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Implement debounce from scratch: delay execution until a quiet period has passed, resetting the timer on every new call.
Debounce delays a function until the caller stops invoking it for at least delay ms. Each new call resets the timer. Classic use case: firing a search API only after the user pauses typing, not on every keystroke.
Goal: Implement debounce with timer reset on every call. Bonus: add leading-edge and cancel().
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