V45.27: fix (1) PR tab preview cam khi sub-tab PR khong ARM - ARM MAIN/SECTION cuc bo, khong leak sang PR (3 nhanh: vkbNoteOn prArmedIds + attachMidiHandler bridge bPrArmed + SonicSF arSubs them && isArmed); (2) crackle preview VST2 instrument loop/tremolo - ring worklet bridgeAudioWorklet 16->32 block (~170ms) hap thu stall render loop C++ khi instrument xu li loop/tremolo nang CPU (8->16 truoc da dung tremolo, 16 chua du); them stats overrun/underrun tu worklet -> getDiag/preview_diag (ws=ov/un) de xac minh con crackle khong. v=202608311809

app/static/js/services/bridgeAudioNode.js

@@ -16,6 +16,7 @@
   var _ctx = null;
   var _initialized = false;
   var _useWorklet = false;
+  var _workletStats = null; // stats tu worklet (overrun/underrun) — getDiag
   var _dest = null; // destination gain node da noi (chong connect trung)
 
   function _getCtx() {
@@ -31,7 +32,7 @@
       console.warn('[BridgeAudioNode] AudioWorklet unavailable — ScriptProcessor fallback');
       return false;
     }
-    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608291200';
+    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608311809';
     _ctx.audioWorklet.addModule(url).then(function () {
       if (!_initialized) return; // disconnect() happened while loading
       if (_useWorklet) return;   // already set up (init retry)
@@ -42,6 +43,9 @@
           outputChannelCount: [2]
         });
         _workletNode.connect(_gainNode);
+        _workletNode.port.onmessage = function (ev) {
+          if (ev.data && ev.data.type === 'stats') _workletStats = ev.data;
+        };
         _useWorklet = true;
         // drain pre-buffer into worklet (order preserved)
         while (_preBuffer.length) {
@@ -168,7 +172,8 @@
         hasWorkletNode: !!_workletNode,
         preBufferLen: _preBuffer.length,
         chunksLen: _chunks.length,
-        gain: _gainNode ? _gainNode.gain.value : -1
+        gain: _gainNode ? _gainNode.gain.value : -1,
+        ws: _workletStats
       };
     }
   };