Add mobile transaction detail screen

TRANSACTION_DETAIL_QUICK_START.md

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+# Transaction Detail Screen - Quick Start Guide
+
+## 🎯 What Was Implemented
+
+A comprehensive transaction detail screen that displays full information about individual transactions with proper handling of edge cases.
+
+## 📍 Location
+
+**Screen:** `app/transaction/[id].tsx`  
+**Feature Module:** `src/features/transactions/`  
+**Tests:** `__tests__/transactionDetail.test.tsx`
+
+## ✨ Key Features
+
+### 1. Transaction Information Display
+- ✅ Amount with direction (+/-)
+- ✅ Transaction status (Successful/Pending/Failed)
+- ✅ Sender and recipient addresses
+- ✅ Transaction hash
+- ✅ Memo (when present)
+- ✅ Timestamp
+- ✅ Asset type
+
+### 2. Interactive Features
+- ✅ Copy to clipboard (hash, addresses, memo)
+- ✅ Open in Stellar Explorer
+- ✅ Contact name resolution
+- ✅ Visual copy feedback
+
+### 3. Error Handling
+- ✅ Missing data gracefully handled
+- ✅ Transaction not found state
+- ✅ Clipboard failure alerts
+- ✅ Explorer unavailability handling
+
+## 🚀 How to Use
+
+### Navigate to Detail Screen
+```typescript
+// From transaction list
+import { useRouter } from 'expo-router';
+
+const router = useRouter();
+router.push(`/transaction/${transactionId}`);
+```
+
+### Access Transaction Helpers
+```typescript
+import { 
+  getTransactionStatus, 
+  formatTransactionAmount,
+  getTransactionHash 
+} from '@/features/transactions';
+
+const status = getTransactionStatus(transaction);
+const amount = formatTransactionAmount(transaction, userPublicKey);
+const hash = getTransactionHash(transaction);
+```
+
+## 🧩 Component Structure
+
+```
+TransactionDetailScreen
+├── Hero Section
+│   ├── Direction Icon
+│   ├── Amount Display
+│   ├── Date
+│   └── Status Badge
+├── Details Card
+│   ├── Type Row
+│   ├── Status Row
+│   ├── Memo Row (conditional)
+│   ├── Hash Row
+│   ├── Sender Row
+│   └── Recipient Row
+└── Explorer Section (conditional)
+    └── Explorer Button or Unavailable Message
+```
+
+## 📊 Data Fields Handled
+
+### Required Fields
+- `id` - Transaction identifier
+- `amount` - Transaction amount (fallback: 'N/A')
+- `from` - Sender address (conditionally shown)
+- `to` - Recipient address (conditionally shown)
+
+### Optional Fields
+- `hash` or `transaction_hash` - Transaction hash
+- `created_at` or `createdAt` or `timestamp` - Date
+- `memo` - Memo text
+- `memo_type` - Memo type (text, id, hash, return)
+- `transaction_successful` - Success boolean
+- `is_pending` - Pending boolean
+- `asset` - Asset code (default: 'XLM')
+
+## 🎨 Status States
+
+### Successful ✓
+```typescript
+{
+  transaction_successful: true,
+  is_pending: false
+}
+```
+- Green checkmark icon
+- "Successful" label
+
+### Pending ⏱
+```typescript
+{
+  is_pending: true
+}
+```
+- Yellow clock icon
+- "Pending" label
+
+### Failed ✗
+```typescript
+{
+  transaction_successful: false
+}
+```
+- Red X icon
+- "Failed" label
+
+## 🧪 Running Tests
+
+```bash
+# Run all tests
+npm test
+
+# Run transaction detail tests only
+npm test transactionDetail.test.tsx
+
+# Run with coverage
+npm test -- --coverage
+```
+
+## 📝 Example Transaction Data
+
+```typescript
+const exampleTransaction = {
+  id: 'tx123',
+  from: 'GABCD...XYZ',
+  to: 'GXYZ...ABC',
+  amount: '100.0000000',
+  asset: 'XLM',
+  created_at: '2024-01-15T10:30:00Z',
+  hash: 'abc123...def456',
+  memo: 'Payment for services',
+  memo_type: 'text',
+  transaction_successful: true,
+  is_pending: false,
+};
+```
+
+## 🔗 Integration Points
+
+### From History Screen
+```typescript
+// app/(tabs)/history.tsx
+<TransactionListItem
+  transaction={tx}
+  currentPublicKey={publicKey}
+  onPress={(tx) => router.push(`/transaction/${tx.id}`)}
+/>
+```
+
+### With Contact Store
+```typescript
+import { useAppStore } from '@/store/appStore';
+import { resolveAddressLabel } from '@/utils/contacts';
+
+const contacts = useAppStore((state) => state.contacts);
+const label = resolveAddressLabel(address, contacts);
+```
+
+### With Explorer
+```typescript
+import { getExplorerTxUrl } from '@/services/stellar';
+
+const explorerUrl = getExplorerTxUrl(transactionHash);
+if (explorerUrl) {
+  await Linking.openURL(explorerUrl);
+}
+```
+
+## 🛠 Helper Functions
+
+### Status Detection
+```typescript
+import { getTransactionStatus } from '@/features/transactions';
+
+const status = getTransactionStatus(transaction);
+// Returns: 'successful' | 'pending' | 'failed'
+```
+
+### Direction Check
+```typescript
+import { isSentTransaction } from '@/features/transactions';
+
+const isSent = isSentTransaction(transaction, userPublicKey);
+// Returns: true if user sent this transaction
+```
+
+### Data Validation
+```typescript
+import { validateTransactionData } from '@/features/transactions';
+
+const { isValid, missingFields } = validateTransactionData(transaction);
+// Returns validation result with missing field list
+```
+
+## 🐛 Common Issues & Solutions
+
+### Issue: Transaction not found
+**Solution:** Ensure transaction exists in wallet store and ID is correct
+
+### Issue: Explorer link not working
+**Solution:** Check network configuration and hash availability
+
+### Issue: Copy not working
+**Solution:** Verify expo-clipboard permissions and installation
+
+### Issue: Date showing "Unknown date"
+**Solution:** Check date field format (should be ISO 8601)
+
+## 📚 Related Documentation
+
+- [Transaction Feature README](./src/features/transactions/README.md)
+- [Implementation Details](./docs/transaction-detail-implementation.md)
+- [Stellar Service](./src/services/stellar.ts)
+- [Wallet Store](./src/store/walletStore.ts)
+
+## 🎓 Best Practices
+
+1. **Always handle missing data** - Use optional chaining and fallbacks
+2. **Validate before display** - Check data exists before rendering
+3. **Provide user feedback** - Show loading, error, and success states
+4. **Use helper functions** - Don't duplicate transaction logic
+5. **Test edge cases** - Missing fields, empty strings, null values
+
+## 💡 Quick Tips
+
+- Use `getTransactionHash()` instead of direct field access
+- Use `formatTransactionDate()` for consistent date formatting
+- Use `validateTransactionData()` before critical operations
+- Check explorer URL availability before showing link
+- Always provide copy feedback to users
+
+---
+
+**Need Help?** Check the full documentation in `src/features/transactions/README.md`