diff --git a/app/static/js/app.jsx b/app/static/js/app.jsx
index ed2fb0b..02b1adc 100644
--- a/app/static/js/app.jsx
+++ b/app/static/js/app.jsx
@@ -12270,29 +12270,28 @@ const App = () => {
     var newItemId = Object.keys(newOriginals)[0] || itemId;
     var origPos = newOriginals[newItemId] || { start: 0 };
     setDraggedSectionItem({ trackId, itemType, itemId: newItemId, clickOffset, multiIds: newOriginals, originalPositions: { [newItemId]: origPos.start } });
-  } else {
-    var items = itemType === 'section' ? (track.sections || []) : (track.midiItems || []);
-    var item = items.find(function(it) { return it.id === itemId; });
-    if (!item) return;
-    var rearrangeNewId = itemType + '_dup_' + Date.now();
-    var newItem = { ...item, id: rearrangeNewId, name: item.name + ' (Copy)' };
-    updateActiveTracks(function(prev) {
-      return prev.map(function(t) {
-        if (t.id !== trackId) return t;
-        var updated = itemType === 'section' ? [...(t.sections || []), newItem] : [...(t.midiItems || []), newItem];
-        return itemType === 'section' ? { ...t, sections: updated } : { ...t, midiItems: updated };
-      });
-    });
-    setDraggedSectionItem({ trackId, itemType, itemId: rearrangeNewId, clickOffset, isDuplicate: false, originalPositions: { [rearrangeNewId]: itemType === 'section' ? item.start : item.startTime } });
-  }
-  return;
-}
-var curTrk = activeTracksRef.current ? activeTracksRef.current.find(t => t.id === trackId) : null;
-var its = itemType === 'section' ? (curTrk?.sections || []) : (curTrk?.midiItems || []);
-var it = its.find(function(x) { return x.id === itemId; });
-var origPos = it ? (itemType === 'section' ? it.start : it.startTime) : 0;
-setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, originalPositions: { [itemId]: origPos } });
-};
+      } else {
+        var items = itemType === 'section' ? (track.sections || []) : (track.midiItems || []);
+        var item = items.find(function(it) { return it.id === itemId; });
+        if (!item) return;
+        var rearrangeNewId = itemType + '_dup_' + Date.now();
+        var newItem = { ...item, id: rearrangeNewId, name: item.name + ' (Copy)' };
+        updateActiveTracks(function(prev) {
+          return prev.map(function(t) {
+            if (t.id !== trackId) return t;
+            var updated = itemType === 'section' ? [...(t.sections || []), newItem] : [...(t.midiItems || []), newItem];
+            return itemType === 'section' ? { ...t, sections: updated } : { ...t, midiItems: updated };
+          });
+        });
+        setDraggedSectionItem({ trackId, itemType, itemId: rearrangeNewId, clickOffset, isDuplicate: false, originalPositions: { [rearrangeNewId]: itemType === 'section' ? item.start : item.startTime } });
+      }
+    } else {
+      var curTrk = activeTracksRef.current ? activeTracksRef.current.find(t => t.id === trackId) : null;
+      var its = itemType === 'section' ? (curTrk?.sections || []) : (curTrk?.midiItems || []);
+      var it = its.find(function(x) { return x.id === itemId; });
+      var origPos = it ? (itemType === 'section' ? it.start : it.startTime) : 0;
+      setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, originalPositions: { [itemId]: origPos } });
+    }
   };
   handleSectionItemDragStartRef.current = handleSectionItemDragStart;
 
@@ -17099,9 +17098,9 @@ setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, origin
         className: "w-12 bg-zinc-800 border border-zinc-700 rounded text-xs text-zinc-300 text-center font-mono focus:outline-none focus:border-purple-500",
         min: "40",
         max: "300"
-      }), /*#__PURE__*/React.createElement("span",
-      className: "text-xs text-zinc-500"
-    }, "BPM")))), /*#__PURE__*/React.createElement("div", {
+      }), /*#__PURE__*/React.createElement("span", {
+        className: "text-xs text-zinc-500"
+      }, "BPM")))), /*#__PURE__*/React.createElement("div", {
       className: "flex-1 flex flex-col divide-y divide-[#141414] bg-[#262626]"
     }, activeTracks.length === 0 ? /*#__PURE__*/React.createElement("div", {
       className: "p-6 text-center text-zinc-400 flex flex-col items-center justify-center space-y-3"
@@ -18691,7 +18690,7 @@ setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, origin
       /*#__PURE__*/React.createElement("div", { className: "flex gap-4", style: { height: "420px" } },
         /*#__PURE__*/React.createElement("div", { className: "w-1/3 border-r border-[#383838] overflow-y-auto space-y-0.5 pr-2" },
           /*#__PURE__*/React.createElement("button", {
-            onClick: () => setSelectedSoundFontId(null); setSynthCategory(null); },
+            onClick: () => { setSelectedSoundFontId(null); setSynthCategory(null); },
             className: "w-full text-left px-3 py-2 text-sm rounded " + (!selectedSoundFontId ? "bg-amber-700 text-white" : "bg-zinc-800 hover:bg-zinc-700 text-zinc-300")
           }, "All Instruments"),
           (instrumentSelectorData?.soundfonts || []).map(sf => {
@@ -18744,7 +18743,7 @@ setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, origin
         )
       )
     )
-  )), fxSelectorTrackId && /*#__PURE__*/React.createElement("div", {
+  ), fxSelectorTrackId && /*#__PURE__*/React.createElement("div", {
     className: "fixed inset-0 z-50 flex items-center justify-center bg-black/60 backdrop-blur-sm",
     onClick: () => setFxSelectorTrackId(null)
   }, /*#__PURE__*/React.createElement("div", {
@@ -18754,7 +18753,7 @@ setDraggedSectionItem({ trackId, itemType, itemId, clickOffset, multiIds, origin
     /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, null), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-zinc-700 text-zinc-400" }, "None"),
     /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, 'chorus'), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-cyan-800 text-cyan-300" }, "Chorus"),
     /*#__PURE__*/React.createElement("button", { onClick: () => handleSetTrackFx(fxSelectorTrackId, 'reverb'), className: "w-full text-left px-3 py-2 text-xs rounded bg-zinc-800 hover:bg-purple-800 text-purple-300" }, "Reverb")
-  ), instrumentDropdownTrackId && instrumentDropdownBtnRect && /*#__PURE__*/React.createElement("div", {
+  ))), instrumentDropdownTrackId && instrumentDropdownBtnRect && /*#__PURE__*/React.createElement("div", {
     "data-instr-dropdown": "",
     className: "fixed z-[100] bg-[#1e1e1e] border border-zinc-700 rounded shadow-xl w-[220px] max-h-[300px] flex flex-col",
     style: {
diff --git a/app/static/js/app.precompiled.js b/app/static/js/app.precompiled.js
index 08d9758..17989f9 100644
--- a/app/static/js/app.precompiled.js
+++ b/app/static/js/app.precompiled.js
@@ -189,7 +189,7 @@ const catEntry=catalog[sfId.toLowerCase()]||catalog[sfId];if(catEntry&&catEntry.
 if(window.SonicSF&&window.SonicSF.selectInstrument&&instrumentId&&isSfInstrument){const sfId=instrumentId.replace('sf_','');var allTracks=activeTracksRef.current||tracks;var tidx=0;for(var i=0;i<allTracks.length;i++){if(allTracks[i].id===trackId){tidx=i;break;}}var ch=sfBank===128?9:tidx%16;// Store channel for consistent per-track instrument playback
 if(!allTracks[tidx]||allTracks[tidx].midiChannel===undefined){updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,midiChannel:ch}:t));}window.SonicSF.selectInstrument(ch,sfBank||0,sfProg||0,sfId);}setSubTabs(prev=>prev.map(s=>{if(s.trackId!==trackId)return s;return{...s,instrumentProgram:programNumber!==undefined?programNumber:undefined,instrumentName:displayName,instrumentId};}));const playingSub=subTabs.find(s=>s.trackId===trackId&&s.type==='PIANO_ROLL'&&s.isPlaying);if(playingSub){const pid=playingSub.id;const ctx=getAudioContext();const tNode=activeTrackNodesRef.current[trackId];if(tNode&&tNode.gainNode){tNode.gainNode.gain.setValueAtTime(tNode.gainNode.gain.value||1,ctx.currentTime);tNode.gainNode.gain.linearRampToValueAtTime(0.001,ctx.currentTime+0.04);}setTimeout(()=>{stopAllPlayback();if(tNode&&tNode.gainNode){const trackData=activeTracksRef.current?activeTracksRef.current.find(t=>t.id===trackId):null;const volDb=trackData?trackData.volumeDb??0:0;const volLinear=volDb<=-50?0:Math.pow(10,volDb/20);tNode.gainNode.gain.setValueAtTime(0.001,ctx.currentTime);tNode.gainNode.gain.linearRampToValueAtTime(volLinear||0.8,ctx.currentTime+0.015);}const context=getAudioContext();const offset=playingSub.currentTime||0;startOffsetTimeRef.current=offset;startAudioTimeRef.current=context.currentTime;startBufferOffsetRef.current=offset*(playingSub.speed||1.0);schedulePianoRollMidi(playingSub,offset);startSubTabPlayback(playingSub,offset);setSubTabs(prev=>prev.map(s=>s.id===pid?{...s,isPlaying:true}:s));if(subTabsRef.current){subTabsRef.current=subTabsRef.current.map(s=>s.id===pid?{...s,isPlaying:true}:s);}animationFrameIdRef.current=requestAnimationFrame(updatePlayhead);},60);}setTimeout(()=>lucide.createIcons(),50);};const setTrackInstrument=(trackId,instrumentId,displayName)=>{setInstrumentDropdownTrackId(null);setInstrumentDropdownBtnRect(null);if(instrumentId&&instrumentId.startsWith('sf_')){// Set instrument on track immediately so Synth button shows the name
 updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;const sfClean=instrumentId.replace('sf_','');const synthEngine={type:'soundfont',plugin_id:instrumentId,soundfont_bank:0,soundfont_program:0,soundfont_id:sfClean};return{...t,instrumentId,instrumentProgram:undefined,instrumentName:displayName,synth_engine:synthEngine};}));setSelectedSoundFontId(instrumentId);setSynthCategory('soundfont');setInstrumentSelectorTrackId(trackId);setSfPresets(null);setSfPresetSearchQuery('');const sfIdParam=instrumentId.replace('sf_','');// Use cached presets from instrumentSelectorData
-const cachedSf=(instrumentSelectorData?.soundfonts||[]).find(s=>s.id===instrumentId||s.id===sfIdParam);if(cachedSf&&cachedSf.presets){setSfPresets(cachedSf.presets);}else{window.SonicAPI.listSoundfontInstruments(sfIdParam).then(data=>setSfPresets(data.presets||[])).catch(e=>{console.error('listSoundfontInstruments failed:',e);setSfPresets([]);});}}else{setTrackInstrumentWithProgram(trackId,instrumentId,undefined,displayName);}};const[activeTool,setActiveTool]=useState('select');// 'select' | 'grab' | 'razor'
+const cachedSf=(instrumentSelectorData?.soundfonts||[]).find(s=>s.id===instrumentId||s.id===sfIdParam);if(cachedSf&&cachedSf.presets){setSfPresets(cachedSf.presets);}else{window.SonicAPI.listSoundfontInstruments(sfIdParam).then(data=>setSfPresets(data.presets||[])).catch(e=>{console.error('listSoundfontInstruments failed:',e);setSfPresets([]);});}}else{setTrackInstrumentWithUndo(trackId,instrumentId,displayName);}};const[activeTool,setActiveTool]=useState('select');// 'select' | 'grab' | 'razor'
