fix(web): hide Play next / Add to queue on PlayerBar's track menu

Those actions don't have meaningful semantics for the track you're
already listening to. New TrackMenu prop hideQueueActions gates the
pair; PlayerBar passes it true. Other mount sites (track rows in
lists) keep the full 8-entry menu.

web/src/lib/components/PlayerBar.svelte

@@ -71,7 +71,7 @@
         </a>
       </div>
       <LikeButton entityType="track" entityId={current.id} />
-      <TrackMenu track={current} direction="up" />
+      <TrackMenu track={current} direction="up" hideQueueActions />
     </div>
 
     <!-- Center: seek row + transport row -->

web/src/lib/components/TrackMenu.svelte

@@ -29,12 +29,17 @@
 
   let {
     track,
-    direction = 'down'
+    direction = 'down',
+    hideQueueActions = false
   }: {
     track: TrackRef;
     /** Whether the dropdown opens above the trigger ('up') or below ('down').
         Pass 'up' when used near the bottom of the viewport (e.g. PlayerBar). */
     direction?: 'up' | 'down';
+    /** Hide "Play next" / "Add to queue". Set true on the PlayerBar where
+        the menu's track IS the currently-playing one — those actions have
+        no meaningful semantics for the track you're already listening to. */
+    hideQueueActions?: boolean;
   } = $props();
 
   let menuOpen = $state(false);
@@ -154,10 +159,12 @@
              {direction === 'up' ? 'bottom-full mb-1' : 'top-full mt-1'}"
       onclick={(e) => e.stopPropagation()}
     >
-      <TrackMenuItem icon={ListPlus} label="Play next" onclick={onPlayNext} />
-      <TrackMenuItem icon={Plus} label="Add to queue" onclick={onAddToQueue} />
+      {#if !hideQueueActions}
+        <TrackMenuItem icon={ListPlus} label="Play next" onclick={onPlayNext} />
+        <TrackMenuItem icon={Plus} label="Add to queue" onclick={onAddToQueue} />
 
-      <TrackMenuDivider />
+        <TrackMenuDivider />
+      {/if}
 
       <TrackMenuItem
         icon={liked ? HeartOff : Heart}