Hide per-date rescrape button for past columns

Scraping a past date via the hotel-page backend wouldn't return anything
useful (Booking.com shows no availability for dates gone by). The ↻
button is now only rendered for today and future dates.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/MarketView.tsx

@@ -1729,6 +1729,7 @@ const RateMatrixTab: React.FC = () => {
                           <span style={styles.scrapeAge}>{scrapeAge}</span>
                         ) : null}
                         <div style={{ display: 'flex', gap: 2, alignItems: 'center', justifyContent: 'center' }}>
+                          {d >= todayStr && (
                             <button
                               onClick={() => enqueueScrape(d, d)}
                               disabled={queuePos >= 0}
@@ -1744,6 +1745,7 @@ const RateMatrixTab: React.FC = () => {
                             >
                               {scrapingDate === d ? '...' : queuePos >= 0 ? `#${queuePos + 1}` : '↻'}
                             </button>
+                          )}
                           {locationName && d >= todayStr && (
                             <a
                               href={buildSearchUrl(locationName, d)}