feat(extension): complete VS Code extension with kanban board interface (#997)

---------
Co-authored-by: DavidMaliglowka <13022280+DavidMaliglowka@users.noreply.github.com>
Co-authored-by: Ralph Khreish <35776126+Crunchyman-ralph@users.noreply.github.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

apps/extension/src/webview/sidebar.tsx

@@ -0,0 +1,16 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import { SidebarView } from './components/SidebarView';
+
+const rootElement = document.getElementById('root');
+
+if (!rootElement) {
+	console.error('Sidebar: Root element not found');
+} else {
+	const root = ReactDOM.createRoot(rootElement);
+	root.render(
+		<React.StrictMode>
+			<SidebarView />
+		</React.StrictMode>
+	);
+}