#3136 feat(admin): expand onboarding v4 funnel stages

Summary (AI generated)

• expand only the onboarding v4 funnel to Intent, App name, App ID, App icon, Organization details, and Setup reached
• source the three new stages from console.capgo.app onboarding_step_viewed events and rank de-duplicated attempts by the furthest expanded stage
• keep v1-v3 funnels, daily conversion charts, welcome outcomes, and the journey graph behavior unchanged

Motivation (AI generated)

• expose where users drop off inside the app-creation portion of onboarding v4 instead of grouping those interactions into one App details stage

Business Impact (AI generated)

• make onboarding experiments measurable at each app-creation step while preserving historical v1-v3 reporting

Test Plan (AI generated)

• bun lint
• bun lint:backend
• bun run typecheck:backend
• bun run typecheck:frontend
• bun test:unit (2171 tests)
• CHOKIDAR_USEPOLLING=true bun run build

Summary by CodeRabbit

• New Features

  • Expanded the version 4 onboarding funnel from four to six stages: Intent, App name, App ID, App icon, Organization details, and Setup reached.
  • Updated the admin dashboard with new labels, colors, metrics, and a responsive six-column layout.
  • Preserved existing funnel behavior for earlier versions.

• Documentation

  • Added design and implementation documentation for the expanded onboarding funnel.