feat(vscode-ide-companion): import chat chat customEditor to vscode extension folder

packages/vscode-ide-companion/src/webview/index.tsx

@@ -0,0 +1,15 @@
+/**
+ * @license
+ * Copyright 2025 Qwen Team
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import ReactDOM from 'react-dom/client';
+import { App } from './App.js';
+import './App.css';
+
+const container = document.getElementById('root');
+if (container) {
+  const root = ReactDOM.createRoot(container);
+  root.render(<App />);
+}