Adds a dismissible Company Brain card to the dashboard header slot and a permanent entry in the profile menu for users whose org has no company brain, both linking to team onboarding.
Onboarding now honours ?mode=team so a personal-domain email arriving from those CTAs isn't routed to personal onboarding.
Fixes ENG-1132
New /brain route creates the org straight from signup and redirects into the Slack install, so onboarding has no domain-confirmation step. Returning from OAuth shows an Open Slack handoff instead of a toast.
Also models the terminal research error state: polling stops, the UI retries once, and the docked header no longer gates Continue on research finishing.
- Confirm-domain step, then live research transcript + action rail
- Poll research status; client-side force-start fallback
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**Session Details**
- Session: [View Session](https://supermemory.us1.vorflux.com/agent-sessions/4f4c1321-9b65-4dac-9906-8b78c4c32926)
- Requested by: Unknown
- Address comments on this PR. Add `(aside)` to your comment to have me ignore it.
- Promote integrations from ?view=integrations to real /integrations and nested /integrations/[card] routes; the page body is shared via AppExperience and useViewMode is path-aware.
- Legacy ?view= URLs (and /settings/integrations) redirect to the new routes for back-compat; middleware/ensure-workspace allow the public routes.
- Add ?connect=<plugin|provider> deeplink that opens a card's connect modal instantly with a loading state (e.g. Hermes API key).
