Tiptap's suggestion items() callback fired a fetch on every keystroke
after `@`, in parallel with the debounced search-input fetch. Its result
was discarded by updateState, so it was pure waste — doubling the load
on /api/persons and confusing the debounce.
Returning [] from items() routes the entire fetch flow through the
search-input -> debounced onSearch path. New test pins @Walter to
exactly one fetch.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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