save shortcut, Ctrl or Cmd plus Shift plus Y, that saves the current page into a Quick Saves board and creates that board automatically if it doesn’t exist. Add bookmark cards that open links, board menus for rename, delete, add bookmark, and summon all links, plus page rename and delete with protection so the last page can’t be removed.

Use a polished themeable UI with centered modals, toast messages instead of browser alerts, compact mode, optional descriptions, background image URL or upload, JSON import and export, and optional Chrome bookmarks import when running as an extension. Look up current extension docs online if you need to.