feat: Implement Jupiter-style trading interface with token selection

- Add 'You're paying' and 'You're receiving' sections with proper token dropdowns
- Implement balance display and MAX button functionality
- Add automatic receiving amount calculation based on paying amount
- Enhance token selector with icons, names, and balance information
- Improve leverage position value calculations and risk warnings
- Update trade execution to use new paying/receiving token structure
- Maintain all existing functionality including stop loss, take profit, and position management

This creates a more intuitive and professional trading interface that matches Jupiter's UX patterns.

next.config.ts

@@ -1,14 +1,7 @@
 import type { NextConfig } from "next";
 
 const nextConfig: NextConfig = {
-  transpilePackages: ['lightweight-charts'],
-  webpack: (config) => {
-    config.resolve.fallback = {
-      ...config.resolve.fallback,
-      fs: false,
-    };
-    return config;
-  },
+  // Simple configuration for stability
 };
 
 export default nextConfig;