The list is not updating when clicking on "Save" button.

I have looked into this issue and found that the AJAX `success` callback for the "Save Note" button was not dynamically updating the DOM tree once the note data was saved to the backend. It only console-logged the response, requiring a manual toggle or refresh to show up.

I have attached a patch that addresses this:
- Updates the save button's AJAX success handler to instantly `prepend` the new note to the `.sticky-history-box ul` list component.
- Empties the textarea and resets the border styles upon a successful save.
- Adds basic client-side validation to prevent empty submissions.
- Refactored the code to conform strictly to Drupal JavaScript coding standards (using ES6 template literals instead of old string concatenation, and avoiding native `alert()` boxes).
Please review.

@dkmishra changes merged and released thanks for your contributions.