Regrade

• Error Handling Enhancement: Modified the script to address an issue with options.data.indexOf causing a TypeError when options.data was not a string, by adding type checks and conversions for object and FormData instances.
• Enhanced AJAX Data Handling: Improved the handling of options.data to gracefully handle various data types (string, object, FormData) without breaking other scripts or forms, especially when submitting a contact form.
• Selective Spinner Display for AJAX Requests:
  • Added explicit checks to display the spinner for FormData instances, typically associated with form submissions.
  • Ensured that AJAX requests with non-standard data types fail gracefully, avoiding script errors and allowing other scripts to run smoothly.
• Heartbeat API Ignoring Logic: Refined the logic for ignoring WordPress heartbeat API calls to prevent unnecessary display of the loader overlay during such background requests.