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.

lib/automation-service.ts

@@ -16,7 +16,6 @@ export interface AutomationConfig {
   stopLossPercent: number
   takeProfitPercent: number
   maxDailyTrades: number
-  riskPercentage: number
   dexProvider: 'JUPITER' | 'DRIFT'
 }
 
@@ -571,7 +570,7 @@ export class AutomationService {
         console.log('⚠️ Failed to fetch balance, using fallback calculation')
         // Fallback to config amount
         let amount = Math.min(config.tradingAmount, 35) // Cap at $35 max
-        const riskAdjustment = config.riskPercentage / 100
+        const riskAdjustment = 0.02 // Default 2% risk
         return Math.max(amount * riskAdjustment, 5)
       }
 
@@ -585,7 +584,7 @@ export class AutomationService {
       }
 
       // Calculate position size based on risk percentage of available balance
-      const riskAmount = availableBalance * (config.riskPercentage / 100)
+      const riskAmount = availableBalance * 0.02 // Default 2% risk
       
       // Adjust based on confidence (reduce risk for low confidence signals)
       const confidenceMultiplier = Math.min(analysis.confidence / 100, 1)
@@ -600,8 +599,7 @@ export class AutomationService {
 
       console.log(`📊 Position sizing calculation:`)
       console.log(`  - Available balance: $${availableBalance}`)
-      console.log(`  - Risk percentage: ${config.riskPercentage}%`)
-      console.log(`  - Risk amount: $${riskAmount.toFixed(2)}`)
+      console.log(`  - Risk amount: $${riskAmount.toFixed(2)} (2% default)`)
       console.log(`  - Confidence multiplier: ${confidenceMultiplier}`)
       console.log(`  - Leverage: ${Math.min(config.maxLeverage, 10)}x`)
       console.log(`  - Final position size: $${amount.toFixed(2)}`)