Function getRefreshTokenState

Gets or initializes the refresh token from memory or storage

Retrieves the current refresh token using a memory-first strategy:

1. Returns the in-memory token if available for maximum performance
2. Falls back to loading from persistent storage if not in memory

The refresh token is critical for obtaining new access tokens when the current one expires, maintaining continuous authentication.

// Check if we have a refresh token before attempting token refresh
const refreshToken = getRefreshTokenState();
if (refreshToken) {
  // We can refresh the access token when needed
  scheduleTokenRefresh(3600);
}
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export function getRefreshTokenState(): string | null {
  if (currentRefreshToken) {
    return currentRefreshToken;
  }

  // Try to load from persistent storage
  return retrieveTokenValue<string>(REFRESH_TOKEN_KEY);
}
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