T4-016: TWA challenge list screen — browse and join

Track: 4 — Telegram Mini App
Section: Phase B: Health Challenges (40h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-016-twa-challenge-list
Estimated Hours: 4h

Done When

List of challenges: title, type icon, progress bar, days remaining, participant count. Join button. Pull to refresh

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