Function clearTokenState

Clears all in-memory token state

Completely resets the authentication state in memory by:

1. Clearing the access token, refresh token, and expiry timestamp
2. Canceling any pending token refresh operations

This function is typically called during logout or when authentication needs to be completely reset.

// Reset all authentication state during logout
clearTokenState();
displayLoginScreen();
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export function clearTokenState(): void {
  currentAccessToken = null;
  currentRefreshToken = null;
  tokenExpiryTimestamp = null;
  clearRefreshTimer();
}
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