feat(web): add CompactTrackCard for Most played rows

Small 140px clickable card showing album cover, title, and artist name.
Clicking calls playQueue(sectionTracks, index) to play through the full
section list. Includes Vitest tests for click and render behaviour.

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

web/src/lib/components/CompactTrackCard.svelte

@@ -0,0 +1,44 @@
+<script lang="ts">
+  import type { TrackRef } from '$lib/api/types';
+  import { playQueue } from '$lib/player/store.svelte';
+  import { FALLBACK_COVER } from '$lib/media/covers';
+
+  let {
+    track,
+    sectionTracks,
+    index
+  }: {
+    track: TrackRef;
+    sectionTracks: TrackRef[];
+    index: number;
+  } = $props();
+
+  const coverUrl = $derived(`/api/albums/${track.album_id}/cover`);
+
+  function onImgError(e: Event) {
+    (e.currentTarget as HTMLImageElement).src = FALLBACK_COVER;
+  }
+
+  function onClick() {
+    playQueue(sectionTracks, index);
+  }
+</script>
+
+<button
+  type="button"
+  aria-label={`Play ${track.title}`}
+  onclick={onClick}
+  class="card group block w-36 rounded text-left focus-visible:ring-2 focus-visible:ring-accent"
+>
+  <div class="aspect-square w-full overflow-hidden rounded-md bg-surface-hover">
+    <img
+      src={coverUrl}
+      alt=""
+      class="h-full w-full object-cover transition-transform group-hover:scale-[1.03]"
+      loading="lazy"
+      onerror={onImgError}
+    />
+  </div>
+  <div class="mt-2 truncate text-xs font-medium text-text-primary">{track.title}</div>
+  <div class="truncate text-xs text-text-secondary">{track.artist_name}</div>
+</button>