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// Fix: debounced search with AbortController
const controller = new AbortController();
let t;

function search(q) {
  clearTimeout(t);
  t = setTimeout(async () => {
    controller.abort();
    const res = await fetch(`/api?q=${q}`, { 
      signal: controller.signal 
    });
    render(await res.json());
  }, 250);
}

Tip: cancel in-flight requests to avoid race conditions when users type quickly.