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Implement throttle from scratch: guarantee a function runs at most once per interval regardless of how often it is called.
Throttle limits how often a function fires during continuous activity. Unlike debounce, which waits for silence, throttle fires on a regular cadence. The leading-edge version fires immediately and then blocks for limit ms. The trailing version also captures the final call if one was blocked.
Goal: Implement throttle (leading edge). Bonus: add trailing-call capture with the timestamp approach.
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