feat: add video playback support in lightbox and photo grid

- Lightbox renders <video> with controls for video assets
- PhotoGrid shows video indicator overlay on video thumbnails
- Skip video preloading in lightbox (streams on demand)
- Add video-related CSS styles
- Update catch-all page to pass video URLs to components

app/globals.css

@@ -846,10 +846,19 @@
   letter-spacing: 0.02em;
 }
 
+.album-header__description {
+  margin-top: 12px;
+  font-size: 1rem;
+  color: var(--text-secondary);
+  font-weight: 300;
+  line-height: 1.6;
+  max-width: 640px;
+}
+
 .album-header__meta {
   margin-top: 8px;
   font-size: 0.9rem;
-  color: var(--text-secondary);
+  color: var(--text-muted);
   font-weight: 300;
 }
 
@@ -1005,6 +1014,27 @@
   opacity: 1;
 }
 
+.photo-grid__item-play {
+  position: absolute;
+  inset: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  pointer-events: none;
+}
+
+.photo-grid__item-play svg {
+  width: 48px;
+  height: 48px;
+  color: white;
+  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.5));
+  transition: transform var(--transition-fast);
+}
+
+.photo-grid__item:hover .photo-grid__item-play svg {
+  transform: scale(1.1);
+}
+
 /* ── Loading States ───────────────────────────────── */
 .skeleton {
   background: linear-gradient(