Toasts notifications in Thymeleaf with Shoelace and htmx - part 2

Part 2 of a series on implementing toast notifications in a Spring Boot web application using Thymeleaf, Shoelace, and htmx. The post demonstrates a Spring MVC controller that handles htmx POST requests, returning different Thymeleaf fragment responses (success, near-shipping, or error toasts) based on a simulated random purchase outcome, with message internationalization support via MessageSource.