Clear all filters control resets to unfiltered state in one action

Users accumulate filters exploratively — they click a category, a price range, a rating threshold, then realize they want to start over. Without a clear-all control, they must find and click the remove button on each chip one at a time, or figure out that clicking the filter again toggles it off. Both paths take 4-8 seconds of friction at the moment the user most wants to restart their exploration. A single Clear all button resolves this to one click and signals that the interface respects the user's time.

Add a Clear all button inside the filter panel header that calls a handler resetting every filter key to null or default. Hide the button when no filters are active so it doesn't add noise. Edit components/FilterPanel.tsx:

{Object.values(filters).some(Boolean) && (
  <button onClick={() => onChange({ category: null, price: null, rating: null })}>
    Clear all
  </button>
)}