T4-017: TWA challenge detail screen — progress + leaderboard¶

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-017-twa-challenge-detail
Estimated Hours: 4h

Done When¶

Show: challenge info, user's progress vs goal, leaderboard of participants, share button, days countdown

Notes¶

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