 const[snapValue,setSnapValue]=useState('free');// 'free', '1', '1/2', '1/4', '1/8', '1/16', '1/32'
 const snapTime=(time,snapVal,bpmVal)=>{if(snapVal==='free')return time;const beatDuration=60/parseFloat(bpmVal||120);let divisor=1;if(snapVal==='4')divisor=4;else if(snapVal==='1')divisor=1;else if(snapVal==='1/2')divisor=0.5;else if(snapVal==='1/4')divisor=0.25;else if(snapVal==='1/8')divisor=0.125;else if(snapVal==='1/16')divisor=0.0625;else if(snapVal==='1/32')divisor=0.03125;const gridSpacing=beatDuration*divisor;return Math.round(time/gridSpacing)*gridSpacing;};const snapValueRef=useRef(snapValue);snapValueRef.current=snapValue;const bpmRef=useRef(bpm);bpmRef.current=bpm;// BMP for Tempo Track - LOOP_EDITOR_2.md §6
 const[selectedTrackId,setSelectedTrackId]=useState('1');const[selectedItemIds,setSelectedItemIds]=useState(new Set());const selectedItemIdsRef=useRef(new Set());selectedItemIdsRef.current=selectedItemIds;const[currentTime,setCurrentTime]=useState(0);const[isPlaying,setIsPlaying]=useState(false);const[selectionStart,setSelectionStart]=useState(null);const[selectionEnd,setSelectionEnd]=useState(null);const[selectionFollowsTempo,setSelectionFollowsTempo]=useState(true);const selectionRef=useRef({start:null,end:null});selectionRef.current={start:selectionStart,end:selectionEnd};const[selectionMode,setSelectionMode]=useState(null);// 'global' (from ruler) | 'local' (from track)
@@ -205,16 +205,15 @@ const midiCh=msg.data[0]&0x0F;if(cmd===0xB){// Controller Change: forward to ALL
 const cc=msg.data[1];const val=msg.data[2];if(window.SonicSF&&window.SonicSF.controllerChange){var ccTracks=activeTracksRef.current||[];var hasArmed=ccTracks.some(function(t){return t.isArmed;});if(hasArmed){ccTracks.forEach(function(ct){if(!ct.isArmed)return;var ctCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(ct,ccTracks):ct.midiChannel!==undefined?ct.midiChannel:0;window.SonicSF.controllerChange(ctCh,cc,val);});}else{window.SonicSF.controllerChange(midiCh,cc,val);}}}else if(cmd===0xE){// Pitch Bend: forward to ALL armed tracks' dedicated channels
 const lsb=msg.data[1];const msb=msg.data[2];const bendVal=msb<<7|lsb;if(window.SonicSF&&window.SonicSF.pitchBend){var pbTracks=activeTracksRef.current||[];var hasArmedPB=pbTracks.some(function(t){return t.isArmed;});if(hasArmedPB){pbTracks.forEach(function(pt){if(!pt.isArmed)return;var ptCh=window.SonicPianoRoll?window.SonicPianoRoll.getTrackMidiChannel(pt,pbTracks):pt.midiChannel!==undefined?pt.midiChannel:0;window.SonicSF.pitchBend(ptCh,bendVal);});}else{window.SonicSF.pitchBend(midiCh,bendVal);}}}// Forward to active MIDI recorders
 if(activeMIDIRecordersRef.current){for(let trackId in activeMIDIRecordersRef.current){const rec=activeMIDIRecordersRef.current[trackId];if(rec){rec.handleMIDIMessage(msg,input.id);}}}};}setMidiDevices(inputs);access.onstatechange=()=>{const inputs=[];for(let input of access.inputs.values()){inputs.push(input);}setMidiDevices(inputs);};}).catch(err=>console.log('MIDI access error:',err));}},[]);const[showAIConfig,setShowAIConfig]=useState(false);const[recordingState,setRecordingState]=useState('IDLE');// 'IDLE' | 'COUNT_IN' | 'RECORDING'
-const[recTempMidiNotes,setRecTempMidiNotes]=useState([]);const[recTempAudioBuffer,setRecTempAudioBuffer]=useState(null);const[recStartTimelineTime,setRecStartTimelineTime]=useState(0);const[canvasRedrawCount,setCanvasRedrawCount]=useState(0);const[lastMidiNote,setLastMidiNote]=useState(null);const lastMidiNoteRef=useRef(null);const activeMIDIRecordersRef=useRef({});const activeAudioRecordersRef=useRef({});const pianoRollRecorderRef=useRef(null);const activeMidiPitchesRef=useRef(new Set());const[activeMidiPitches,setActiveMidiPitches]=useState(new Set());const recordingPCMDataRef=useRef({});const recordingStartTimeRef=useRef(0);const recordingSyncRef=useRef(null);const recordingStateRef=useRef(recordingState);recordingStateRef.current=recordingState;const lastTempCompileTimeRef=useRef(0);const nextMetronomeBeatRef=useRef(0);const[showExportPanel,setShowExportPanel]=useState(false);const[showAIPanel,setShowAIPanel]=useState(true);const[showSelectionPanel,setShowSelectionPanel]=useState(false);const[showPythonToolsPanel,setShowPythonToolsPanel]=useState(false);const[showMediaExplorer,setShowMediaExplorer]=useState(false);const[scrollBufferExtra,setScrollBufferExtra]=useState(0);const scrollBufferExtraRef=useRef(0);scrollBufferExtraRef.current=scrollBufferExtra;const[showFxRack,setShowFxRack]=useState(false);const[showMidiEvents,setShowMidiEvents]=useState(false);const[showMixer,setShowMixer]=useState(false);const setShowMixerRef=useRef(setShowMixer);setShowMixerRef.current=setShowMixer;const[mixerHeight,setMixerHeight]=useState(function(){var saved=localStorage.getItem('studio_mixer_height');return saved?parseInt(saved):200;}());const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'16',format:'wav',source:'project',quality:'44khz',channels:'stereo'});const[serverStatus,setServerStatus]=useState('checking...');const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
+const[recTempMidiNotes,setRecTempMidiNotes]=useState([]);const[recTempAudioBuffer,setRecTempAudioBuffer]=useState(null);const[recStartTimelineTime,setRecStartTimelineTime]=useState(0);const[canvasRedrawCount,setCanvasRedrawCount]=useState(0);const[lastMidiNote,setLastMidiNote]=useState(null);const lastMidiNoteRef=useRef(null);const activeMIDIRecordersRef=useRef({});const activeAudioRecordersRef=useRef({});const pianoRollRecorderRef=useRef(null);const activeMidiPitchesRef=useRef(new Set());const[activeMidiPitches,setActiveMidiPitches]=useState(new Set());const recordingPCMDataRef=useRef({});const recordingStartTimeRef=useRef(0);const recordingSyncRef=useRef(null);const recordingStateRef=useRef(recordingState);recordingStateRef.current=recordingState;const lastTempCompileTimeRef=useRef(0);const nextMetronomeBeatRef=useRef(0);const[showExportPanel,setShowExportPanel]=useState(false);const[showAIPanel,setShowAIPanel]=useState(true);const[showSelectionPanel,setShowSelectionPanel]=useState(false);const[showPythonToolsPanel,setShowPythonToolsPanel]=useState(false);const[showMediaExplorer,setShowMediaExplorer]=useState(false);const[scrollBufferExtra,setScrollBufferExtra]=useState(0);const scrollBufferExtraRef=useRef(0);scrollBufferExtraRef.current=scrollBufferExtra;const[showFxRack,setShowFxRack]=useState(false);const[showMidiEvents,setShowMidiEvents]=useState(false);const[showMixer,setShowMixer]=useState(false);const setShowMixerRef=useRef(setShowMixer);setShowMixerRef.current=setShowMixer;const[mixerHeight,setMixerHeight]=useState(function(){var saved=localStorage.getItem('studio_mixer_height');return saved?parseInt(saved):200;}());const[rightSidebarWidth,setRightSidebarWidth]=useState(320);const[tcpWidth,setTcpWidth]=useState(320);const[mediaExplorerHeight,setMediaExplorerHeight]=useState(50);const[panelPositions,setPanelPositions]=useState({export:'bottom',ai:'right',python_tools:'bottom',selection:'bottom',media_explorer:'bottom',fx_rack:'bottom',midi_events:'bottom'});const[panelDropZone,setPanelDropZone]=useState(null);const[dragGhostPos,setDragGhostPos]=useState(null);const[dragGhostPanel,setDragGhostPanel]=useState(null);const panelDragRef=useRef(null);const trackVuRefs=useRef({});const workspaceRef=useRef(null);const colResizerRef=useRef(null);const rowResizerRef=useRef(null);const[aiConfig,setAiConfig]=useState({baseUrl:localStorage.getItem('ai_base_url')||`${API_BASE_URL}`,apiKey:localStorage.getItem('ai_api_key')||'',model:localStorage.getItem('ai_model')||'deepseek-chat'});const[aiProviders,setAiProviders]=useState([]);useEffect(()=>{(async()=>{try{const data=await window.SonicAPI.getAIConfigs();if(data&&data.providers){setAiProviders(data.providers);const active=data.providers.find(p=>p.is_active)||data.providers[0];if(active)setSelectedProviderId(active.id);}}catch(e){/* server may not have config endpoint */}})();},[]);const[analysisState,setAnalysisState]=useState({status:'Sẵn sàng. Chạy AI để phân tích nhịp.',data:null,isRunning:false});const[aiPrompt,setAiPrompt]=useState('');const[promptHistory,setPromptHistory]=useState([]);const[promptHistIdx,setPromptHistIdx]=useState(-1);const promptHistRef=useRef([]);const aiPromptUndoRef=useRef({stack:[],idx:-1,max:30});const aiPromptUndoPush=text=>{const u=aiPromptUndoRef.current;u.stack.push(text);if(u.stack.length>u.max)u.stack.shift();u.idx=u.stack.length-1;};const[aiProvider,setAiProvider]=useState('OpenAI');const[aiModel,setAiModel]=useState('GPT-4o');const[aiActionLog,setAiActionLog]=useState([]);const actionLogContainerRef=useRef(null);useEffect(()=>{if(actionLogContainerRef.current){actionLogContainerRef.current.scrollTop=actionLogContainerRef.current.scrollHeight;}},[aiActionLog]);const[aiProcessing,setAiProcessing]=useState(false);const[aiSuggestions,setAiSuggestions]=useState([]);const[showAiTypeahead,setShowAiTypeahead]=useState(false);const[showAISuggestions,setShowAISuggestions]=useState(true);const[showAIActionLog,setShowAIActionLog]=useState(false);const aiPromptMgrRef=useRef(null);const aiTypeaheadRef=useRef(null);const[selectedProviderId,setSelectedProviderId]=useState('');const[exportSettings,setExportSettings]=useState({sampleRate:'44100',bitDepth:'16',format:'wav',source:'project',quality:'44khz',channels:'stereo'});const[serverStatus,setServerStatus]=useState('checking...');const[menuOpen,setMenuOpen]=useState(null);const[selectedClipId,setSelectedClipId]=useState(null);// { trackId, clipId }
 const[stretchedClip,setStretchedClip]=useState(null);// { trackId, clipId, originalDuration, startTime, originalSpeed, beforeSnap }
 const[draggedSectionItem,setDraggedSectionItem]=useState(null);const[resizedSectionItem,setResizedSectionItem]=useState(null);const[editingTrackName,setEditingTrackName]=useState(null);// trackId being edited
 const[editingClipName,setEditingClipName]=useState(null);// { trackId, clipId }
 const[editNameInput,setEditNameInput]=useState('');// ── Context Menu & Clipboard ──
 const[contextMenu,setContextMenu]=useState(null);// { x, y, trackId }
 const clipboardRef=useRef(null);// { buffer, name, volume, color } for copy/paste
-// ── Undo/Redo Engine (LOOP_EDITOR.md §4) ──
