feat(web): wire LikeButton into TrackRow, AlbumCard, ArtistRow, PlayerBar

Heart appears on every entity rendering surface. ArtistRow restructured
to a <div> with the link as a positioned overlay so the heart button
can nest without invalid <button>-in-<a> markup. Shell nav grows a
'Liked' entry pointing at /library/liked.

web/src/lib/components/AlbumCard.svelte

@@ -3,6 +3,7 @@
   import { FALLBACK_COVER } from '$lib/media/covers';
   import { api } from '$lib/api/client';
   import { enqueueTracks } from '$lib/player/store.svelte';
+  import LikeButton from './LikeButton.svelte';
 
   let { album }: { album: AlbumRef } = $props();
 
@@ -35,10 +36,13 @@
       <div class="text-xs text-text-secondary">{album.year}</div>
     {/if}
   </a>
-  <button
-    type="button"
-    aria-label="Add to queue"
-    onclick={onAddClick}
-    class="absolute right-2 top-2 rounded-full bg-surface/80 px-2 py-1 text-sm text-text-secondary hover:text-text-primary focus-visible:ring-2 focus-visible:ring-accent"
-  >+</button>
+  <div class="absolute right-2 top-2 flex gap-1">
+    <LikeButton entityType="album" entityId={album.id} />
+    <button
+      type="button"
+      aria-label="Add to queue"
+      onclick={onAddClick}
+      class="rounded-full bg-surface/80 px-2 py-1 text-sm text-text-secondary hover:text-text-primary focus-visible:ring-2 focus-visible:ring-accent"
+    >+</button>
+  </div>
 </div>