The desktop header search only navigated on submit — the autocomplete
suggestions dropdown existed on mobile (explore SearchSection) but was
never wired into the desktop chrome. Reuse the same useSearchAutocomplete
hook (debounced) and render a suggestions dropdown under the search box:
product titles navigate to /search, sellers navigate to /seller/<id>.
Closes on outside-click / Escape / selection.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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