Added the bookmarking feature. Hold ALT (Option on Mac) and click on any link in the dashboard and you'll be able to bookmark it. Your bookmarks will appear at the bottom left. The modals are keyboard-accessible. Holding ALT and clicking on a bookmark will allow you to edit it. You can change the order of bookmarks by clicking and dragging (a bit finnicky but it works). Your bookmarks are stored locally on a per-domain basis - as is typical for userscripts - so you'll have to copy the "pro-bookmarks" localStorage entry over to other Craft instance domains if you want to use the same bookmarks. Though, of course, since the base domain URL will differ, your links will need to be adjusted as well.
