V42+V42A: fix seam click khi loop master FX — worklet wrap crossfade (tail->head) + native WebAudio loop cho bypass (het click beat 0); dip bypass 5ms; PDC playhead freeze/snap

app/static/js/services/bridgeAudioNode.js

@@ -31,7 +31,7 @@
       console.warn('[BridgeAudioNode] AudioWorklet unavailable — ScriptProcessor fallback');
       return false;
     }
-    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608152200';
+    var url = '/static/js/services/bridgeAudioWorklet.js?v=202608272301';
     _ctx.audioWorklet.addModule(url).then(function () {
       if (!_initialized) return; // disconnect() happened while loading
       if (_useWorklet) return;   // already set up (init retry)
@@ -49,12 +49,15 @@
           _workletNode.port.postMessage({ type: 'audio', l: b.l, r: b.r });
         }
         console.log('[BridgeAudioNode] AudioWorklet active');
+        try { if (window.__dbgLog) window.__dbgLog('worklet', 'active pre=' + _preBuffer.length); } catch (e) {}
       } catch (err) {
         console.warn('[BridgeAudioNode] AudioWorkletNode failed — ScriptProcessor fallback', err);
         _useWorklet = false;
+        try { if (window.__dbgLog) window.__dbgLog('worklet', 'NODE_FAIL'); } catch (e) {}
       }
     }).catch(function (err) {
       console.warn('[BridgeAudioNode] addModule failed — ScriptProcessor fallback', err);
+      try { if (window.__dbgLog) window.__dbgLog('worklet', 'MODULE_FAIL'); } catch (e) {}
     });
     return true; // pending — worklet may become active later
   }
@@ -157,6 +160,16 @@
       _dest = dest;
     },
     disconnect: disconnect,
-    isReady: function () { return _initialized; }
+    isReady: function () { return _initialized; },
+    getDiag: function () {
+      return {
+        initialized: _initialized,
+        useWorklet: _useWorklet,
+        hasWorkletNode: !!_workletNode,
+        preBufferLen: _preBuffer.length,
+        chunksLen: _chunks.length,
+        gain: _gainNode ? _gainNode.gain.value : -1
+      };
+    }
   };
 })();