-const[undoStack,setUndoStack]=useState([]);const[redoStack,setRedoStack]=useState([]);const MAX_UNDO=30;const pushAction=(actionType,trackId,beforeState,afterState)=>{const node={action_type:actionType,track_id:trackId,timestamp:Date.now(),before_state:beforeState,after_state:afterState};setUndoStack(prev=>{const next=[...prev,node];if(next.length>MAX_UNDO)next.shift();return next;});setRedoStack([]);};const handleUndo=()=>{if(undoStack.length===0)return;const last=undoStack[undoStack.length-1];setUndoStack(prev=>prev.slice(0,-1));setRedoStack(prev=>[...prev,last]);applyTrackState(last.track_id,last.before_state);showToast(`Undo: ${last.action_type}`,'info');};const handleRedo=()=>{if(redoStack.length===0)return;const last=redoStack[redoStack.length-1];setRedoStack(prev=>prev.slice(0,-1));setUndoStack(prev=>[...prev,last]);applyTrackState(last.track_id,last.after_state);showToast(`Redo: ${last.action_type}`,'info');};const applyTrackState=(trackId,state)=>{updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;return{...t,...state};}));};const getSelectedMidiItemInfo=()=>{if(!selectedItemIds||selectedItemIds.size!==1)return null;const selId=selectedItemIds.values().next().value;const tlist=activeTracks||tracks||[];for(const t of tlist){const found=(t.midiItems||[]).find(m=>m.id===selId);if(found)return{itemName:found.name,trackName:t.name,trackId:t.id,itemId:selId};}return null;};const captureTrackSnapshot=trackId=>{const track=activeTracks.find(t=>t.id===trackId);if(!track)return null;return{volumeDb:track.volumeDb,pan:track.pan,muted:track.muted,name:track.name,markers:JSON.parse(JSON.stringify(track.markers||[])),// buffer is captured via reference copy for undo; we store a clone for redo
-buffer:track.buffer,startTime:track.startTime||0,clips:track.clips?track.clips.map(c=>({id:c.id,buffer:c.buffer,startTime:c.startTime,name:c.name})):null};};// ── Tab System (LOOP_EDITOR_2.md §1) ──
+// ── Undo/Redo Engine (LOOP_EDITOR.md §4 + Global Extension) ──
+const[undoStack,setUndoStack]=useState([]);const[redoStack,setRedoStack]=useState([]);const MAX_UNDO=30;const pushAction=(actionType,trackId,beforeState,afterState)=>{const node={action_type:actionType,track_id:trackId,timestamp:Date.now(),before_state:beforeState,after_state:afterState};setUndoStack(prev=>{const next=[...prev,node];if(next.length>MAX_UNDO)next.shift();return next;});setRedoStack([]);};const handleUndo=()=>{if(window.UndoRedoEngine&&window.UndoRedoEngine.canUndo()){const entry=window.UndoRedoEngine.undo();if(entry){if(entry.undo&&typeof entry.undo==='function')entry.undo(entry);showToast(`Undo: ${entry.label||entry.type}`,'info');return;}}if(undoStack.length===0)return;const last=undoStack[undoStack.length-1];setUndoStack(prev=>prev.slice(0,-1));setRedoStack(prev=>[...prev,last]);applyTrackState(last.track_id,last.before_state);showToast(`Undo: ${last.action_type}`,'info');};const handleRedo=()=>{if(window.UndoRedoEngine&&window.UndoRedoEngine.canRedo()){const entry=window.UndoRedoEngine.redo();if(entry){if(entry.redo&&typeof entry.redo==='function')entry.redo(entry);showToast(`Redo: ${entry.label||entry.type}`,'info');return;}}if(redoStack.length===0)return;const last=redoStack[redoStack.length-1];setRedoStack(prev=>prev.slice(0,-1));setUndoStack(prev=>[...prev,last]);applyTrackState(last.track_id,last.after_state);showToast(`Redo: ${last.action_type}`,'info');};const applyTrackState=(trackId,state)=>{updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;return{...t,...state};}));};const getSelectedMidiItemInfo=()=>{if(!selectedItemIds||selectedItemIds.size!==1)return null;const selId=selectedItemIds.values().next().value;const tlist=activeTracks||tracks||[];for(const t of tlist){const found=(t.midiItems||[]).find(m=>m.id===selId);if(found)return{itemName:found.name,trackName:t.name,trackId:t.id,itemId:selId};}return null;};const captureTrackSnapshot=trackId=>{const track=activeTracks.find(t=>t.id===trackId);if(!track)return null;return{volumeDb:track.volumeDb,pan:track.pan,muted:track.muted,name:track.name,markers:JSON.parse(JSON.stringify(track.markers||[])),buffer:track.buffer,startTime:track.startTime||0,clips:track.clips?track.clips.map(c=>({id:c.id,buffer:c.buffer,startTime:c.startTime,name:c.name})):null};};const setBpmWithUndo=newBpm=>{const oldBpm=bpmRef.current;if(String(oldBpm)===String(newBpm))return;const entry={type:'SET_BPM',scope:'global',label:`BPM ${oldBpm} → ${newBpm}`,before:oldBpm,after:newBpm,undo:e=>{setBpm(e.before);showToast(`Undo: BPM → ${e.before}`,'info');},redo:e=>{setBpm(e.after);showToast(`Redo: BPM → ${e.after}`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);setBpm(String(newBpm));};const setPlayheadWithUndo=newTime=>{const oldTime=currentTime;if(Math.abs(oldTime-newTime)<0.001)return;const entry={type:'SET_PLAYHEAD',scope:'global',label:`Playhead ${formatTimeSimple(oldTime)} → ${formatTimeSimple(newTime)}`,before:oldTime,after:newTime,undo:e=>{applyPlayheadDirect(e.before);showToast(`Undo: Playhead`,'info');},redo:e=>{applyPlayheadDirect(e.after);showToast(`Redo: Playhead`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);applyPlayheadDirect(newTime);};const applyPlayheadDirect=time=>{localSelectionAnchorRef.current=time;if(isPlaying){setCurrentTime(time);stopAllPlayback();setTimeout(()=>{startOffsetTimeRef.current=time;startAudioTimeRef.current=getAudioContext().currentTime;startTrackPlayback(time);setIsPlaying(true);},50);}else{setCurrentTime(time);}};const setSelectionWithUndo=(newStart,newEnd,mode)=>{const oldStart=selectionRef.current.start;const oldEnd=selectionRef.current.end;const oldMode=selectionMode;if(oldStart===newStart&&oldEnd===newEnd&&oldMode===mode)return;const entry={type:'SET_SELECTION',scope:'global',label:`Selection`,before:{start:oldStart,end:oldEnd,mode:oldMode},after:{start:newStart,end:newEnd,mode:mode},undo:e=>{setSelectionStart(e.before.start);setSelectionEnd(e.before.end);setSelectionMode(e.before.mode);showToast(`Undo: Selection`,'info');},redo:e=>{setSelectionStart(e.after.start);setSelectionEnd(e.after.end);setSelectionMode(e.after.mode);showToast(`Redo: Selection`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);setSelectionStart(newStart);setSelectionEnd(newEnd);if(mode!==undefined)setSelectionMode(mode);};const setSelectedItemsWithUndo=newSet=>{const oldSet=selectedItemIdsRef.current;if(oldSet&&newSet&&oldSet.size===newSet.size&&[...oldSet].every(x=>newSet.has(x)))return;const entry={type:'SELECT_ITEMS',scope:'global',label:`Selection`,before:[...oldSet],after:[...newSet],undo:e=>{setSelectedItemIds(new Set(e.before));showToast(`Undo: Selection`,'info');},redo:e=>{setSelectedItemIds(new Set(e.after));showToast(`Redo: Selection`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);setSelectedItemIds(newSet);};const setAiPromptWithUndo=newText=>{const oldText=aiPrompt;if(oldText===newText)return;const entry={type:'SET_AI_PROMPT',scope:'global',label:`AI Prompt`,before:oldText,after:newText,undo:e=>{setAiPrompt(e.before);showToast(`Undo: AI Prompt`,'info');},redo:e=>{setAiPrompt(e.after);showToast(`Redo: AI Prompt`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);setAiPrompt(newText);};const setTrackInstrumentWithUndo=(trackId,instrumentId,displayName,bankNumber,programNumber)=>{const track=activeTracks.find(t=>t.id===trackId);if(!track)return;const oldInstrumentId=track.instrumentId;const oldInstrumentName=track.instrumentName;if(oldInstrumentId===instrumentId&&oldInstrumentName===displayName)return;const entry={type:'SET_INSTRUMENT',scope:'track:'+trackId,label:`Instrument ${track.name}`,before:{instrumentId:oldInstrumentId,instrumentName:oldInstrumentName,bankNumber:track.soundfont_bank,programNumber:track.instrumentProgram},after:{instrumentId,instrumentName:displayName,bankNumber,programNumber},undo:e=>{setTrackInstrumentWithProgram(trackId,e.before.instrumentId,e.before.programNumber,e.before.instrumentName,e.before.bankNumber);showToast(`Undo: Instrument`,'info');},redo:e=>{setTrackInstrumentWithProgram(trackId,e.after.instrumentId,e.after.programNumber,e.after.instrumentName,e.after.bankNumber);showToast(`Redo: Instrument`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);setTrackInstrumentWithProgram(trackId,instrumentId,programNumber,displayName,bankNumber);};const createSectionWithUndo=(trackId,section)=>{const entry={type:'CREATE_SECTION',scope:'track:'+trackId,label:`Create Section`,before:null,after:section,undo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,sections:(t.sections||[]).filter(s=>s.id!==e.after.id)}:t));showToast(`Undo: Create Section`,'info');},redo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,sections:[...(t.sections||[]),e.after]}:t));showToast(`Redo: Create Section`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);};const createMidiWithUndo=(trackId,midiItem)=>{const entry={type:'CREATE_MIDI',scope:'track:'+trackId,label:`Create MIDI Item`,before:null,after:midiItem,undo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,midiItems:(t.midiItems||[]).filter(m=>m.id!==e.after.id)}:t));showToast(`Undo: Create MIDI`,'info');},redo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,midiItems:[...(t.midiItems||[]),e.after]}:t));showToast(`Redo: Create MIDI`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);};const createClipWithUndo=(trackId,clip)=>{const entry={type:'CREATE_CLIP',scope:'track:'+trackId,label:`Create Audio Clip`,before:null,after:clip,undo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,clips:(t.clips||[]).filter(c=>c.id!==e.after.id),buffer:(t.clips||[]).filter(c=>c.id!==e.after.id)[0]?.buffer||null,startTime:(t.clips||[]).filter(c=>c.id!==e.after.id)[0]?.startTime||0,name:(t.clips||[]).filter(c=>c.id!==e.after.id)[0]?.name||t.name}:t));showToast(`Undo: Create Clip`,'info');},redo:e=>{updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,clips:[...(t.clips||[]),e.after]}:t));showToast(`Redo: Create Clip`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);};const deleteTrackWithUndo=(trackId,trackData)=>{const entry={type:'DELETE_TRACK',scope:'global',label:`Delete Track`,before:trackData,after:null,undo:e=>{if(e.before){setTracks(prev=>[...prev,e.before]);showToast(`Undo: Delete Track`,'info');}},redo:e=>{setTracks(prev=>prev.filter(t=>t.id!==trackId));showToast(`Redo: Delete Track`,'info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);};// ── Tab System (LOOP_EDITOR_2.md §1) ──
 const[activeTab,setActiveTab]=useState('main');const[subTabSelectedNodeTime,setSubTabSelectedNodeTime]=useState(null);const[subTabNormVal,setSubTabNormVal]=useState(0);const[subTabGainVal,setSubTabGainVal]=useState(100);const[subTabPitchVal,setSubTabPitchVal]=useState(0);const[subTabs,setSubTabs]=useState([]);// [{id, label, trackId, startTime, endTime, buffer, effects, currentTime, selectionStart, selectionEnd, isPlaying}, ...]
 const[sessionTabs,setSessionTabs]=useState([]);// [{id, name, tracks}, ...]
