Convert App to TypeScript

(cherry picked from commit d6d90a64a39d3b9d3a95fb6b265517693a70fdd7)

Closes #10233

frontend/src/App/App.tsx

@@ -0,0 +1,30 @@
+import { ConnectedRouter, ConnectedRouterProps } from 'connected-react-router';
+import React from 'react';
+import DocumentTitle from 'react-document-title';
+import { Provider } from 'react-redux';
+import { Store } from 'redux';
+import PageConnector from 'Components/Page/PageConnector';
+import ApplyTheme from './ApplyTheme';
+import AppRoutes from './AppRoutes';
+
+interface AppProps {
+  store: Store;
+  history: ConnectedRouterProps['history'];
+}
+
+function App({ store, history }: AppProps) {
+  return (
+    <DocumentTitle title={window.Radarr.instanceName}>
+      <Provider store={store}>
+        <ConnectedRouter history={history}>
+          <ApplyTheme />
+          <PageConnector>
+            <AppRoutes />
+          </PageConnector>
+        </ConnectedRouter>
+      </Provider>
+    </DocumentTitle>
+  );
+}
+
+export default App;