music box fixes

music-box/index.html

@@ -465,12 +465,17 @@ body {
   }
 
   // ── State application ──
-  let lastTrackIndex = null;
+  // Dedupe by file URI, not s.index. MPD's status.song (s.index) is the
+  // queue position and shifts mid-playback when the queue is reordered
+  // (consume mode removes the prior track → later indices shift down,
+  // mpc shuffle reshuffles, etc.) — using it caused duplicate "now: …"
+  // lines for a single playthrough.
+  let lastTrackFile = null;
   function applyState(s) {
-    if (lastTrackIndex !== null && s.index !== lastTrackIndex && s.title) {
+    if (lastTrackFile !== null && s.file && s.file !== lastTrackFile && s.title) {
       logBeforePins(`[audio] now: ${s.title}`);
     }
-    lastTrackIndex = s.index;
+    if (s.file) lastTrackFile = s.file;
 
     npTitle.textContent = s.title || '—';
     npTime.textContent  = `[${fmtClock(s.currentTime)} / ${fmtClock(s.duration)}]`;