 const[tabContextMenu,setTabContextMenu]=useState(null);// { x, y, tabId, tabType }
@@ -235,7 +234,7 @@ const handleUndoRef=useRef(handleUndo);const handleRedoRef=useRef(handleRedo);ha
 const segmentData=data.subarray(startSample,endSample);const addedSamples=len*(loopCount-1);const newBuffer=ctx.createBuffer(1,data.length+addedSamples,sr);const newData=newBuffer.getChannelData(0);let idx=0;for(let i=0;i<endSample;i++)newData[idx++]=data[i];for(let n=0;n<loopCount-1;n++){for(let i=0;i<len;i++)newData[idx++]=segmentData[i];}for(let i=endSample;i<data.length;i++)newData[idx++]=data[i];setSubTabs(prev=>prev.map(s=>s.id===tabId?{...s,buffer:newBuffer,selectionStart:null,selectionEnd:null}:s));showToast(`Đã lặp vùng chọn ${loopCount} lần.`,'success');};useEffect(()=>{const handler=e=>{// Bypass global hotkeys when typing inside input/textarea/contentEditable elements
 if(e.target&&(e.target.tagName==='INPUT'||e.target.tagName==='TEXTAREA'||e.target.isContentEditable)){return;}const ctrl=e.ctrlKey||e.metaKey;const alt=e.altKey;// Global space play/pause shortcut for transport
 if(e.key===' '||e.code==='Space'){e.preventDefault();if(recordingStateRef.current==='RECORDING'||recordingStateRef.current==='COUNT_IN'){handleRecordClickRef.current();return;}if(handlePlayPauseRef.current)handlePlayPauseRef.current();return;}if(activeTabRef.current!=='main'&&!activeTabRef.current.startsWith('session_')){// Sub-Tab keyboard shortcuts mapping
-const curTabId=activeTabRef.current;if(ctrl&&alt&&e.key==='n'){e.preventDefault();handleSubTabNormalize(curTabId);return;}if(e.key==='f'||e.key==='F'){e.preventDefault();handleSubTabFade(curTabId,'in');return;}if(e.key==='g'||e.key==='G'){e.preventDefault();handleSubTabFade(curTabId,'out');return;}if(ctrl&&e.key==='l'){e.preventDefault();handleSubTabLoop(curTabId,4);return;}if(e.key==='v'||e.key==='V'){e.preventDefault();const val=prompt("Nhập Gain điều chỉnh (dB):","0");if(val)handleSubTabGain(curTabId,parseFloat(val)||0);return;}if(ctrl&&e.key==='x'){e.preventDefault();handleSubTabCut(curTabId);return;}if(ctrl&&e.key==='c'){e.preventDefault();handleSubTabCopy(curTabId);return;}if(ctrl&&e.key==='v'){e.preventDefault();handleSubTabPaste(curTabId);return;}if(e.key==='Delete'||e.key==='Backspace'||e.key==='Del'){e.preventDefault();if(subTabSelectedNodeTimeRef.current!==null){const selTime=subTabSelectedNodeTimeRef.current;setSubTabs(prev=>prev.map(s=>{if(s.id!==curTabId)return s;const curNodes=s.graphMode==='pan'?s.panningNodes||[]:s.volumeNodes||[];const updated=curNodes.filter(n=>n.time!==selTime);return{...s,[s.graphMode==='pan'?'panningNodes':'volumeNodes']:updated};}));setSubTabSelectedNodeTime(null);}else{handleSubTabDelete(curTabId);}return;}return;}if(ctrl&&e.key==='z'&&!e.shiftKey){e.preventDefault();handleUndoRef.current();return;}if(ctrl&&(e.key==='y'||e.key==='z'&&e.shiftKey)){e.preventDefault();handleRedoRef.current();return;}if(ctrl&&!alt&&e.key==='o'){e.preventDefault();handleImportSFS();return;}if(ctrl&&!alt&&e.key==='n'){e.preventDefault();setTracks([{id:'1',name:'Track 01',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#0f766e',markers:[],serverFileId:null},{id:'2',name:'Track 02',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#1d4ed8',markers:[],serverFileId:null}]);setSelectedTrackId('1');showToast('New project created','info');return;}if(ctrl&&!alt&&!e.shiftKey&&e.key==='a'){e.preventDefault();const curTab=activeTabRef.current;if(curTab!=='main'&&!curTab.startsWith('session_'))return;const allIds=new Set();(activeTracksRef.current||[]).forEach(t=>{(t.sections||[]).forEach(s=>allIds.add(s.id));(t.midiItems||[]).forEach(m=>allIds.add(m.id));const clips=t.clips&&t.clips.length>0?t.clips:t.buffer?[{id:'default',buffer:t.buffer,startTime:t.startTime||0,name:t.name,speed:t.speed||1.0}]:[];clips.forEach(c=>allIds.add(c.id==='default'?'default_'+t.id:c.id));});setSelectedItemIds(allIds);return;}if(ctrl&&!alt&&e.key==='s'){e.preventDefault();var curTab=activeTabRef.current;if(curTab.startsWith('session_')){handleSaveSectionTabRef.current(curTab);showToast('Đã lưu Section','success');}else{handleExportSFS();}return;}if(ctrl&&alt&&e.key==='s'||ctrl&&e.shiftKey&&e.key==='s'){e.preventDefault();handleExportSFS();return;}if(ctrl&&!alt&&e.key==='i'){e.preventDefault();addNewTrack();return;}if(ctrl&&alt&&e.key==='i'){e.preventDefault();showToast('Import audio','info');return;}if(ctrl&&!alt&&e.key==='e'){e.preventDefault();openTempTab();return;}if(ctrl&&!alt&&e.key==='m'){e.preventDefault();handleMergeTracks();return;}if(ctrl&&!alt&&e.key==='c'){e.preventDefault();handleCopyTrack();return;}if(ctrl&&!alt&&e.key==='x'){e.preventDefault();handleCutTrack();return;}if(ctrl&&!alt&&e.key==='v'){e.preventDefault();handlePasteTrack();return;}if(e.key==='Delete'||e.key==='Backspace'||e.key==='Del'){const selItems=selectedItemIdsRef.current;if(selItems.size>0){e.preventDefault();const idsToDelete=new Set(selItems);handleDeleteSelectedItemsRef.current(idsToDelete);return;}const selClip=selectedClipIdRef.current;if(selClip){e.preventDefault();const{trackId,clipId}=selClip;setTracks(prev=>{const track=prev.find(t=>t.id===trackId);if(!track)return prev;const beforeSnap=captureTrackSnapshotRef.current?captureTrackSnapshotRef.current(trackId):null;const updatedClips=(track.clips||[]).filter(c=>c.id!==clipId);const updatedTracks=prev.map(t=>{if(t.id===trackId){return{...t,clips:updatedClips,buffer:updatedClips.length>0?updatedClips[0].buffer:null,startTime:updatedClips.length>0?updatedClips[0].startTime:0,name:updatedClips.length>0?updatedClips[0].name:`Track ${t.id}`};}return t;});setTimeout(()=>{const afterSnap=captureTrackSnapshotRef.current?captureTrackSnapshotRef.current(trackId):null;pushAction('DELETE_CLIP',trackId,beforeSnap,afterSnap);},50);return updatedTracks;});setSelectedClipId(null);showToast('Đã xóa clip.','info');return;}else{e.preventDefault();handleDeleteTrackRef.current();return;}}if(ctrl&&!alt&&e.key==='s'){e.preventDefault();const curTab=activeTabRef.current;if(curTab==='main'){// Main session: save project + save all dirty sub-tabs
+const curTabId=activeTabRef.current;if(ctrl&&alt&&e.key==='n'){e.preventDefault();handleSubTabNormalize(curTabId);return;}if(e.key==='f'||e.key==='F'){e.preventDefault();handleSubTabFade(curTabId,'in');return;}if(e.key==='g'||e.key==='G'){e.preventDefault();handleSubTabFade(curTabId,'out');return;}if(ctrl&&e.key==='l'){e.preventDefault();handleSubTabLoop(curTabId,4);return;}if(e.key==='v'||e.key==='V'){e.preventDefault();const val=prompt("Nhập Gain điều chỉnh (dB):","0");if(val)handleSubTabGain(curTabId,parseFloat(val)||0);return;}if(ctrl&&e.key==='x'){e.preventDefault();handleSubTabCut(curTabId);return;}if(ctrl&&e.key==='c'){e.preventDefault();handleSubTabCopy(curTabId);return;}if(ctrl&&e.key==='v'){e.preventDefault();handleSubTabPaste(curTabId);return;}if(e.key==='Delete'||e.key==='Backspace'||e.key==='Del'){e.preventDefault();if(subTabSelectedNodeTimeRef.current!==null){const selTime=subTabSelectedNodeTimeRef.current;setSubTabs(prev=>prev.map(s=>{if(s.id!==curTabId)return s;const curNodes=s.graphMode==='pan'?s.panningNodes||[]:s.volumeNodes||[];const updated=curNodes.filter(n=>n.time!==selTime);return{...s,[s.graphMode==='pan'?'panningNodes':'volumeNodes']:updated};}));setSubTabSelectedNodeTime(null);}else{handleSubTabDelete(curTabId);}return;}return;}if(ctrl&&e.key==='z'&&!e.shiftKey){const tag=document.activeElement?.tagName;if(tag==='INPUT'||tag==='TEXTAREA')return;e.preventDefault();handleUndoRef.current();return;}if(ctrl&&(e.key==='y'||e.key==='z'&&e.shiftKey)){const tag=document.activeElement?.tagName;if(tag==='INPUT'||tag==='TEXTAREA')return;e.preventDefault();handleRedoRef.current();return;}if(ctrl&&!alt&&e.key==='o'){e.preventDefault();handleImportSFS();return;}if(ctrl&&!alt&&e.key==='n'){e.preventDefault();setTracks([{id:'1',name:'Track 01',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#0f766e',markers:[],serverFileId:null},{id:'2',name:'Track 02',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#1d4ed8',markers:[],serverFileId:null}]);setSelectedTrackId('1');showToast('New project created','info');return;}if(ctrl&&!alt&&!e.shiftKey&&e.key==='a'){e.preventDefault();const curTab=activeTabRef.current;if(curTab!=='main'&&!curTab.startsWith('session_'))return;captureSelectionUndo();const allIds=new Set();(activeTracksRef.current||[]).forEach(t=>{(t.sections||[]).forEach(s=>allIds.add(s.id));(t.midiItems||[]).forEach(m=>allIds.add(m.id));const clips=t.clips&&t.clips.length>0?t.clips:t.buffer?[{id:'default',buffer:t.buffer,startTime:t.startTime||0,name:t.name,speed:t.speed||1.0}]:[];clips.forEach(c=>allIds.add(c.id==='default'?'default_'+t.id:c.id));});setSelectedItemIds(allIds);pushSelectionUndo();return;}if(ctrl&&!alt&&e.key==='s'){e.preventDefault();var curTab=activeTabRef.current;if(curTab.startsWith('session_')){handleSaveSectionTabRef.current(curTab);showToast('Đã lưu Section','success');}else{handleExportSFS();}return;}if(ctrl&&alt&&e.key==='s'||ctrl&&e.shiftKey&&e.key==='s'){e.preventDefault();handleExportSFS();return;}if(ctrl&&!alt&&e.key==='i'){e.preventDefault();addNewTrack();return;}if(ctrl&&alt&&e.key==='i'){e.preventDefault();showToast('Import audio','info');return;}if(ctrl&&!alt&&e.key==='e'){e.preventDefault();openTempTab();return;}if(ctrl&&!alt&&e.key==='m'){e.preventDefault();handleMergeTracks();return;}if(ctrl&&!alt&&e.key==='c'){e.preventDefault();handleCopyTrack();return;}if(ctrl&&!alt&&e.key==='x'){e.preventDefault();handleCutTrack();return;}if(ctrl&&!alt&&e.key==='v'){e.preventDefault();handlePasteTrack();return;}if(e.key==='Delete'||e.key==='Backspace'||e.key==='Del'){const selItems=selectedItemIdsRef.current;if(selItems.size>0){e.preventDefault();const idsToDelete=new Set(selItems);handleDeleteSelectedItemsRef.current(idsToDelete);return;}const selClip=selectedClipIdRef.current;if(selClip){e.preventDefault();const{trackId,clipId}=selClip;setTracks(prev=>{const track=prev.find(t=>t.id===trackId);if(!track)return prev;const beforeSnap=captureTrackSnapshotRef.current?captureTrackSnapshotRef.current(trackId):null;const updatedClips=(track.clips||[]).filter(c=>c.id!==clipId);const updatedTracks=prev.map(t=>{if(t.id===trackId){return{...t,clips:updatedClips,buffer:updatedClips.length>0?updatedClips[0].buffer:null,startTime:updatedClips.length>0?updatedClips[0].startTime:0,name:updatedClips.length>0?updatedClips[0].name:`Track ${t.id}`};}return t;});setTimeout(()=>{const afterSnap=captureTrackSnapshotRef.current?captureTrackSnapshotRef.current(trackId):null;pushAction('DELETE_CLIP',trackId,beforeSnap,afterSnap);},50);return updatedTracks;});setSelectedClipId(null);showToast('Đã xóa clip.','info');return;}else{e.preventDefault();handleDeleteTrackRef.current();return;}}if(ctrl&&!alt&&e.key==='s'){e.preventDefault();const curTab=activeTabRef.current;if(curTab==='main'){// Main session: save project + save all dirty sub-tabs
 handleSaveProject();subTabsRef.current.filter(s=>s.isDirty).forEach(st=>{if(st.type==='PIANO_ROLL'){handleSaveMidiNotes(st.id,st.trackId,st.target_id,st.notes||[]);}else if(st.type==='SECTION'){handleSaveSectionTab(st.id);}else if(st.buffer){// Audio clip sub-tab: save buffer to track
 const subTrack=activeTracksRef.current.find(t=>t.id===st.trackId);if(subTrack){updateActiveTracks(prev=>prev.map(t=>t.id===st.trackId?{...t,buffer:st.buffer}:t));}}showToast('Đã lưu','success');});}else if(curTab.startsWith('session_')){// Section tab: save section
