T4-036: Mini app onboarding — first-time user flow

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-036-onboarding-flow
Estimated Hours: 3h

Done When

First open: welcome screen -> explain challenges -> connect health data -> join first challenge. Under 30 seconds

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