Finished book QR label: say it downloads the full album; v2.10.4

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

src/App.tsx

@@ -1967,9 +1967,9 @@ function FinishedSeriesPage({ content }: { content: SiteContent }) {
             {book.downloadQrUrl && book.downloadUrl && (
               <div className="finished-series-qr">
                 <a href={book.downloadUrl} target="_blank" rel="noopener noreferrer">
-                  <img src={book.downloadQrUrl} alt="Scan to download" className="finished-series-qr-img" />
+                  <img src={book.downloadQrUrl} alt={`QR code to download the ${book.title} album`} className="finished-series-qr-img" />
                 </a>
-                <p className="finished-series-qr-label">Scan to download</p>
+                <p className="finished-series-qr-label">Scan to download the full album</p>
               </div>
             )}
           </div>