feat(wallet): add Ledger & WalletConnect multi-wallet support (#34)

[Peace-001]

• lib/stellar-wallet-kit.ts

  • Add LedgerModule and WalletConnectModule to kit modules array
  • Export LEDGER_ID, WALLET_CONNECT_ID, WalletConnectTargetChain
  • Export TESTNET_PASSPHRASE / MAINNET_PASSPHRASE constants
  • Add isHardwareWalletSelected() and isWalletConnectSelected() helpers
  • signTransaction: network passphrase guard for Ledger (rejects unknown network before hitting HID transport)
  • signTransaction: friendly error messages for USB/timeout/rejected errors
  • WalletConnect project ID from NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID

• components/wallet-provider.tsx

  • Session restoration on mount via refresh()
  • Heartbeat: 8 s for hardware wallets, 30 s for extension wallets
  • navigator.usb connect/disconnect event listeners for immediate Ledger unplug detection
  • Hardware wallet network passphrase mismatch validation (calls kit.getNetwork() after connect and via effect)
  • Red banner UI alert when Ledger is on wrong network passphrase
  • isHardwareWallet / isWalletConnect flags exposed in context
  • stopHeartbeat() called on disconnect and session expiry
  • syncModuleFlags() on connect/openWalletPicker to keep flags current

• components/freighter-connect.tsx

  • WalletTypeBadge: amber '⬡ LEDGER' badge for hardware wallets, blue '◈ WC' badge for WalletConnect sessions
  • Status dot: amber for Ledger, blue for WalletConnect, violet default
  • Context-aware connecting label: 'Opening Ledger…' / 'Opening QR…'
  • Import cn from @/lib/utils

• .env.local.example

  • Document NEXT_PUBLIC_WALLETCONNECT_PROJECT_ID variable

Closes #34

[drips-wave]

@Peace-001 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits