music box fixes

goodbye/index.html

@@ -503,10 +503,10 @@ body {
 
   function renderMusicState(s) {
     if (!npLine) ensureNowPlayingLine();
-    if (lastTrackIndex !== null && s.index !== lastTrackIndex) {
+    if (lastTrackFile !== null && s.file && s.file !== lastTrackFile) {
       logBeforeNp(`[audio] next: ${s.title || '?'}`);
     }
-    lastTrackIndex = s.index;
+    if (s.file) lastTrackFile = s.file;
     npLine.querySelector('.np-title').textContent = s.title || '—';
     npLine.querySelector('.np-time').textContent  =
       `[${fmtClock(s.currentTime)} / ${fmtClock(s.duration)}]`;
@@ -533,7 +533,8 @@ body {
     if (pendingState) renderMusicState(pendingState);
   }
 
-  let lastTrackIndex = null;
+  // Dedupe by file URI — see music-box/index.html for the rationale.
+  let lastTrackFile = null;
   async function connectMusic() {
     if (!window.__OBSWS) {
       logBeforeNp('[audio] vendor/obs-config.js missing — run scripts/setup.sh', 'term-dim');