feat(mobile): wire SDK and port WalletProvider with secure session persistence

[Big-Rahm]

Overview

This PR wires the @veil/sdk (useInvisibleWallet) into the mobile app and ports the WalletProvider from the web wallet, adapted for React Native.

Unlike the web wallet (which keeps the signer keypair in React state only), the mobile provider persists the session in expo-secure-store so it survives the app being backgrounded or killed by the OS. The SDK credentials (key ID, public key, address) are persisted via AsyncStorage (configured as the SDK's StorageAdapter).

Related Issue

Closes #443

Changes

Mobile WalletProvider

• [ADD] frontend/mobile/components/WalletProvider.tsx

  • Wraps useInvisibleWallet(walletConfig) with AsyncStorage as the storage adapter
  • Exposes session, setSession, wallet, clearSession via React context
  • Hydrates session from expo-secure-store on mount (reads wallet_address + signer_secret)
  • Persists/clears session (fee-payer signer keypair) in OS keychain via expo-secure-store
  • Blocks render until hydration is complete so children always see a consistent session state
  • Exports useWallet() hook matching the web interface

• [MODIFY] frontend/mobile/app/_layout.tsx

  • Imported and mounted <WalletProvider> wrapping the navigation Stack and WalletConnectApprovalModal

SDK / Network Wiring

• [MODIFY] frontend/mobile/lib/network.ts

  • Added factoryContractId to VeilNetwork type and both network definitions (testnet/mainnet)
  • Added walletConfig export (mirrors frontend/wallet/lib/network.ts)

• [MODIFY] frontend/mobile/lib/walletStore.ts

  • Added setSignerSecret(secret) for persisting the fee-payer secret to expo-secure-store
  • Removed duplicate getWalletAddress() declaration

Dependencies

• [MODIFY] frontend/mobile/package.json

  • Added invisible-wallet-sdk: file:../../sdk dependency

• [MODIFY] frontend/mobile/tsconfig.json

  • Added path aliases for @veil/sdk and other @veil/* modules pointing to SDK source

Verification Results

npm install  - success
npx tsc --noEmit - success (no errors in changed files)

Acceptance Criteria	Status
useWallet() returns a live useInvisibleWallet(walletConfig) from any screen	Yes
WalletProvider exposes session, setSession, wallet, clearSession	Yes
Session persists in expo-secure-store across app restart	Yes
Portal/port structure matches web WalletProvider.tsx	Yes

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