T3-046: Error handling for Solana transactions

Track: 3 — Solana Phone / Web3
Section: Infrastructure & Testing (20h)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T3-046-solana-error-handling
Estimated Hours: 3h

Done When

Handle: network errors, insufficient SOL, transaction timeout, duplicate mint attempts. User-friendly error messages

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