T4-019: Share challenge results — generate shareable card

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-019-share-challenge-results
Estimated Hours: 3h

Done When

On challenge complete, generate result card: rank, stats, Sellwyse branding. Share to Telegram chats

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