T4-006: TWA navigation — bottom tabs: Challenges, Leaderboard, Profile, Rewards

Track: 4 — Telegram Mini App
Section: Phase A: Bot & Mini App Foundation (24h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-006-twa-tab-navigation
Estimated Hours: 4h

Done When

Tab bar navigation works. Each tab renders placeholder. Telegram back button handled

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