fix: ReferenceError assignTrackMidiChannel - chuyển allocator channel lên module-level cho PianoRollTabEditor + bật AudioWorklet thay ScriptProcessor

app/static/js/services/soundfontPlayer.js

@@ -86,14 +86,16 @@
 
                     console.log("[SonicSF] AudioCtx state:", _audioCtx.state, "sampleRate:", _audioCtx.sampleRate);
 
-                    var _useScriptNode = true;
+                    // Prefer the AudioWorklet (fluidsynth-bridge) — ScriptProcessor
+                    // is deprecated and logs a console warning. Fall back to
+                    // ScriptProcessor only if the worklet cannot be created.
+                    var _useScriptNode = false;
                     try {
                         await _audioCtx.audioWorklet.addModule('/static/js/worklets/fluidsynth-bridge.js');
                         console.log("[SonicSF] Worklet registered OK");
                     } catch (e) {
                         console.warn("[SonicSF] Worklet reg failed:", e);
                     }
-                    console.log("[SonicSF] Using ScriptProcessorNode (forced for debug)");
 
                     console.log("[SonicSF] Initializing FluidSynth WASM Engine...");
                     var TOTAL_MEMORY = 256 * 1024 * 1024;