Fix position sizing and improve automation UI

Major fixes:
- Fixed position size calculation: converts USD amount to SOL tokens properly
- Fixed insufficient collateral error by using correct position sizing
- Added proper TP/SL parameter passing through automation chain
- Enhanced position sizing UI with balance percentage slider

Position Sizing Fixes:
- Convert 2 USD to SOL tokens using current price (2 ÷ 97.87 = ~0.162 SOL)
- Remove incorrect 32 SOL token calculation (was 32,000,000,000 base units)
- Use USD position value for perpetual futures trading correctly

Take Profit & Stop Loss Improvements:
- Pass TP/SL percentages from config through automation → trade → drift chain
- Use actual config percentages instead of hardcoded 2:1 ratio
- Enable proper risk management with user-defined TP/SL levels

UI/UX Enhancements:
- Remove redundant 'Risk Per Trade (%)' field that caused confusion
- Remove conflicting 'Auto-Size (%)' dropdown
- Keep clean balance percentage slider (10% - 100% of available balance)
- Simplify position sizing to: Balance % → Position Size → Leverage → TP/SL

Technical Changes:
- Update Drift API position calculation from SOL tokens to USD conversion
- Fix automation trade route parameter passing
- Clean up AutomationConfig interface
- Improve position size validation and safety margins

These changes enable proper leveraged perpetual futures trading with correct
position sizing, collateral usage, and automated TP/SL order placement.

app/api/automation/trade/route.js

@@ -11,6 +11,10 @@ export async function POST(request) {
       amount, 
       side, 
       leverage = 1,
+      stopLoss,
+      takeProfit,
+      stopLossPercent,
+      takeProfitPercent,
       mode = 'SIMULATION'
     } = await request.json()
 
@@ -29,6 +33,10 @@ export async function POST(request) {
       amount,
       side,
       leverage,
+      stopLoss,
+      takeProfit,
+      stopLossPercent,
+      takeProfitPercent,
       mode
     })
 
@@ -65,15 +73,16 @@ export async function POST(request) {
           'Content-Type': 'application/json'
         },
         body: JSON.stringify({
-          action: 'place_order', // This was missing! Was defaulting to 'get_balance'
+          action: 'place_order',
           symbol: symbol.replace('USD', ''), // Convert SOLUSD to SOL
           amount,
           side,
           leverage,
-          // Add stop loss and take profit parameters
-          stopLoss: true,
-          takeProfit: true,
-          riskPercent: 2 // 2% risk per trade
+          // Pass through stop loss and take profit parameters
+          stopLoss: stopLoss !== undefined ? stopLoss : true,
+          takeProfit: takeProfit !== undefined ? takeProfit : true,
+          riskPercent: stopLossPercent || 2, // Use actual stop loss percentage from config
+          takeProfitPercent: takeProfitPercent || 4 // Use actual take profit percentage from config
         })
       })