UI.7 A layout per app, finished: each app remembers its own, a switcher in the title bar, SuperCad Studio lists every layout

Owner: each app can use a different interface. FX.82 (0.9, partial) added a checkbox in Settings › Layout that keeps the pick for that app alone; the rest is open. Change: (1) the per-app pick is the default (cc-workspace:<slug> first, the global cc-workspace as the fallback), shown in Settings as "This app" / "Every app" with the app's name; (2) a workspace switcher in the title bar and the Vector/Drafting menu bars (the "2D Drafting ▾" drop-down of the owner's reference screenshot): the list of layouts with the person's own first, switching in place without a reload (the engine's decide() already does this; Work environments WS.24 still reload: they stop reloading when only the layout changes); (3) SuperCad Studio's manifest lists all seven layouts, not only docked, and its hosted apps follow the host's pick or keep their own (the guest rule stays: a guest never lays out the host's page); (4) ?workspace=<id> stays for one page. Help common/layout-ribbon, layout-toolbox and layout-own updated; words shell.ws.switch*.