 handleSaveSectionTabRef.current(curTab);showToast('Đã lưu Section','success');}else{// Sub-tab: save current tab
@@ -277,7 +276,7 @@ clipboardRef.current={buffer:t.buffer,name:t.name,volumeDb:t.volumeDb,pan:t.pan,
 if(selLeft!==null&&selRight!==null&&selRight>selLeft){const trackStart=t.startTime||0;const relSelLeft=Math.max(0,selLeft-trackStart);const relSelRight=Math.max(0,selRight-trackStart);const startSample=Math.floor(relSelLeft*sr);const endSample=Math.min(data.length,Math.floor(relSelRight*sr));const len=endSample-startSample;if(len>0){// Copy selection to clipboard
 const ctx=getAudioContext();const clipBuffer=ctx.createBuffer(1,len,sr);clipBuffer.copyToChannel(data.subarray(startSample,endSample),0);clipboardRef.current={buffer:clipBuffer,name:t.name,volumeDb:t.volumeDb,color:t.color};// Remove selection from track, glue the two remaining parts
 const newLen=data.length-len;const newBuffer=ctx.createBuffer(1,newLen,sr);const newData=newBuffer.getChannelData(0);let idx=0;for(let i=0;i<startSample;i++)newData[idx++]=data[i];for(let i=endSample;i<data.length;i++)newData[idx++]=data[i];updateActiveTracks(p=>p.map(tr=>tr.id===selectedTrackId?{...tr,buffer:newBuffer}:tr));const afterSnap=captureTrackSnapshot(selectedTrackId);pushAction('CUT',selectedTrackId,beforeSnap,afterSnap);showToast('Cut selection to clipboard.','info');return;}}// No selection: cut entire track (copy + delete)
-handleCopyTrack();handleDeleteTrack();};const handleDeleteTrack=()=>{const tid=selectedTrackId;const sessionTab=sessionTabs.find(s=>s.id===activeTab);if(sessionTab){updateActiveTracks(prev=>prev.filter(t=>t.id!==tid));setSelectedTrackId(activeTracks.filter(t=>t.id!==tid)[0]?.id||'1');}else{const curTracks=tracks;const track=curTracks.find(t=>t.id===tid);if(track&&track.sections&&track.sections.length>0){showToast('Không thể xoá track chứa Section item.','warning');return;}setTracks(p=>p.filter(t=>t.id!==tid));setSelectedTrackId(curTracks.filter(t=>t.id!==tid)[0]?.id||'1');}showToast('Deleted track.','info');};handleDeleteTrackRef.current=handleDeleteTrack;// ── Server Health Check ──
+handleCopyTrack();handleDeleteTrack();};const handleDeleteTrack=()=>{const tid=selectedTrackId;const sessionTab=sessionTabs.find(s=>s.id===activeTab);if(sessionTab){const trackData=activeTracks.find(t=>t.id===tid);if(trackData)deleteTrackWithUndo(tid,JSON.parse(JSON.stringify(trackData)));updateActiveTracks(prev=>prev.filter(t=>t.id!==tid));setSelectedTrackId(activeTracks.filter(t=>t.id!==tid)[0]?.id||'1');}else{const curTracks=tracks;const track=curTracks.find(t=>t.id===tid);if(track&&track.sections&&track.sections.length>0){showToast('Không thể xoá track chứa Section item.','warning');return;}if(track)deleteTrackWithUndo(tid,JSON.parse(JSON.stringify(track)));setTracks(p=>p.filter(t=>t.id!==tid));setSelectedTrackId(curTracks.filter(t=>t.id!==tid)[0]?.id||'1');}showToast('Deleted track.','info');};handleDeleteTrackRef.current=handleDeleteTrack;// ── Server Health Check ──
 const[viewportWidth,setViewportWidth]=useState(1200);useEffect(()=>{if(!timelineWrapperNode)return;const observer=new ResizeObserver(entries=>{for(let entry of entries){setViewportWidth(entry.contentRect.width);}});observer.observe(timelineWrapperNode);return()=>observer.disconnect();},[timelineWrapperNode]);useEffect(()=>{fetch(API_BASE_URL).then(r=>{if(r.ok)setServerStatus('connected');else setServerStatus('error');}).catch(()=>setServerStatus('offline'));},[]);// ── Computed Values ──
 const leadInMargin=0;const leadInMarginRef=useRef(0);leadInMarginRef.current=0;const maxDuration=useMemo(()=>{const secPerBar=60.0/(parseInt(bpm)||120)*4;const cur=activeTracks;let max=10;cur.forEach(t=>{const clips=t.clips&&t.clips.length>0?t.clips:t.buffer?[{id:'default',buffer:t.buffer,startTime:t.startTime||0,name:t.name,speed:t.speed||1.0}]:[];clips.forEach(c=>{if(c.buffer){const cStart=c.startTime||0;const cDur=c.buffer.duration/(c.speed||1.0);max=Math.max(max,cStart+cDur);}});(t.midiItems||[]).forEach(m=>{max=Math.max(max,(m.startTime||0)+(m.duration||4));});(t.sections||[]).forEach(s=>{max=Math.max(max,(s.start||0)+(s.duration||4));});});if(recordingState==='RECORDING'||recordingState==='COUNT_IN'){max=Math.max(max,currentTime+60);}max+=secPerBar*12+scrollBufferExtra;return max;},[activeTracks,recordingState,currentTime,bpm,scrollBufferExtra]);const maxDurationRef=useRef(maxDuration);maxDurationRef.current=maxDuration;const minZoom=useMemo(()=>{return viewportWidth/maxDuration;},[viewportWidth,maxDuration]);const timelineWidth=useMemo(()=>{return Math.max(zoom*(maxDuration+leadInMargin),viewportWidth);},[zoom,maxDuration,viewportWidth,leadInMargin]);useEffect(()=>{if(zoom<minZoom){setZoom(minZoom);}},[minZoom]);const playheadLeftPos=useMemo(()=>(currentTime+leadInMargin)*zoom,[currentTime,zoom,leadInMargin]);const selLeft=useMemo(()=>{if(selectionMode==='local'&&localSelectionStart!==null&&localSelectionEnd!==null){return Math.max(0,Math.min(localSelectionStart,localSelectionEnd));}if(selectionStart===null||selectionEnd===null)return null;return Math.max(0,Math.min(selectionStart,selectionEnd));},[selectionStart,selectionEnd,selectionMode,localSelectionStart,localSelectionEnd]);const selRight=useMemo(()=>{if(selectionMode==='local'&&localSelectionStart!==null&&localSelectionEnd!==null){return Math.max(0,Math.max(localSelectionStart,localSelectionEnd));}if(selectionStart===null||selectionEnd===null)return null;return Math.max(0,Math.max(selectionStart,selectionEnd));},[selectionStart,selectionEnd,selectionMode,localSelectionStart,localSelectionEnd]);const dspSelectionStats=useMemo(()=>{const track=tracks.find(t=>t.id===selectedTrackId);if(!track)return null;const numChannels=track.buffer?track.buffer.numberOfChannels||1:0;if(selLeft===null||selRight===null||selRight<=selLeft||!track.buffer){return{trackName:track.name,channels:numChannels,timeRange:'Chưa chọn vùng',peakVolume:'N/A'};}const buffer=track.buffer;const sampleRate=buffer.sampleRate;const startSample=Math.max(0,Math.min(buffer.length-1,Math.floor(selLeft*sampleRate)));const endSample=Math.max(0,Math.min(buffer.length,Math.floor(selRight*sampleRate)));let maxVal=0;for(let c=0;c<numChannels;c++){const data=buffer.getChannelData(c);for(let i=startSample;i<endSample;i++){const val=Math.abs(data[i]);if(val>maxVal)maxVal=val;}}let peakDb='N/A';if(maxVal>0){const db=20*Math.log10(maxVal);peakDb=db.toFixed(2)+' dB';}else{peakDb='-∞ dB';}return{trackName:track.name,channels:numChannels,timeRange:`${selLeft.toFixed(2)}s - ${selRight.toFixed(2)}s (${(selRight-selLeft).toFixed(2)}s)`,peakVolume:peakDb};},[tracks,selectedTrackId,selLeft,selRight]);// ── Toast helper ──
 const showToast=(text,type='info',actionText=null,onActionClick=null)=>{if(toastTimeoutRef.current)clearTimeout(toastTimeoutRef.current);setToastMessage({text,type,actionText,onActionClick});toastTimeoutRef.current=setTimeout(()=>setToastMessage(null),actionText?8000:3500);};window.showToast=showToast;// ── Server-side upload ──
@@ -321,27 +320,24 @@ var ghostLayers=st.ghostPlayLayers||[];ghostLayers.forEach(function(layer){var g
 const st=subTabs.find(s=>s.id===activeTab);if(!st||!st.buffer&&st.type!=='PIANO_ROLL')return;if(st.isPlaying){stopAllPlayback();setSubTabs(prev=>prev.map(s=>s.id===activeTab?{...s,isPlaying:false}:s));}else{stopAllPlayback();const startOffset=st.currentTime||0;if(st.type==='PIANO_ROLL'){schedulePianoRollMidi(st,startOffset);startSubTabPlayback(st,startOffset);}else{startSubTabPlayback(st,startOffset);}setSubTabs(prev=>prev.map(s=>s.id===activeTab?{...s,isPlaying:true,currentTime:startOffset}:s));}return;}const context=getAudioContext();if(isPlaying){stopAllPlayback();}else{startOffsetTimeRef.current=currentTime;startAudioTimeRef.current=context.currentTime;startTrackPlayback(currentTime);setIsPlaying(true);}};handlePlayPauseRef.current=handlePlayPause;const handlePause=()=>{if(isPlaying||subTabs.some(s=>s.isPlaying))stopAllPlayback();};const stopAllPlayback=()=>{activeSourcesRef.current.forEach(src=>{try{src.stop();}catch(e){}});activeSourcesRef.current=[];Object.values(activeTrackNodesRef.current).forEach(n=>{if(n.fxStopFn)n.fxStopFn();});activeTrackNodesRef.current={};if(window.SonicSF){window.SonicSF.stopAll();}setIsPlaying(false);setSubTabs(prev=>prev.map(s=>({...s,isPlaying:false})));};const seekPlaybackTo=time=>{const isSubTab=subTabs.some(sub=>sub.id===activeTab);if(isSubTab){const st=subTabs.find(s=>s.id===activeTab);if(!st)return;if(st.isPlaying){stopAllPlayback();window.SonicSF.stopAll();setSubTabs(prev=>prev.map(s=>s.id===activeTab?{...s,currentTime:time,isPlaying:true}:s));const ctx=getAudioContext();startOffsetTimeRef.current=time;startAudioTimeRef.current=ctx.currentTime;startBufferOffsetRef.current=time*(st.speed||1.0);if(st.type==='PIANO_ROLL'){schedulePianoRollMidi(st,time);}startSubTabPlayback(st,time);}else{setSubTabs(prev=>prev.map(s=>s.id===activeTab?{...s,currentTime:time}:s));}}else{if(isPlaying){stopAllPlayback();setCurrentTime(time);startOffsetTimeRef.current=time;startAudioTimeRef.current=getAudioContext().currentTime;startTrackPlayback(time);setIsPlaying(true);}else{setCurrentTime(time);}}};const handleStop=()=>{if(recordingStateRef.current==='RECORDING'||recordingStateRef.current==='COUNT_IN'){stopRecordingTake();return;}stopAllPlayback();if(activeTab!=='main'&&!activeTab.startsWith('session_')){setSubTabs(prev=>prev.map(s=>s.id===activeTab?{...s,currentTime:0}:s));}else{setCurrentTime(0);}};const drawVuMeter=(canvas,db)=>{if(!canvas)return;const ctx=canvas.getContext('2d');if(!ctx)return;const w=canvas.width;const h=canvas.height;ctx.clearRect(0,0,w,h);const minDb=-60;const maxDb=0;const frac=Math.max(0,Math.min(1,(db-minDb)/(maxDb-minDb)));ctx.fillStyle='#18181b';ctx.fillRect(0,0,w,h);const grad=ctx.createLinearGradient(0,0,w,0);grad.addColorStop(0,'#10b981');grad.addColorStop(0.7,'#eab308');grad.addColorStop(0.95,'#ef4444');ctx.fillStyle=grad;ctx.fillRect(0,0,w*frac,h);if(db>=-0.5){ctx.fillStyle='#ff0000';ctx.fillRect(w-6,0,6,h);}};const handleRecordClick=async()=>{if(recordingState==='RECORDING'||recordingState==='COUNT_IN'){await stopRecordingTake();return;}// Check if piano roll tab is active and armed
