What are the most common sources of memory leaks in JavaScript and React applications, how do you detect them with Chrome DevTools, and how do WeakRef and FinalizationRegistry help?

Imagine you have a toy box, but every time you take a toy out, you forget to close the lid. Eventually, the box overflows and you can't find anything. Memory leaks are like that—your app keeps holding onto things it doesn't need, slowing everything down until it crashes.