T4-032: "Challenge a Friend" Telegram share button

Track: 4 — Telegram Mini App
Section: Phase D: Viral Growth Mechanics (32h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-032-challenge-friend-share
Estimated Hours: 3h

Done When

Share button opens Telegram share picker. Pre-filled message with challenge link. Tracked for attribution

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