T3-007: Implement wallet authorize flow — connect wallet

Track: 3 — Solana Phone / Web3
Section: Phase B: Wallet Integration via MWA (56h)
Status: [ ] Todo
Repo: app-user
Branch: feature/T3-007-wallet-authorize-flow
Estimated Hours: 6h

Done When

User taps "Connect Wallet" -> MWA popup -> wallet app opens -> user approves -> public key returned to app

Notes

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