Deck builder: show prices in the Not owned card search

CardSearchBox gains a showPrice option that puts each result's price at
the right of its row; the deck builder's Not owned box turns it on.

Closes #21

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/views/DeckView.tsx

@@ -1583,6 +1583,7 @@ function DeckBuilder({
               onChange={setAnyQuery}
               results={anyResults}
               onPick={addToDeck}
+              showPrice
             />
             {cardsGroup(unowned)}
           </section>