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

app/static/js/services/soundfontPlayer.js

@@ -86,14 +86,15 @@
 
                     console.log("[SonicSF] AudioCtx state:", _audioCtx.state, "sampleRate:", _audioCtx.sampleRate);
 
-                    // ScriptProcessor is the proven-stable renderer in this app.
-                    // The AudioWorklet path (fluidsynth-bridge) is implemented and
-                    // mono-safe, but it caused device-specific audio failures, so
-                    // keep it opt-in (flip to false to try it) — the deprecation
-                    // console warning is cosmetic.
-                    var _useScriptNode = true;
+                    // Use the AudioWorklet (fluidsynth-bridge) — ScriptProcessor
+                    // is deprecated and logs a console warning. The worklet is
+                    // now mono-safe (handles 1/2/N channel outputs) and the node
+                    // is forced stereo, and the URL is cache-busted so the fixed
+                    // module always loads. Falls back to ScriptProcessor if the
+                    // worklet cannot be created (older browsers).
+                    var _useScriptNode = false;
                     try {
-                        await _audioCtx.audioWorklet.addModule('/static/js/worklets/fluidsynth-bridge.js?v=202608031240');
+                        await _audioCtx.audioWorklet.addModule('/static/js/worklets/fluidsynth-bridge.js?v=202608031315');
                         console.log("[SonicSF] Worklet registered OK");
                     } catch (e) {
                         console.warn("[SonicSF] Worklet reg failed:", e);