T3-012: USDC SPL token balance display

Track: 3 — Solana Phone / Web3
Section: Phase B: Wallet Integration via MWA (56h)
Status: [ ] Todo
Repo: app-user
Branch: feature/T3-012-usdc-balance-display
Estimated Hours: 4h

Done When

Fetch USDC balance from Solana RPC for connected wallet. Display in wallet screen. Auto-refresh every 30s

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