fix(playback): stop transport fade-out that - handleStop goi stopAllPlayback(true) (bo sot v14) + FADE_MS 80->200ms de fade nghe ro, het cat dung; sync 5 ban JS + index.html ?v=202608181827

app/static/js/app.jsx

@@ -23347,7 +23347,7 @@ const App = () => {
     // Lưu ref trước khi clear để doHardStop trễ không đụng playback mới.
     const ctx = getAudioContext();
     const stopEpoch = _nativePlayEpoch;
-    const FADE_MS = 80;
+    const FADE_MS = 200;
     const capturedSources = activeSourcesRef.current.slice();
     const capturedNodes = Object.values(activeTrackNodesRef.current);
     activeSourcesRef.current = [];
@@ -23489,7 +23489,7 @@ const App = () => {
       stopRecordingTake();
       return;
     }
-    stopAllPlayback();
+    stopAllPlayback(true); // user stop transport — fade out
     if (activeTab !== 'main' && !activeTab.startsWith('session_')) {
       setSubTabs(prev => prev.map(s => s.id === activeTab ? {
         ...s,

app/templates/index.html

@@ -50,7 +50,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608181818" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608181827" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {