Add app state change listener to manage focus state with React Query

src/CapacitorListener.js

@@ -5,6 +5,7 @@ import { Device } from '@capacitor/device'
 import { LocalNotifications } from '@capacitor/local-notifications'
 import { Preferences } from '@capacitor/preferences'
 import { PushNotifications } from '@capacitor/push-notifications'
+import { focusManager } from '@tanstack/react-query'
 import { RegisterDeviceToken } from './utils/Fetcher'
 
 // OAuth callback handler for deep links
@@ -225,6 +226,10 @@ const registerCapacitorListeners = () => {
     }
   })
   
+  mobileApp.addListener('appStateChange', ({ isActive }) => {
+    focusManager.setFocused(isActive)
+  })
+
   mobileApp.addListener('backButton', ({ canGoBack }) => {
     if (canGoBack) {
       window.history.back()