A "Find Stores Near Me" button looks simple: get the user's location, compare it with your stores, and show the closest results. But once you start building it, a few questions appear. How do you request location safely? How do you calculate which store is actually closest? What happens when permission is denied? And does the same approach still work with thousands of locations? Let's build the basic version in JavaScript and then look at what needs to change for production. Ho...