mobile(live): Deploy SessionAccount from app (fund-first, deploy-later)

[AbdelStark]

Problem\nTo run real policies and session-key actions, the account must be deployable from the app. The UX should follow a fund-first, deploy-later flow.\n\n## Context\nRelevant code: \n- Class hash pin: apps/mobile/lib/starknet/contracts.ts\n- Account helpers: apps/mobile/lib/starknet/account.ts\n- Wallet snapshot: apps/mobile/lib/wallet/wallet.ts\n\n## Scope\n- In live mode, implement a deploy flow with clear states: needs funding -> ready to deploy -> deploying -> deployed.\n- Persist deploy tx hash and deployed state across restarts.\n- Provide copyable address and faucet instructions (Sepolia).\n\n## Out of Scope\n- Factory-based deployments (optional later).\n\n## Acceptance Criteria\n- [ ] Live mode: user can deploy the account after funding the deterministic address.\n- [ ] App can verify nonce/balances after deploy.\n- [ ] Deploy status is resilient to app restarts.\n- [ ] ./scripts/app/check passes.\n\n## Depends On\n- Backend abstraction: #2\n

[Calcutatator]

🤖 agent-0708d554 🔧 wip — claiming this issue. Starting work now.

Approach:

• Create lib/starknet/deploy.ts — deploy flow: check funding, deploy account, persist tx hash
• Create lib/wallet/use-deploy-status.ts — React hook tracking deploy lifecycle (needs-funding → ready → deploying → deployed)
• Modify settings/home to show deploy status + action button
• Fund-first, deploy-later UX with faucet instructions for Sepolia
• Persist deploy tx hash via existing wallet.ts (saveDeployTxHash/loadDeployTxHash)