Fix the request settling in a React search hook

An AI agent wrote a React hook that debounces a search box and fetches results. A reviewer asks what happens when a slow early response arrives after a newer one, or after the component unmounts. You model the hook as a list of events and decide which responses it renders.

An assistant wrote apply_search_results(events). It is in the editor. It has a bug. Find it and fix it.

Input and output:

• events: the events in arrival order. Each is "request|<seq>", "response|<seq>|<payload>" or "unmount".
• Return the payloads the hook renders, in order.

Rules the tests check:

• Split each event on |. Ignore an event that is not exactly one of the three shapes: unmount alone, request with 1 more part, or response with 2 more parts.
• <seq> must be one or more digits from 0 to 9, or the event is ignored. Sequence numbers compare as numbers, so 007 equals 7.
• The hook tracks one in-flight number, which starts at 0. A request sets it to its sequence number, whatever the number is.
• After unmount, nothing renders again.
• While mounted, a response renders when its sequence number equals the in-flight number. Rendering settles the request: the in-flight number goes back to 0.
• Any other response is ignored.