fix: track VU meter stays idle when track not audible (solo/mute)

app/static/js/app.jsx

@@ -18452,8 +18452,14 @@ const App = () => {
         const canvas = trackVuRefs.current[key];
         if (!canvas) return;
 
+        // Only animate when real audio actually passes through the track (solo/mute aware)
+        var vuTracks = activeTracksRef.current || [];
+        var anySoloVU = vuTracks.some(function(t) { return t.solo; });
+        var vuTrack = vuTracks.find(function(t) { return t.id === trackId; });
+        var isAudible = vuTrack ? (anySoloVU ? !!vuTrack.solo : !vuTrack.muted) : true;
+
         let audioPeak = 0;
-        if (node && node.analyserNode) {
+        if (isAudible && node && node.analyserNode) {
           const analyser = node.analyserNode;
           const data = new Uint8Array(128);
           analyser.getByteTimeDomainData(data);
@@ -18463,7 +18469,7 @@ const App = () => {
           }
         }
 
-        let midiPeak = isPlaying ? (midiVuActivityRef.current[trackId] || 0) : 0;
+        let midiPeak = isPlaying && isAudible ? (midiVuActivityRef.current[trackId] || 0) : 0;
         if (midiPeak > 0) {
           midiVuActivityRef.current[trackId] = midiPeak * 0.90;
           if (midiVuActivityRef.current[trackId] < 0.01) {