fix(react): overlays shown with useIonModal and useIonPopover no longer render outside of main react tree

closes #23516 and #23516

packages/react/src/components/index.ts

@@ -142,6 +142,7 @@ export { IonModal } from './IonModal';
 export { IonPopover } from './IonPopover';
 
 // Custom Components
+export { IonApp } from './IonApp';
 export { IonPage } from './IonPage';
 export { IonTabsContext, IonTabsContextState } from './navigation/IonTabsContext';
 export { IonTabs } from './navigation/IonTabs';