feat(react): basic integration for basic widget & modal

apps/client/src/widgets/react/ReactBasicWidget.ts

@@ -0,0 +1,14 @@
+import { JSX, render } from "preact";
+import BasicWidget from "../basic_widget.js";
+
+export default abstract class ReactBasicWidget extends BasicWidget {
+
+    abstract get component(): JSX.Element;
+
+    doRender() {
+        const renderContainer = new DocumentFragment();
+        render(this.component, renderContainer);
+        this.$widget = $(renderContainer.firstChild as HTMLElement);
+    }
+
+}