Rework the settings page shell with a slimmer sidebar, header-mounted org
switcher (with plan badges), branded identity orb, and a consolidated
Danger Zone popover. Split Billing & Subscription out of the Account tab
into a dedicated Billing tab, trim Account to profile + team members, and
remove the in-tab delete flow in favor of the sidebar control.
- Fix `authClient.apiKey.create()` returning undefined: better-auth resolves to `{ data, error }`, not the key directly. Use `res.data.key` (with `res.error` handling) in both `RaycastDetail` and `settings/integrations.tsx`.
- Extract `RaycastSetupModal` and reuse it across the nova home Raycast card and the Settings → Integrations Raycast modal. The new modal matches the plugins-connect design system (icon box, pill close, inset card with shared `InstallSteps`, install pill).
- Add `/settings/integrations` redirect page so `app.supermemory.ai/settings/integrations?q=raycast` lands on the Integrations tab and auto-opens the Raycast modal (the `?q=raycast` auto-trigger logic already existed; the route was the missing piece).
