CP-13334: Refactor Ledger device info storage with Zustand store

[Copilot]

Description

Ticket: CP-13334

Replaces BiometricsSDK-based Ledger device info retrieval with a persisted Zustand store for better performance and cleaner architecture. This enables reusing AppConnectionScreen for both onboarding and adding accounts.

Key Changes

• New Zustand store (packages/core-mobile/app/new/features/ledger/store.ts)

  • Persists Ledger device info (device ID, name, derivation path) mapped by wallet ID
  • Replaces async BiometricsSDK lookups with synchronous store access
  • Auto-syncs on wallet creation, update, and deletion

• Removed hooks

  • useObserveLedgerState - Eliminated app polling from WalletCard (no longer gates "Add Account")
  • useLedgerDeviceInfo - Replaced with useLedgerWalletMap().getLedgerInfoByWalletId()

• Unified AppConnectionScreen

  • Now handles both onboarding (AppConnectionOnboardingScreen) and adding accounts (AppConnectionAddAccountScreen)
  • Both screens pass device info and completion handlers to shared base screen

• Simplified LedgerSetupContext

  • Focuses only on setup flow state (device connection, derivation path, wallet creation status)
  • Device info now managed separately in store

Migration

Store automatically persists to MMKV. Existing wallets will populate the store on next device connection.

Screenshots/Videos

Include relevant screenshots or screen recordings of iOS and Android.

Testing

Dev Testing (if applicable)

1. Onboarding flow
   • Create new Ledger wallet → verify device info persists across app restarts
2. Add account flow
   • Add account to existing Ledger wallet → verify reuses stored device info
   • Test with device disconnected → verify shows loading state
3. Wallet deletion
   • Delete Ledger wallet → verify store entry removed
4. Transaction signing
   • Sign transaction → verify retrieves correct device from store

QA Testing (if applicable)

• Verify Ledger onboarding and account addition flows work identically
• Confirm device reconnection prompts appear when device info missing
• Test wallet deletion clears associated device data

Checklist

Please check all that apply (if applicable)

• I have performed a self-review of my code
• I have verified the code works
• I have included screenshots / videos of android and ios
• I have added testing steps
• I have added/updated necessary unit tests
• I have updated the documentation

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