Render QR code on finished series page; v2.0.34

The downloadQrUrl field was saved but never displayed — add the QR image
below the action buttons, wrapped in a link to the download URL.

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

src/App.tsx

@@ -1699,6 +1699,14 @@ function FinishedSeriesPage({ content }: { content: SiteContent }) {
                 </a>
               )}
             </div>
+            {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" />
+                </a>
+                <p className="finished-series-qr-label">Scan to download</p>
+              </div>
+            )}
           </div>
         </div>
         <h2 id="playlist" className="finished-series-playlist-heading">Episode Playlist</h2>