Wire PostHog funnel events (started, step viewed/completed, mode, workspace, sources, ingest, team, completed) across the brain onboarding flow, and drop stale pre-brain event defs from analytics.ts.
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**Session Details**
- Session: [View Session](https://supermemory.us1.vorflux.com/agent-sessions/5b48bbe4-422a-4577-b6bf-fd9416a6846b)
- Requested by: Sreeram Sreedhar (sreeram@supermemory.com)
- Address comments on this PR. Add `(aside)` to your comment to have me ignore it.
Fixes the onboarding source-integrations step: corrects connector behavior, applies plan-based gating to connectors, and polishes the integrations layout.
feat(web): make brain onboarding the default flow
- Replace legacy /onboarding with the brain onboarding flow (about -> sources -> ingest -> team -> done)
- Add brain-home dashboard page and widgets
- Old /onboarding/brain deep links fall through to the existing catch-all redirect
feat(onboarding): create org on About step + remove skip
- Create the organization on About -> Continue (authClient.organization.create + setActiveOrg), persisting brain context to org metadata; fixes the no-org redirect loop
- Show a Creating… state on Continue while the org is created
- Remove Skip on the required About step (name + workspace)
- Add generateOrgSlug/generateUsername helpers to onboarding-brain/types
