A "AI seats" page (shadcn, on the design language): manage BYOK model connections (add +
test; the key is write-only), create seats on a team, and configure an agent per seat — name,
the color-graded autonomy dial (draft slate / gated indigo / auto teal), a model connection,
skill toggles from the registry, and docs. Navigable AppShell sidebar (Board / AI seats).
Verified: client `npm run build` clean (1890 modules, tsc + vite).