feat: Complete Jupiter-style trading interface with navigation integration

Major accomplishments:
- Fully restored complete Jupiter Perps-style trading interface
- Added Chart Trading page to main navigation menu with 📈 icon
- Complete real trading functionality with live wallet balances
- Professional leverage controls (1x-100x) with risk warnings
- Working token selection dropdowns with balance display
- Real-time position management and P&L tracking
- Integration with backend APIs for DEX and perp trading
- Stop Loss and Take Profit functionality
- Live market data and price updates

- Clean, modern UI matching Jupiter's design aesthetic
- Symbol selection dropdown with live prices and % changes
- Advanced leverage slider with quick-select buttons
- Trade form with 'You're paying' and 'You're receiving' sections
- MAX button for using full token balance
- Real trade execution with confirmation alerts
- Position table with close functionality
- Risk warnings for high leverage positions

- Added Chart Trading link between Trading and Automation
- Professional icon and description
- Maintains consistent styling with other nav items
- Direct access to advanced trading interface

Ready for production use with real trading capabilities.

test-trade-validation.js

@@ -0,0 +1,39 @@
+// Quick test to verify the trade validation fix
+const testTradeValidation = async () => {
+  console.log('🧪 Testing trade validation with fixed amountUSD...')
+  
+  const tradeData = {
+    symbol: 'USDCUSD',
+    side: 'BUY', 
+    amount: 5,
+    amountUSD: 5, // This should be passed through correctly now
+    useRealDEX: false, // Use simulation for testing
+    tradingPair: 'USDCUSD/USDC'
+  }
+  
+  console.log('🚀 Sending test trade:', tradeData)
+  
+  try {
+    const response = await fetch('http://localhost:3001/api/trading/execute-dex', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify(tradeData)
+    })
+    
+    const result = await response.json()
+    
+    console.log('📊 Response status:', response.status)
+    console.log('📊 Response body:', result)
+    
+    if (response.ok) {
+      console.log('✅ Trade validation fix is working!')
+    } else {
+      console.log('❌ Trade validation still has issues:', result.message)
+    }
+    
+  } catch (error) {
+    console.error('❌ Test failed:', error)
+  }
+}
+
+testTradeValidation()