T4-044: Error handling and offline states

Track: 4 — Telegram Mini App
Section: Phase E: Infrastructure & Polish (18h)
Status: [ ] Todo
Repo: telegram-mini-app
Branch: feature/T4-044-error-handling-offline
Estimated Hours: 3h

Done When

Network errors show retry button. Offline: show cached data with "Offline" indicator. No crashes

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