Fix USDT swap insufficient balance bug

Root cause: Token symbol mismatch between TokenSwap component and WalletContext
- WalletContext stored balance with key 'USDT'
- TokenSwap used symbol 'wUSDT' for lookups
- This caused balances['wUSDT'] to return undefined
- Triggered false "insufficient balance" errors

Changes:
- Updated TokenSwap.tsx to use 'USDT' symbol consistently
- Fixed token symbol in AVAILABLE_TOKENS array
- Updated asset ID mapping in swap transaction logic
- Fixed swap history token display

Also includes:
- Added new DEX components (SwapInterface, PoolBrowser, etc.)
- Added TypeScript type definitions for DEX
- Added DEX utility functions
- Removed obsolete test scripts
- Updated WalletContext with USDT balance support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

vite.config.ts

@@ -6,7 +6,15 @@ import path from "path";
 export default defineConfig(({ mode }) => ({
   server: {
     host: "::",
-    port: 8080,
+    port: 8081,
+    hmr: {
+      protocol: 'ws',
+      host: 'localhost',
+      port: 8081,
+    },
+    watch: {
+      usePolling: true,
+    },
   },
   plugins: [
     react()
@@ -14,6 +22,7 @@ export default defineConfig(({ mode }) => ({
   resolve: {
     alias: {
       "@": path.resolve(__dirname, "./src"),
+      "@pezkuwi/i18n": path.resolve(__dirname, "../shared/i18n"),
     },
   },
   json: {