FX.17 Account pages: side panel redesigned

Owner 2026-11-04 on /account/developers: 'left panel design it better'. The panel was a flat list of up to 12 links floating on the page grid, and on a short window its sticky list could leave the last links out of reach. Now it is a ruled box like the settings sections, with the account's address at the top and links grouped as Account, Cloud, Library and add-ons, Programs and Bidding, in the same order as before; a group with nothing to show is not drawn. The current page has a tint and a blue bar, and the panel scrolls by itself when it is taller than the window. Phones keep the wrapping tabs. Checked on the account pages at desktop and phone sizes, in Paper and Model. Not checked with SuperCad Studio and Your students showing together (12 links).