fix: strip .js extensions from SDK imports; restore turbopack dev

app/next.config.ts

@@ -3,15 +3,6 @@ import type { NextConfig } from 'next'
 const config: NextConfig = {
   reactStrictMode: true,
   transpilePackages: ['@solana/connector', '@solisting/sdk', '@descro/sdk'],
-  webpack(webpackConfig) {
-    // Workspace SDK packages use .js extensions on TypeScript imports (ESM convention)
-    // but have no compiled output — webpack must resolve .js → .ts
-    webpackConfig.resolve.extensionAlias = {
-      '.js': ['.ts', '.tsx', '.js'],
-      '.mjs': ['.mts', '.mjs'],
-    }
-    return webpackConfig
-  },
 }
 
 export default config

app/package.json

@@ -2,7 +2,7 @@
   "name": "solisting-app",
   "private": true,
   "scripts": {
-    "dev": "next dev",
+    "dev": "next dev --turbopack",
     "build": "next build",
     "start": "next start",
     "typecheck": "tsc --noEmit"