Make the now-playing bar's title/artist clickable and add a cover art lightbox

The song title links to its album, the artist name links to the artist
page, and clicking the cover art opens a larger version in a modal.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014r98AtcBbevpscWLsfwVvv

web/static/css/app.css

@@ -226,19 +226,33 @@ body {
 }
 
 .vs-player-title {
+  display: block;
   font-size: 0.85rem;
   font-weight: 600;
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
+  color: inherit;
+  text-decoration: none;
 }
 
 .vs-player-artist {
+  display: block;
   font-size: 0.78rem;
   color: var(--bs-secondary-color);
   white-space: nowrap;
   overflow: hidden;
   text-overflow: ellipsis;
+  text-decoration: none;
+}
+
+.vs-player-title:hover,
+.vs-player-artist:hover {
+  text-decoration: underline;
+}
+
+.vs-player-art[role="button"] {
+  cursor: pointer;
 }
 
 .vs-player-controls {