Extract useGoogleAuth from app.tsx

src/hooks/use_google_auth.ts

@@ -0,0 +1,19 @@
+import {useState} from 'react';
+import {googleDriveService} from '../datasource/google_drive_service';
+
+/**
+ * Custom React hook to manage and track the state of Google Drive OAuth2 credentials.
+ */
+export function useGoogleAuth() {
+  /** Tracks whether the user has a valid cached Google Drive OAuth access token. */
+  const [hasGoogleToken, setHasGoogleToken] = useState(
+    () => !!googleDriveService.getAccessToken(),
+  );
+
+  return {
+    /** Tracks whether the user has a valid cached Google Drive OAuth access token. */
+    hasGoogleToken,
+    /** Function to update the token presence state in React. */
+    setHasGoogleToken,
+  };
+}