 const activePianoRoll=subTabs.find(s=>s.id===activeTab&&s.type==='PIANO_ROLL'&&s.isArmed);if(activePianoRoll&&selectedMidiInputId){setRecordingState('COUNT_IN');const secondsPerBeat=60.0/(parseInt(bpm)||120);const countInDuration=secondsPerBeat*4;const audioCtx=getAudioContext();const now=audioCtx.currentTime;showToast('Metronome Count-in: 4... 3... 2... 1... (MIDI Piano Roll)','info');for(let i=0;i<4;i++){playMetronomeClick(now+i*secondsPerBeat,i===0);}setTimeout(()=>{startPianoRollRecording(activePianoRoll);},countInDuration*1000);return;}const armed=activeTracks.filter(t=>t.isArmed&&t.inputSource?.deviceType&&t.inputSource.deviceType!=='NONE');if(armed.length===0){showToast('Vui lòng Arm (R) ít nhất một track và chọn cổng Input để ghi âm.','warning');return;}setRecordingState('COUNT_IN');const secondsPerBeat=60.0/(parseInt(bpm)||120);const countInDuration=secondsPerBeat*4;const audioCtx=getAudioContext();const now=audioCtx.currentTime;showToast('Metronome Count-in: 4... 3... 2... 1...','info');for(let i=0;i<4;i++){playMetronomeClick(now+i*secondsPerBeat,i===0);}setTimeout(()=>{startRecordingTake(armed);},countInDuration*1000);};const startPianoRollRecording=tab=>{try{const context=getAudioContext();const secondsPerBeat=60.0/(parseInt(bpm)||120);const startTime=currentTime;const startBeat=startTime/secondsPerBeat;nextMetronomeBeatRef.current=Math.ceil(startBeat);const midiRec=new ClientMIDIRecorder(context,parseInt(bpm)||120,4);midiRec.tempTabId=tab.id;midiRec.selectedMidiInputId=selectedMidiInputId||'ALL';midiRec.start(startTime/secondsPerBeat,midiRec.selectedMidiInputId);pianoRollRecorderRef.current=midiRec;activeMIDIRecordersRef.current['piano_roll']=midiRec;setRecStartTimelineTime(startTime);recordingStartTimeRef.current=startTime;setRecordingState('RECORDING');setRecTempMidiNotes([]);const ctx=getAudioContext();const silentBuf=ctx.createBuffer(1,128,ctx.sampleRate);setSubTabs(prev=>prev.map(s=>s.id===tab.id?{...s,buffer:silentBuf,isPlaying:true}:s));startSubTabPlayback({...tab,buffer:silentBuf},startTime);startOffsetTimeRef.current=startTime;startAudioTimeRef.current=context.currentTime;setIsPlaying(true);midiRec.onNoteOn=(pitch,currentBeat)=>{const elapsedBeats=Math.max(0,currentBeat);const sec=elapsedBeats*(60.0/(parseInt(bpm)||120));const activeNotes=Array.from(midiRec.activeNotes.values()).map(n=>({id:'rec_'+n.pitch+'_'+currentBeat,pitch:n.pitch,start_beat:n.start_beat,duration_beats:Math.max(0.125,currentBeat-n.start_beat),velocity:Math.min(1,n.velocity||0.8),pan:0.0}));const rec=midiRec.recordedNotes.map((n,i)=>({id:'rec_'+Date.now()+'_'+i,pitch:n.pitch,start_beat:n.start_beat,duration_beats:n.duration_beats,velocity:Math.min(1,n.velocity||0.8),pan:0.0}));const allNotes=[...rec,...activeNotes];setRecTempMidiNotes(allNotes);setCanvasRedrawCount(n=>n+1);setSubTabs(prev=>prev.map(s=>s.id===tab.id?{...s,currentTime:startTime+sec,isDirty:true}:s));};if(!tab._recordingStarted){tab._recordingStarted=true;}showToast('Recording MIDI to Piano Roll...','info');}catch(err){console.error('startPianoRollRecording error:',err);showToast('Lỗi khi bắt đầu ghi âm Piano Roll: '+err.message,'warning');setRecordingState('IDLE');}};handleRecordClickRef.current=handleRecordClick;const startRecordingTake=async armedTracks=>{const context=getAudioContext();if(context.state==='suspended'){await context.resume();}setRecordingState('RECORDING');setRecTempMidiNotes([]);setRecTempAudioBuffer(null);const startTimelineTime=currentTime;setRecStartTimelineTime(startTimelineTime);recordingStartTimeRef.current=startTimelineTime;const secondsPerBeat=60.0/(parseInt(bpm)||120);const startBeat=startTimelineTime/secondsPerBeat;nextMetronomeBeatRef.current=Math.ceil(startBeat);activeMIDIRecordersRef.current={};activeAudioRecordersRef.current={};recordingPCMDataRef.current={};startOffsetTimeRef.current=startTimelineTime;startAudioTimeRef.current=context.currentTime;startTrackPlayback(startTimelineTime);setIsPlaying(true);let midiRecList=[];for(let track of armedTracks){if(track.inputSource.deviceType==='MIDI_KEYBOARD'){const midiRec=new ClientMIDIRecorder(context,parseInt(bpm)||120,4);const tempMidiItemId='midi_rec_'+Date.now()+'_'+track.id;midiRec.tempMidiItemId=tempMidiItemId;updateActiveTracks(prev=>prev.map(t=>{if(t.id!==track.id)return t;return{...t,midiItems:[...(t.midiItems||[]),{id:tempMidiItemId,name:'Recording...',startTime:startTimelineTime,duration:4*(secondsPerBeat*4),notes:[]}]};}));midiRec.onNoteOn=(pitch,currentBeat)=>{const canvas=trackVuRefs.current[track.id];if(canvas){drawVuMeter(canvas,0);setTimeout(()=>drawVuMeter(canvas,-60),100);}const elapsedBeats=Math.max(0,currentBeat);const elapsedSec=elapsedBeats*secondsPerBeat;const durationSec=Math.max(4*(secondsPerBeat*4),elapsedSec);const allNotes=[...midiRec.recordedNotes,...Array.from(midiRec.activeNotes.values()).map(n=>({...n,duration_beats:currentBeat-n.start_beat}))];setRecTempMidiNotes(allNotes);setCanvasRedrawCount(n=>n+1);if(midiRec.tempMidiItemId){updateActiveTracks(prev=>prev.map(t=>{if(t.id!==track.id)return t;return{...t,midiItems:t.midiItems.map(m=>m.id===midiRec.tempMidiItemId?{...m,notes:allNotes,duration:durationSec}:m)};}));}};midiRec.onNoteOff=()=>{const currentBeat=(context.currentTime-midiRec.recStartAudioTime-midiRec.latencyCompSec)/(60.0/midiRec.bpm);const elapsedBeats=Math.max(0,currentBeat);const elapsedSec=elapsedBeats*secondsPerBeat;const durationSec=Math.max(4*(secondsPerBeat*4),elapsedSec);const activeNotesArray=Array.from(midiRec.activeNotes.values()).map(n=>({...n,duration_beats:currentBeat-n.start_beat}));const allNotes=[...midiRec.recordedNotes,...activeNotesArray];setRecTempMidiNotes(allNotes);setCanvasRedrawCount(n=>n+1);if(midiRec.tempMidiItemId){updateActiveTracks(prev=>prev.map(t=>{if(t.id!==track.id)return t;return{...t,midiItems:t.midiItems.map(m=>m.id===midiRec.tempMidiItemId?{...m,notes:allNotes,duration:durationSec}:m)};}));}};midiRec.start(startTimelineTime/(secondsPerBeat*4),track.inputSource.deviceId);activeMIDIRecordersRef.current[track.id]=midiRec;midiRecList.push({trackId:track.id,midiRec});}else if(track.inputSource.deviceType==='MICROPHONE'){const audioRec=new ClientAudioRecorder(context);try{await audioRec.initializeInput(track.inputSource.deviceId);recordingPCMDataRef.current[track.id]=[];audioRec.onLevelUpdate=db=>{const canvas=trackVuRefs.current[track.id];if(canvas){drawVuMeter(canvas,db);}};audioRec.onPCMChunk=chunk=>{if(recordingPCMDataRef.current[track.id]){const currentData=recordingPCMDataRef.current[track.id];const newData=new Float32Array(currentData.length+chunk.length);newData.set(currentData);newData.set(chunk,currentData.length);recordingPCMDataRef.current[track.id]=newData;}};const monitorGain=track.monitoringEnabled?context.destination:null;await audioRec.start(monitorGain,track.monitoringEnabled);activeAudioRecordersRef.current[track.id]=audioRec;}catch(err){console.error('Failed to initialize microphone:',err);showToast('Không khởi động được micro: '+err.message,'warning');}}}recordingSyncRef.current=setInterval(()=>{const secondsPerBeatInt=60.0/(parseInt(bpm)||120);for(let{trackId,midiRec}of midiRecList){if(!midiRec.isRecording||!midiRec.tempMidiItemId)continue;const currentTimeSec=Math.max(0,getAudioContext().currentTime-midiRec.recStartAudioTime-midiRec.latencyCompSec);const currentBeat=currentTimeSec/secondsPerBeatInt;const allNotes=[...midiRec.recordedNotes,...Array.from(midiRec.activeNotes.values()).map(n=>({...n,duration_beats:currentBeat-n.start_beat}))];const durationSec=Math.max(4*(secondsPerBeatInt*4),currentTimeSec);if(Math.random()<0.2){// Throttle log to prevent flooding (approx 2 logs/sec)
 console.log(`[DevLog] [MIDI Rec Sync] Temp Item ID: ${midiRec.tempMidiItemId}, Duration: ${durationSec.toFixed(2)}s, ActiveNotes: ${midiRec.activeNotes.size}, RecordedNotes: ${midiRec.recordedNotes.length}`);}setRecTempMidiNotes(allNotes);setCanvasRedrawCount(n=>n+1);updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;return{...t,midiItems:t.midiItems.map(m=>m.id===midiRec.tempMidiItemId?{...m,notes:allNotes,duration:durationSec}:m)};}));}},100);showToast('Đang ghi âm...','info');};const stopRecordingTake=async()=>{setRecordingState('IDLE');stopAllPlayback();const context=getAudioContext();const secondsPerBeat=60.0/(parseInt(bpm)||120);const secondsPerBar=secondsPerBeat*4;const midiRecorders=activeMIDIRecordersRef.current;const audioRecorders=activeAudioRecordersRef.current;Object.keys(trackVuRefs.current).forEach(tid=>{const canvas=trackVuRefs.current[tid];if(canvas)drawVuMeter(canvas,-60);});let hasRecordedAnything=false;for(let trackId in midiRecorders){const midiRec=midiRecorders[trackId];if(midiRec.tempTabId){const recordedNotes=midiRec.stop();if(recordedNotes.length>0){const newNotes=recordedNotes.map((n,i)=>({id:'rec_'+Date.now()+'_'+i,pitch:n.pitch,start_beat:Math.max(0,n.start_beat||0),duration_beats:Math.max(0.125,n.duration_beats||0.25),velocity:Math.min(1,n.velocity||0.8),pan:0.0}));setSubTabs(prev=>prev.map(s=>s.id===midiRec.tempTabId?{...s,notes:[...(s.notes||[]),...newNotes],isDirty:true}:s));setCanvasRedrawCount(n=>n+1);showToast(`Đã ghi ${recordedNotes.length} notes vào Piano Roll.`,'success');}hasRecordedAnything=true;}else if(midiRec.tempMidiItemId){const recCurrentTimeSec=Math.max(0,context.currentTime-midiRec.recStartAudioTime-midiRec.latencyCompSec);const recElapsedBeats=recCurrentTimeSec/(60.0/midiRec.bpm);const totalDurationBeats=Math.max(4.0,recordedNotes.length>0?Math.max(recElapsedBeats,...recordedNotes.map(n=>n.start_beat+n.duration_beats)):recElapsedBeats);updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;const itemIndex=(t.midiItems||[]).findIndex(m=>m.id===midiRec.tempMidiItemId);if(itemIndex>=0){const updatedItems=[...t.midiItems];updatedItems[itemIndex]={...updatedItems[itemIndex],name:recordedNotes.length>0?'Recorded MIDI':'Empty MIDI',notes:recordedNotes,duration:Math.ceil(totalDurationBeats/4)*secondsPerBar};return{...t,midiItems:updatedItems};}const newMidiItem={id:'midi_rec_'+Date.now(),name:'Recorded MIDI',parent_track_id:t.id,startTime:recordingStartTimeRef.current,duration:Math.ceil(totalDurationBeats/4)*secondsPerBar,length_bars:Math.ceil(totalDurationBeats/4),notes:recordedNotes};return{...t,midiItems:[...(t.midiItems||[]),newMidiItem]};}));if(recordedNotes.length>0){hasRecordedAnything=true;}}else if(recordedNotes.length>0){hasRecordedAnything=true;const totalDurationBeats=Math.max(4.0,...recordedNotes.map(n=>n.start_beat+n.duration_beats));const newMidiItem={id:'midi_rec_'+Date.now(),name:'Recorded MIDI',parent_track_id:trackId,startTime:recordingStartTimeRef.current,duration:Math.ceil(totalDurationBeats/4)*secondsPerBar,length_bars:Math.ceil(totalDurationBeats/4),notes:recordedNotes};updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;return{...t,midiItems:[...(t.midiItems||[]),newMidiItem]};}));}}for(let trackId in audioRecorders){const audioRec=audioRecorders[trackId];const audioBuffer=await audioRec.stop();if(audioBuffer&&audioBuffer.duration>0.05){hasRecordedAnything=true;const newClip={id:'clip_rec_'+Date.now(),name:'Recorded Audio.wav',buffer:audioBuffer,startTime:recordingStartTimeRef.current,speed:1.0};updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId)return t;const updatedClips=[...(t.clips||[]),newClip];return{...t,clips:updatedClips,buffer:updatedClips[0]?.buffer||null,startTime:updatedClips[0]?.startTime||0,name:updatedClips[0]?.name||t.name};}));}}if(recordingSyncRef.current){clearInterval(recordingSyncRef.current);recordingSyncRef.current=null;}activeMIDIRecordersRef.current={};activeAudioRecordersRef.current={};recordingPCMDataRef.current={};setRecTempMidiNotes([]);setRecTempAudioBuffer(null);if(hasRecordedAnything){showToast('Đã thu và lưu bản ghi vào timeline.','success');}else{showToast('Đã dừng ghi âm (không phát hiện tín hiệu đầu vào).','info');}};const handleSubTabResizeMouseDown=e=>{e.preventDefault();e.stopPropagation();const startY=e.clientY;const startHeight=subTabHeight;const handleMouseMove=moveEvent=>{const deltaY=moveEvent.clientY-startY;const newHeight=Math.max(48,Math.min(400,startHeight+deltaY));setSubTabHeight(newHeight);};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};// ── Playhead set with seek+play ──
-const handlePlayheadSet=(time,shiftKey)=>{localSelectionAnchorRef.current=time;if(isPlaying){// Click during playback: seek to position and continue playing
