Skriipt/studydrive-pdfdownloader — reverse-engineered prompt

Build me a small Chrome style extension for StudyDrive that adds a clear Download PDF button on document pages. It should only work on StudyDrive document URLs, wait until the preview has loaded, then let me save the PDF that is already being shown in the page preview. I want this to feel simple and lightweight, with no build step, no extra services, no analytics, and nothing sent to outside servers.

Please keep it honest and limited to normal access. It should not try to get around logins, permissions, or any StudyDrive restrictions. Just help a logged in user download documents they are already allowed to view.

Make it easy to install as an unpacked extension in Chromium based browsers, with the button styled so it fits nicely on the page and works reliably. If anything about the site needs checking, look up the current StudyDrive page structure online first.