fix: bật AudioWorklet hết deprecation ScriptProcessor + signature guard applyMasteringSettings hết BiquadFilterNode state is bad

app/static/js/app.jsx

@@ -76,6 +76,14 @@ function makeDistortionCurve(k) {
 
 function applyMasteringSettings(s) {
   if (!masterBus || !audioCtx || !s) return;
+  // getAudioContext() invokes this on EVERY call (stopAll, play, VU, …).
+  // Re-applying identical values in rapid bursts is "fast parameter automation"
+  // and makes Chromium flag the biquad EQ filters as unstable ("state is bad").
+  // Only touch the graph when a value actually changed.
+  const sig = [s.eqActive, s.eqLowGain, s.eqMid1Gain, s.eqMid2Gain, s.eqHighGain, s.imagerActive, s.w1, s.w2, s.w3, s.w4, s.maximizerActive, s.maxGain, s.maxSoftClip, s.maxUpward, s.ceiling].join('|');
+  if (sig === _lastMasteringSig) return;
+  _lastMasteringSig = sig;
+
   const now = audioCtx.currentTime;
   // Clamp every parameter so a stale/incomplete settings object can never push
   // NaN or an extreme value into the biquad filters — that puts the master
@@ -329,6 +337,7 @@ function setMasterVolume(linear) {
 }
 
 let _lastMasteringActive = null;
+let _lastMasteringSig = null;
 function toggleMasteringOnMaster(activate, isBypassed) {
   if (!masterBus) return;