-setCurrentTime(time);stopAllPlayback();setTimeout(()=>{startOffsetTimeRef.current=time;startAudioTimeRef.current=getAudioContext().currentTime;startTrackPlayback(time);setIsPlaying(true);},50);}else{// Normal click: just set playhead
-setCurrentTime(time);}};const clearLocalSelection=()=>{setSelectionMode(null);setLocalSelectionTrackId(null);setLocalSelectionStart(null);setLocalSelectionEnd(null);};const handleRulerMouseDown=e=>{if(e.ctrlKey){e.preventDefault();e.stopPropagation();clearLocalSelection();const wrapper=timelineWrapperRef.current;if(wrapper){const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const rawTime=Math.max(0,(e.clientX-rect.left+scrollLeft)/zoom-leadInMargin);const time=snapValue!=='free'?snapTime(rawTime,snapValue,bpm):rawTime;rulerDragStartRef.current=time;rulerAnchorRef.current=time;isDraggingRulerRef.current=true;setSelectionMode('global');setSelectionStart(time);setSelectionEnd(time);}return;}const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const rawTime=Math.max(0,mouseX/zoom-leadInMargin);const time=snapValue!=='free'?snapTime(rawTime,snapValue,bpm):rawTime;clearLocalSelection();setSelectionMode('global');rulerDragStartRef.current=time;isDraggingRulerRef.current=true;if(e.shiftKey){e.preventDefault();e.stopPropagation();// Shift+click on ruler: lock existing anchor (or currentTime fallback) and extend global selection
-const anchor=rulerAnchorRef.current!==null&&rulerAnchorRef.current!==undefined?rulerAnchorRef.current:selectionStart!==null&&selectionStart!==undefined?selectionStart:currentTime;const selS=Math.max(0,Math.min(anchor,time));const selE=Math.max(0,Math.max(anchor,time));setSelectionStart(selS);setSelectionEnd(selE);}else{rulerAnchorRef.current=Math.max(0,time);}handlePlayheadSet(time);};// Global Ruler mousemove is tracked via document listener set up in useEffect
-useEffect(()=>{const handleMouseMove=e=>{if(!isDraggingRulerRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const rawTime=Math.max(0,Math.min(maxDuration,mouseX/zoom-leadInMarginRef.current));const time=snapValueRef.current!=='free'?snapTime(rawTime,snapValueRef.current,bpmRef.current):rawTime;const anchor=rulerAnchorRef.current??rulerDragStartRef.current??time;setSelectionStart(Math.min(anchor,time));setSelectionEnd(Math.max(anchor,time));};const handleMouseUp=()=>{if(isDraggingRulerRef.current){isDraggingRulerRef.current=false;rulerDragStartRef.current=null;}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);// Sub-tab ruler drag (section/editor tabs)
+const handlePlayheadSet=(time,shiftKey)=>{setPlayheadWithUndo(time);};const clearLocalSelection=()=>{setSelectionMode(null);setLocalSelectionTrackId(null);setLocalSelectionStart(null);setLocalSelectionEnd(null);};const handleRulerMouseDown=e=>{if(e.ctrlKey){e.preventDefault();e.stopPropagation();clearLocalSelection();const wrapper=timelineWrapperRef.current;if(wrapper){const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const rawTime=Math.max(0,(e.clientX-rect.left+scrollLeft)/zoom-leadInMargin);const time=snapValue!=='free'?snapTime(rawTime,snapValue,bpm):rawTime;rulerDragStartRef.current=time;rulerAnchorRef.current=time;isDraggingRulerRef.current=true;captureSelectionUndo();setSelectionMode('global');setSelectionStart(time);setSelectionEnd(time);}return;}const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const rawTime=Math.max(0,mouseX/zoom-leadInMargin);const time=snapValue!=='free'?snapTime(rawTime,snapValue,bpm):rawTime;clearLocalSelection();captureSelectionUndo();setSelectionMode('global');rulerDragStartRef.current=time;isDraggingRulerRef.current=true;if(e.shiftKey){e.preventDefault();e.stopPropagation();const anchor=rulerAnchorRef.current!==null&&rulerAnchorRef.current!==undefined?rulerAnchorRef.current:selectionStart!==null&&selectionStart!==undefined?selectionStart:currentTime;const selS=Math.max(0,Math.min(anchor,time));const selE=Math.max(0,Math.max(anchor,time));setSelectionStart(selS);setSelectionEnd(selE);}else{rulerAnchorRef.current=Math.max(0,time);}handlePlayheadSet(time);};// Global Ruler mousemove is tracked via document listener set up in useEffect
+useEffect(()=>{const handleMouseMove=e=>{if(!isDraggingRulerRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const rawTime=Math.max(0,Math.min(maxDuration,mouseX/zoom-leadInMarginRef.current));const time=snapValueRef.current!=='free'?snapTime(rawTime,snapValueRef.current,bpmRef.current):rawTime;const anchor=rulerAnchorRef.current??rulerDragStartRef.current??time;setSelectionStart(Math.min(anchor,time));setSelectionEnd(Math.max(anchor,time));};const handleMouseUp=()=>{if(isDraggingRulerRef.current){isDraggingRulerRef.current=false;rulerDragStartRef.current=null;pushSelectionUndo();}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);// Sub-tab ruler drag (section/editor tabs)
 const handleSubTabMove=e=>{if(!isDraggingSubTabRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const sl=wrapper.scrollLeft;const raw=Math.max(0,(e.clientX-rect.left+sl)/zoom);const time=snapValueRef.current!=='free'?snapTime(raw,snapValueRef.current,bpmRef.current):raw;const anchor=subTabDragStartRef.current??0;setSubTabs(prev=>prev.map(s=>s.id===activeTabRef.current?{...s,selectionStart:Math.min(anchor,time),selectionEnd:Math.max(anchor,time)}:s));};const handleSubTabUp=()=>{if(isDraggingSubTabRef.current){isDraggingSubTabRef.current=false;subTabDragStartRef.current=null;}};document.addEventListener('mousemove',handleSubTabMove);document.addEventListener('mouseup',handleSubTabUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);document.removeEventListener('mousemove',handleSubTabMove);document.removeEventListener('mouseup',handleSubTabUp);};},[zoom,maxDuration]);// ── Track Lane Local Selection Drag ──
-const localDragInProgressRef=useRef(false);const localDragTrackRef=useRef(null);const localDragStartTimeRef=useRef(0);const localSelectionAnchorRef=useRef(null);const handleTrackLaneMouseDown=(trackId,time)=>{setSelectedTrackId(trackId);clearLocalSelection();localSelectionAnchorRef.current=time;setSelectionMode('local');setLocalSelectionTrackId(trackId);setLocalSelectionStart(time);setLocalSelectionEnd(time);setSelectionStart(time);setSelectionEnd(time);localDragInProgressRef.current=true;localDragTrackRef.current=trackId;localDragStartTimeRef.current=time;};// Document-level mousemove/mouseup for local selection drag
-useEffect(()=>{const handleMouseMove=e=>{if(!localDragInProgressRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,Math.min(maxDuration,mouseX/zoom));const anchor=localSelectionAnchorRef.current??localDragStartTimeRef.current;const selS=Math.min(anchor,time);const selE=Math.max(anchor,time);setLocalSelectionStart(selS);setLocalSelectionEnd(selE);setSelectionStart(selS);setSelectionEnd(selE);};const handleMouseUp=()=>{if(localDragInProgressRef.current){localDragInProgressRef.current=false;localDragTrackRef.current=null;localDragStartTimeRef.current=0;}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,maxDuration]);const draggedClipRef=useRef(null);draggedClipRef.current=draggedClip;const hoveredTrackIdRef=useRef(null);hoveredTrackIdRef.current=hoveredTrackId;const captureTrackSnapshotRef=useRef(null);captureTrackSnapshotRef.current=captureTrackSnapshot;const draggedSectionItemRef=useRef(null);draggedSectionItemRef.current=draggedSectionItem;const resizedSectionItemRef=useRef(null);resizedSectionItemRef.current=resizedSectionItem;let clipSeqCounter=0;const nextClipId=()=>`clip_${Date.now()}_${++clipSeqCounter}`;const handleClipDragStart=(trackId,clipId,clickOffset,isDuplicate=false)=>{const curTracks=activeTracksRef.current||activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const existingClips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default_'+track.id,buffer:track.buffer,startTime:track.startTime||0,name:track.name}]:[];const clip=existingClips.find(c=>c.id===clipId||clipId==='default'&&c.id==='default_'+track.id);if(!clip)return;const beforeSnap=captureTrackSnapshot(trackId);if(isDuplicate){const cloneId=nextClipId();const clone={...clip,id:cloneId,startTime:clip.startTime||0,name:clip.name+' (Copy)'};updateActiveTracks(prev=>prev.map(t=>{if(t.id===trackId){const newClips=[...existingClips,clone];return{...t,clips:newClips,buffer:newClips[0].buffer,startTime:newClips[0].startTime,name:newClips[0].name};}return t;}));setDraggedClip({trackId,clipId:cloneId,clickOffset,buffer:clip.buffer,name:clip.name+' (Copy)',beforeSnap,isDuplicate:false});return;}if(!track.clips||track.clips.length===0){updateActiveTracks(prev=>prev.map(t=>{if(t.id===trackId){return{...t,clips:existingClips};}return t;}));}setDraggedClip({trackId,clipId:clip.id,clickOffset,buffer:clip.buffer,name:clip.name,beforeSnap,isDuplicate:false});};const stretchedClipRef=useRef(null);stretchedClipRef.current=stretchedClip;const handleClipStretchStart=(trackId,clipId,clickTime)=>{const curTracks=activeTracksRef.current||activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const clips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default_'+track.id,buffer:track.buffer,startTime:track.startTime||0,name:track.name,speed:track.speed||1.0}]:[];const clip=clips.find(c=>c.id===clipId||clipId==='default'&&c.id==='default_'+trackId);if(!clip||!clip.buffer)return;const beforeSnap=captureTrackSnapshot(trackId);if(!track.clips||track.clips.length===0){updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,clips}:t));}setStretchedClip({trackId,clipId:clip.id==='default'?'default_'+trackId:clip.id,originalDuration:clip.buffer.duration,startTime:clip.startTime,originalSpeed:clip.speed||1.0,beforeSnap});};const handleSelectionEdgeDragStart=(e,trackId,side)=>{const startX=e.clientX;const initialLeft=Math.min(localSelectionStart,localSelectionEnd);const initialRight=Math.max(localSelectionStart,localSelectionEnd);const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;if(side==='left'){const newLeft=Math.max(0,Math.min(initialRight-0.05,initialLeft+deltaSec));setLocalSelectionStart(newLeft);setLocalSelectionEnd(initialRight);}else{const newRight=Math.max(initialLeft+0.05,Math.min(maxDuration,initialRight+deltaSec));setLocalSelectionStart(initialLeft);setLocalSelectionEnd(newRight);}};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const handleTrackResizeMouseDown=(e,trackId)=>{e.preventDefault();e.stopPropagation();const startY=e.clientY;const track=tracks.find(t=>t.id===trackId);const startHeight=track?track.height||140:140;const handleMouseMove=moveEvent=>{const deltaY=moveEvent.clientY-startY;const newHeight=Math.max(110,Math.min(300,startHeight+deltaY));setTracks(prev=>prev.map(t=>t.id===trackId?{...t,height:newHeight}:t));};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const deleteTrack=trackId=>{const sessionTab=sessionTabs.find(s=>s.id===activeTab);const trackList=sessionTab?sessionTab.tracks:tracks;const track=trackList.find(t=>t.id===trackId);if(!track)return;const hasClips=track.clips&&track.clips.length>0||!!track.buffer;const hasMidi=track.midiItems&&track.midiItems.length>0;const hasSections=track.sections&&track.sections.length>0;const isTrackEmpty=!hasClips&&!hasMidi&&!hasSections;if(!isTrackEmpty){showToast('Không thể xoá track chứa dữ liệu. Vui lòng xoá hết các item trước khi xoá track.','warning');return;}if(sessionTab){updateActiveTracks(prev=>{const filtered=prev.filter(t=>t.id!==trackId);if(filtered.length>0)setSelectedTrackId(filtered[0].id);return filtered;});}else{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>{const filtered=prev.filter(t=>t.id!==trackId);if(filtered.length>0)setSelectedTrackId(filtered[0].id);return filtered;});}showToast('Đã xóa track.','info');};// Shared auto-scroll: when mouse near right edge, scroll container right
