feat(web): make TrackRow click-to-play; pass tracks+index from album page

TrackRow becomes a <button> that dispatches playQueue(tracks, index).
Album page supplies the full track list + each index so the rest of
the album enqueues automatically when the user clicks a track.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/src/lib/components/TrackRow.svelte

@@ -1,14 +1,25 @@
 <script lang="ts">
   import type { TrackRef } from '$lib/api/types';
   import { formatDuration } from '$lib/media/duration';
+  import { playQueue } from '$lib/player/store.svelte';
 
-  let { track }: { track: TrackRef } = $props();
+  let { tracks, index }: { tracks: TrackRef[]; index: number } = $props();
+
+  const track = $derived(tracks[index]);
+
+  function onClick() {
+    playQueue(tracks, index);
+  }
 </script>
 
-<div class="grid grid-cols-[32px_1fr_auto] items-center gap-4 px-3 py-2 text-sm odd:bg-surface/50">
+<button
+  type="button"
+  onclick={onClick}
+  class="grid w-full grid-cols-[32px_1fr_auto] items-center gap-4 px-3 py-2 text-left text-sm odd:bg-surface/50 hover:bg-surface focus-visible:outline focus-visible:outline-2 focus-visible:outline-accent"
+>
   <span class="text-right tabular-nums text-text-secondary">
     {track.track_number ?? '—'}
   </span>
   <span class="truncate">{track.title}</span>
   <span class="tabular-nums text-text-secondary">{formatDuration(track.duration_sec)}</span>
-</div>
+</button>