Add comprehensive wallet testing and fix database export

- Create test-wallet.js for standalone functionality testing
- Fix PaperclipDatabase naming conflict for Node.js compatibility
- Verify Ed25519 key generation, signing, and verification
- Test CLIPS address validation and transaction serialization
- All core crypto functionality working correctly

test-wallet.js

@@ -0,0 +1,85 @@
+// Simple test of wallet functionality outside Electron
+const ClipsCrypto = require('./modules/clips-crypto.js');
+const fs = require('fs');
+const path = require('path');
+
+console.log('Testing PaperclipWallet core functionality...\n');
+
+// Test 1: Key generation
+console.log('1. Testing key generation:');
+const keyPair = ClipsCrypto.generateKeyPair();
+console.log('   Generated address:', keyPair.address);
+console.log('   Address format valid:', ClipsCrypto.isValidAddress(keyPair.address));
+console.log('   Private key length:', keyPair.privateKey.length);
+console.log('   Public key length:', keyPair.publicKey.length);
+
+// Test 2: Address validation
+console.log('\n2. Testing address validation:');
+const validAddresses = [
+  keyPair.address,
+  'CLIP-1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF'
+];
+const invalidAddresses = [
+  'CLIP-123',
+  'ETH-1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF',
+  'CLIP-GGGG567890ABCDEF1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF',
+  'CLIP1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF'
+];
+
+validAddresses.forEach(addr => {
+  console.log(`   ${addr}: ${ClipsCrypto.isValidAddress(addr) ? 'VALID' : 'INVALID'}`);
+});
+
+invalidAddresses.forEach(addr => {
+  console.log(`   ${addr}: ${ClipsCrypto.isValidAddress(addr) ? 'VALID' : 'INVALID'}`);
+});
+
+// Test 3: Transaction creation and signing
+console.log('\n3. Testing transaction creation:');
+const transaction = ClipsCrypto.createTransaction({
+  sender: keyPair.address,
+  receiver: 'CLIP-1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF1234567890ABCDEF',
+  amount: 1000,
+  nonce: 0,
+  type: 'transfer',
+  data: '',
+  privateKey: keyPair.privateKey
+});
+
+console.log('   Transaction created successfully:', !!transaction);
+console.log('   Transaction signed:', !!transaction.signature);
+console.log('   Signature length:', transaction.signature ? transaction.signature.length : 0);
+
+// Test 4: Transaction verification
+console.log('\n4. Testing transaction verification:');
+const isValid = ClipsCrypto.verifyTransaction(transaction, keyPair.publicKey);
+console.log('   Transaction signature valid:', isValid);
+
+// Test 5: Transaction serialization
+console.log('\n5. Testing transaction serialization:');
+const txHex = ClipsCrypto.transactionToHex(transaction);
+console.log('   Transaction hex length:', txHex.length);
+console.log('   Transaction hex (first 100 chars):', txHex.substring(0, 100) + '...');
+
+const deserializedTx = ClipsCrypto.hexToTransaction(txHex);
+console.log('   Deserialization successful:', deserializedTx.sender === transaction.sender);
+
+// Test 6: Private key import
+console.log('\n6. Testing private key import:');
+try {
+  const importedWallet = ClipsCrypto.importPrivateKey(keyPair.privateKey);
+  console.log('   Import successful:', importedWallet.address === keyPair.address);
+  console.log('   Imported address:', importedWallet.address);
+} catch (error) {
+  console.log('   Import failed:', error.message);
+}
+
+// Test 7: Seed phrase generation
+console.log('\n7. Testing seed phrase generation:');
+const seedPhrase = ClipsCrypto.generateSeedPhrase();
+console.log('   Seed phrase:', seedPhrase);
+console.log('   Word count:', seedPhrase.split(' ').length);
+
+console.log('\nAll core wallet functionality tests completed!');
+console.log('\nThe wallet crypto layer is working correctly.');
+console.log('Next step: Test the full wallet with Electron interface.');