T4-045: End-to-end testing — full user journey

Track: 4 — Telegram Mini App
Section: Phase E: Infrastructure & Polish (18h)
Status: [ ] Todo
Repo: all
Branch: feature/T4-045-e2e-testing
Estimated Hours: 4h

Done When

Test: open mini app -> join challenge -> track progress -> complete -> claim reward -> share -> invite friend. All steps work

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