CP-12074: Add ledger account

[Copilot]

Description

Ticket: CP-12074

Implements ledger account creation with multi-chain address derivation and mainnet/testnet support.

Changes:

• Ledger account creation: Derives EVM/C-Chain, Bitcoin, XP, and optionally Solana addresses from ledger device
• Mainnet/testnet handling: Pre-derives both network addresses simultaneously to avoid re-prompting users when toggling developer mode
  • Stores address pairs in new ledgerAddresses Redux state
  • AccountsService retrieves correct addresses based on current network mode
• UI improvements:
  • LedgerConnectionCaption component displays device connection instructions
  • "Add account" button conditionally shown when Avalanche app is detected on device
  • Solana "Enable" button appears when Solana app is open, triggers derivation flow
• State management:
  • New LedgerAddressesCollection type tracks mainnet/testnet addresses per account
  • setLedgerAddresses action populates addresses during account creation
  • addAccount thunk creates both network variants for ledger wallets

Screenshots/Videos

Include relevant screenshots or screen recordings of iOS and Android.

Testing

Dev Testing (if applicable)

• verify you can see the caption in wallet screen for ledger wallet to instruct user to turn on device and open avalanche app
• verify you can add account with evm/c-chain, bitcoin, and xp addresses populated
• verify you can enable and derive solana address in account address screen
• verify you can go through the solana connection flow when you press enable to derive solana address
• verify you can see the caption to instruct user to turn on device and open solana app in account address screen
• verify you see the correct mainnet/testnet addresses when you toggle developer mode

QA Testing (if applicable)

• Provide instructions for QA to test this feature thoroughly
• State expected behavior / acceptance criteria

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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