refactor: Use generateWalletId() for single source of truth

Replaces inline randomBytes(16).toString('hex') calls in wallet-store.ts
with the centralized generateWalletId() utility function to eliminate
code duplication and maintain consistency.

Changes:
- Import generateWalletId from key-generation.ts
- Replace wallet ID generation in importWallet() (line 122)
- Replace wallet ID generation in importLedgerWallet() (line 165)

This ensures all wallet IDs are generated using the same method
across the codebase.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: katspaugh

src/storage/wallet-store.ts

@@ -5,6 +5,7 @@ import type { Wallet, WalletStore, PrivateKeyWallet, LedgerWallet } from '../typ
 import { WalletError } from '../utils/errors.js'
 import { isValidPrivateKey, normalizePrivateKey } from '../utils/validation.js'
 import { checksumAddress } from '../utils/ethereum.js'
+import { generateWalletId } from '../utils/key-generation.js'
 
 // Simple encryption for private keys
 // Note: For production, consider using OS keychain (keytar/keychain)
@@ -118,7 +119,7 @@ export class WalletStorageService {
     }
 
     // Create wallet metadata
-    const walletId = randomBytes(16).toString('hex')
+    const walletId = generateWalletId()
     const wallet: PrivateKeyWallet = {
       type: 'private-key',
       id: walletId,
@@ -161,7 +162,7 @@ export class WalletStorageService {
     }
 
     // Create wallet metadata
-    const walletId = randomBytes(16).toString('hex')
+    const walletId = generateWalletId()
     const wallet: LedgerWallet = {
       type: 'ledger',
       id: walletId,