refactoring courseschedule storage

src/views/lib/react/index.tsx

@@ -0,0 +1,10 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+
+export default function render(element: React.ReactElement, container: HTMLElement | ShadowRoot | null) {
+    if (!container) {
+        throw new Error('Container is null');
+    }
+    const root = ReactDOM.createRoot(container);
+    root.render(element);
+}