Distinct circular song cards with jump-to-album badge (#953)

* feat(tracks): distinct circular song cards with jump-to-album badge

Single-track cards looked identical to album tiles, so clicking the body
read as album behaviour even though it starts playback. Give them a round
vinyl-style cover (square stays album-only) via a shared .cover-circle
utility, and add a 'To album' badge under the artist that navigates to the
track's album. Card click still plays; the badge is the explicit nav path.

* i18n(tracks): add toAlbum label across 9 locales

* docs(changelog): track-card redesign + to-album badge (#953)

src/styles/layout/cover-art.css

@@ -24,3 +24,25 @@
   color: var(--text-muted);
 }
 
+/* ─── Circular cover utility ───
+   Shared round-cover treatment so circular cover art (single-track cards today,
+   reusable elsewhere) is defined once instead of re-rolling border-radius:50% per
+   component. Carries the paint-stability hints round image clipping needs on
+   WebKitGTK/Wayland — mirrors the artist-card avatar (see artist-card-grid-view.css). */
+.cover-circle {
+  position: relative;
+  aspect-ratio: 1;
+  overflow: hidden;
+  border-radius: var(--radius-full);
+  background: var(--bg-hover);
+  contain: paint;
+  isolation: isolate;
+  transform: translateZ(0);
+}
+
+.cover-circle img {
+  width: 100%;
+  height: 100%;
+  object-fit: cover;
+}
+