Function getTokenExpiryState

Gets or initializes the token expiry timestamp from memory or storage

Retrieves the timestamp when the current access token expires using a memory-first strategy:

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

The expiry timestamp is used to determine when to refresh tokens and if the current token is still valid for API requests.

// Check if token needs immediate refresh
const expiry = getTokenExpiryState();
if (expiry && expiry - Date.now() < 60000) {
  // Token expires in less than a minute, refresh now
  refreshAccessToken();
}
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export function getTokenExpiryState(): number | null {
  if (tokenExpiryTimestamp) {
    return tokenExpiryTimestamp;
  }

  // Try to load from persistent storage
  return retrieveTokenValue<number>(TOKEN_EXPIRY_KEY);
}
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