Add download option and CD disc artwork to finished books; v2.0.31

- Add downloadUrl field to FinishedBook type
- Admin: paste any external URL (Drive, Dropbox, etc.) per finished book
- Public series page: replace square hero image with circular CD disc artwork
  (conic-gradient sheen, center hole, drop shadow, slight tilt)
- Stream Episodes + Download Album action buttons in the hero
- Grid cards show a gold download badge when a download URL is set

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

src/App.css

@@ -9801,6 +9801,141 @@
   flex-shrink: 0;
 }
 
+/* ── CD disc artwork ── */
+.finished-series-cd {
+  flex-shrink: 0;
+  width: 180px;
+  height: 180px;
+  position: relative;
+}
+
+.finished-series-cd-disc {
+  width: 180px;
+  height: 180px;
+  border-radius: 50%;
+  overflow: hidden;
+  position: relative;
+  box-shadow:
+    0 12px 40px rgba(0, 0, 0, 0.7),
+    0 2px 8px rgba(0, 0, 0, 0.5),
+    inset 0 0 0 3px rgba(201, 168, 76, 0.12);
+}
+
+.finished-series-cd-img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+  display: block;
+}
+
+.finished-series-cd-sheen {
+  position: absolute;
+  inset: 0;
+  border-radius: 50%;
+  background: conic-gradient(
+    from 20deg,
+    transparent 0%,
+    rgba(255, 255, 255, 0.06) 8%,
+    transparent 16%,
+    rgba(255, 255, 255, 0.09) 28%,
+    transparent 38%,
+    rgba(255, 255, 255, 0.04) 52%,
+    transparent 60%,
+    rgba(255, 255, 255, 0.07) 74%,
+    transparent 84%,
+    rgba(255, 255, 255, 0.05) 94%,
+    transparent 100%
+  );
+  pointer-events: none;
+  z-index: 1;
+}
+
+.finished-series-cd-hole {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  width: 30px;
+  height: 30px;
+  border-radius: 50%;
+  background: radial-gradient(circle, #0e0e09 60%, rgba(201, 168, 76, 0.15) 100%);
+  border: 1.5px solid rgba(201, 168, 76, 0.25);
+  box-shadow: inset 0 0 6px rgba(0, 0, 0, 0.9);
+  z-index: 2;
+}
+
+/* ── Series action buttons ── */
+.finished-series-actions {
+  display: flex;
+  gap: 0.75rem;
+  margin-top: 1.25rem;
+  flex-wrap: wrap;
+}
+
+.finished-series-btn-stream {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4em;
+  padding: 0.5rem 1.1rem;
+  border-radius: 6px;
+  font-size: 0.88rem;
+  font-weight: 600;
+  letter-spacing: 0.03em;
+  text-decoration: none;
+  border: 1px solid rgba(201, 168, 76, 0.4);
+  color: var(--brand-gold);
+  background: transparent;
+  transition: background 150ms, border-color 150ms;
+}
+
+.finished-series-btn-stream:hover {
+  background: rgba(201, 168, 76, 0.08);
+  border-color: rgba(201, 168, 76, 0.7);
+}
+
+.finished-series-btn-download {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.4em;
+  padding: 0.5rem 1.1rem;
+  border-radius: 6px;
+  font-size: 0.88rem;
+  font-weight: 600;
+  letter-spacing: 0.03em;
+  text-decoration: none;
+  background: var(--brand-gold);
+  color: #0e0e09;
+  border: 1px solid var(--brand-gold);
+  transition: opacity 150ms, transform 150ms;
+}
+
+.finished-series-btn-download:hover {
+  opacity: 0.88;
+  transform: translateY(-1px);
+}
+
+/* ── Download badge on grid cards ── */
+.finished-book-card-img-wrap {
+  position: relative;
+}
+
+.finished-book-card-dl-badge {
+  position: absolute;
+  top: 0.5rem;
+  right: 0.5rem;
+  background: var(--brand-gold);
+  color: #0e0e09;
+  font-size: 0.72rem;
+  font-weight: 700;
+  width: 1.6rem;
+  height: 1.6rem;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
+}
+
 .finished-series-title {
   font-family: var(--brand-font-heading);
   font-size: 2rem;
@@ -10006,6 +10141,16 @@
     width: 120px;
     height: 120px;
   }
+
+  .finished-series-cd {
+    width: 140px;
+    height: 140px;
+  }
+
+  .finished-series-cd-disc {
+    width: 140px;
+    height: 140px;
+  }
 }
 
 /* ── Finished Books page section ── */