+const localDragInProgressRef=useRef(false);const localDragTrackRef=useRef(null);const localDragStartTimeRef=useRef(0);const localSelectionAnchorRef=useRef(null);const handleTrackLaneMouseDown=(trackId,time)=>{setSelectedTrackId(trackId);captureSelectionUndo();clearLocalSelection();localSelectionAnchorRef.current=time;setSelectionMode('local');setLocalSelectionTrackId(trackId);setLocalSelectionStart(time);setLocalSelectionEnd(time);setSelectionStart(time);setSelectionEnd(time);localDragInProgressRef.current=true;localDragTrackRef.current=trackId;localDragStartTimeRef.current=time;};// Document-level mousemove/mouseup for local selection drag
+useEffect(()=>{const handleMouseMove=e=>{if(!localDragInProgressRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,Math.min(maxDuration,mouseX/zoom));const anchor=localSelectionAnchorRef.current??localDragStartTimeRef.current;const selS=Math.min(anchor,time);const selE=Math.max(anchor,time);setLocalSelectionStart(selS);setLocalSelectionEnd(selE);setSelectionStart(selS);setSelectionEnd(selE);};const handleMouseUp=()=>{if(localDragInProgressRef.current){localDragInProgressRef.current=false;localDragTrackRef.current=null;localDragStartTimeRef.current=0;pushSelectionUndo();}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,maxDuration]);const draggedClipRef=useRef(null);draggedClipRef.current=draggedClip;const hoveredTrackIdRef=useRef(null);hoveredTrackIdRef.current=hoveredTrackId;const captureTrackSnapshotRef=useRef(null);captureTrackSnapshotRef.current=captureTrackSnapshot;const draggedSectionItemRef=useRef(null);draggedSectionItemRef.current=draggedSectionItem;const resizedSectionItemRef=useRef(null);resizedSectionItemRef.current=resizedSectionItem;const selectionUndoRef=useRef(null);const pushSelectionUndo=()=>{var cur=selectionRef.current;var before=selectionUndoRef.current;if(!before||before.start===cur.start&&before.end===cur.end&&before.mode===cur.mode)return;var entry={type:'SELECTION',scope:'global',label:'Selection',before:before,after:{start:cur.start,end:cur.end,mode:cur.mode},undo:e=>{setSelectionStart(e.before.start);setSelectionEnd(e.before.end);setSelectionMode(e.before.mode);showToast('Undo: Selection','info');},redo:e=>{setSelectionStart(e.after.start);setSelectionEnd(e.after.end);setSelectionMode(e.after.mode);showToast('Redo: Selection','info');}};if(window.UndoRedoEngine)window.UndoRedoEngine.execute(entry);selectionUndoRef.current=null;};const captureSelectionUndo=()=>{if(selectionUndoRef.current!==null)return;selectionUndoRef.current={start:selectionRef.current.start,end:selectionRef.current.end,mode:selectionMode};};let clipSeqCounter=0;const nextClipId=()=>`clip_${Date.now()}_${++clipSeqCounter}`;const handleClipDragStart=(trackId,clipId,clickOffset,isDuplicate=false)=>{const curTracks=activeTracksRef.current||activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const existingClips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default_'+track.id,buffer:track.buffer,startTime:track.startTime||0,name:track.name}]:[];const clip=existingClips.find(c=>c.id===clipId||clipId==='default'&&c.id==='default_'+track.id);if(!clip)return;const beforeSnap=captureTrackSnapshot(trackId);if(isDuplicate){const cloneId=nextClipId();const clone={...clip,id:cloneId,startTime:clip.startTime||0,name:clip.name+' (Copy)'};updateActiveTracks(prev=>prev.map(t=>{if(t.id===trackId){const newClips=[...existingClips,clone];return{...t,clips:newClips,buffer:newClips[0].buffer,startTime:newClips[0].startTime,name:newClips[0].name};}return t;}));setDraggedClip({trackId,clipId:cloneId,clickOffset,buffer:clip.buffer,name:clip.name+' (Copy)',beforeSnap,isDuplicate:false});return;}if(!track.clips||track.clips.length===0){updateActiveTracks(prev=>prev.map(t=>{if(t.id===trackId){return{...t,clips:existingClips};}return t;}));}setDraggedClip({trackId,clipId:clip.id,clickOffset,buffer:clip.buffer,name:clip.name,beforeSnap,isDuplicate:false});};const stretchedClipRef=useRef(null);stretchedClipRef.current=stretchedClip;const handleClipStretchStart=(trackId,clipId,clickTime)=>{const curTracks=activeTracksRef.current||activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const clips=track.clips&&track.clips.length>0?track.clips:track.buffer?[{id:'default_'+track.id,buffer:track.buffer,startTime:track.startTime||0,name:track.name,speed:track.speed||1.0}]:[];const clip=clips.find(c=>c.id===clipId||clipId==='default'&&c.id==='default_'+trackId);if(!clip||!clip.buffer)return;const beforeSnap=captureTrackSnapshot(trackId);if(!track.clips||track.clips.length===0){updateActiveTracks(prev=>prev.map(t=>t.id===trackId?{...t,clips}:t));}setStretchedClip({trackId,clipId:clip.id==='default'?'default_'+trackId:clip.id,originalDuration:clip.buffer.duration,startTime:clip.startTime,originalSpeed:clip.speed||1.0,beforeSnap});};const handleSelectionEdgeDragStart=(e,trackId,side)=>{const startX=e.clientX;const initialLeft=Math.min(localSelectionStart,localSelectionEnd);const initialRight=Math.max(localSelectionStart,localSelectionEnd);const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;if(side==='left'){const newLeft=Math.max(0,Math.min(initialRight-0.05,initialLeft+deltaSec));setLocalSelectionStart(newLeft);setLocalSelectionEnd(initialRight);}else{const newRight=Math.max(initialLeft+0.05,Math.min(maxDuration,initialRight+deltaSec));setLocalSelectionStart(initialLeft);setLocalSelectionEnd(newRight);}};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const handleTrackResizeMouseDown=(e,trackId)=>{e.preventDefault();e.stopPropagation();const startY=e.clientY;const track=tracks.find(t=>t.id===trackId);const startHeight=track?track.height||140:140;const handleMouseMove=moveEvent=>{const deltaY=moveEvent.clientY-startY;const newHeight=Math.max(110,Math.min(300,startHeight+deltaY));setTracks(prev=>prev.map(t=>t.id===trackId?{...t,height:newHeight}:t));};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const deleteTrack=trackId=>{const sessionTab=sessionTabs.find(s=>s.id===activeTab);const trackList=sessionTab?sessionTab.tracks:tracks;const track=trackList.find(t=>t.id===trackId);if(!track)return;const hasClips=track.clips&&track.clips.length>0||!!track.buffer;const hasMidi=track.midiItems&&track.midiItems.length>0;const hasSections=track.sections&&track.sections.length>0;const isTrackEmpty=!hasClips&&!hasMidi&&!hasSections;if(!isTrackEmpty){showToast('Không thể xoá track chứa dữ liệu. Vui lòng xoá hết các item trước khi xoá track.','warning');return;}if(sessionTab){updateActiveTracks(prev=>{const filtered=prev.filter(t=>t.id!==trackId);if(filtered.length>0)setSelectedTrackId(filtered[0].id);return filtered;});}else{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>{const filtered=prev.filter(t=>t.id!==trackId);if(filtered.length>0)setSelectedTrackId(filtered[0].id);return filtered;});}showToast('Đã xóa track.','info');};// Shared auto-scroll: when mouse near right edge, scroll container right
 const autoScrollTimeline=clientX=>{const wrapper=timelineWrapperRef.current;if(!wrapper)return;const wr=wrapper.getBoundingClientRect();const margin=200;if(clientX>wr.right-margin){const depth=(clientX-(wr.right-margin))/margin;const speed=Math.round(5+depth*depth*40);wrapper.scrollLeft+=speed;if(wrapper.scrollLeft>wrapper.scrollWidth-wrapper.clientWidth-100){const secPerBar=60.0/(parseInt(bpm)||120)*4;setScrollBufferExtra(prev=>prev+secPerBar*4);}}else if(clientX<wr.left+margin){const depth=(wr.left+margin-clientX)/margin;const speed=Math.round(5+depth*depth*40);wrapper.scrollLeft=Math.max(0,wrapper.scrollLeft-speed);}};useEffect(()=>{const handleMouseMove=e=>{const drag=draggedClipRef.current;if(!drag)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);const beatSec=60.0/(parseInt(bpmRef.current)||120);const rawStart=Math.max(0,time-drag.clickOffset);const secPerBar=beatSec*4;const marginBar=maxDurationRef.current-secPerBar;const clampedStart=Math.min(rawStart,marginBar);const newStart=snapTime(Math.max(0,clampedStart),snapValueRef.current,bpmRef.current);const itemPx=newStart*zoom;const keepMargin=80;if(itemPx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=itemPx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(itemPx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,itemPx-keepMargin);setCanvasRedrawCount(n=>n+1);}const targetTrackId=hoveredTrackIdRef.current||drag.trackId;updateActiveTracks(prev=>prev.map(t=>{// Clear the clip from its previous track if it moved to a new track
 if(t.id===drag.trackId&&drag.trackId!==targetTrackId){const updatedClips=(t.clips||[]).filter(c=>c.id!==drag.clipId);return{...t,clips:updatedClips,buffer:updatedClips.length>0?updatedClips[0].buffer:null,startTime:updatedClips.length>0?updatedClips[0].startTime:0,name:updatedClips.length>0?updatedClips[0].name:`Track ${t.id}`};}// Update/set clip on target track
 if(t.id===targetTrackId){const existingClips=t.clips&&t.clips.length>0?t.clips:t.buffer?[{id:'default_'+t.id,buffer:t.buffer,startTime:t.startTime||0,name:t.name}]:[];const hasClip=existingClips.some(c=>c.id===drag.clipId);let updatedClips;if(hasClip){updatedClips=existingClips.map(c=>c.id===drag.clipId?{...c,startTime:newStart}:c);}else{updatedClips=[...existingClips,{id:drag.clipId,buffer:drag.buffer,startTime:newStart,name:drag.name}];}return{...t,clips:updatedClips,buffer:updatedClips[0].buffer,startTime:updatedClips[0].startTime,name:updatedClips[0].name};}return t;}));if(drag.trackId!==targetTrackId){setDraggedClip(prev=>({...prev,trackId:targetTrackId}));}};const handleMouseUp=()=>{const drag=draggedClipRef.current;if(!drag)return;const afterSnap=captureTrackSnapshotRef.current(drag.trackId);pushAction('MOVE_CLIP',drag.trackId,drag.beforeSnap,afterSnap);setDraggedClip(null);showToast('Đã di chuyển clip.','success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);// Document-level mousemove/mouseup for clip stretching
 useEffect(()=>{const handleMouseMove=e=>{const stretch=stretchedClipRef.current;if(!stretch)return;autoScrollTimeline(e.clientX);const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=mouseX/zoom;const secPerBar=60.0/(parseInt(bpmRef.current)||120)*4;const marginBar=maxDurationRef.current-secPerBar;const maxEnd=Math.min(time,marginBar);const newDuration=Math.max(0.1,maxEnd-stretch.startTime);const speedRatio=stretch.originalDuration/newDuration;updateActiveTracks(prev=>prev.map(t=>{if(t.id===stretch.trackId){const updatedClips=(t.clips||[]).map(c=>{if(c.id===stretch.clipId){return{...c,speed:speedRatio};}return c;});return{...t,clips:updatedClips,buffer:updatedClips[0]?.buffer,startTime:updatedClips[0]?.startTime||0,speed:updatedClips[0]?.speed||1.0};}return t;}));};const handleMouseUp=()=>{const stretch=stretchedClipRef.current;if(!stretch)return;const afterSnap=captureTrackSnapshotRef.current(stretch.trackId);pushAction('STRETCH_CLIP',stretch.trackId,stretch.beforeSnap,afterSnap);setStretchedClip(null);showToast('Đã giãn thời gian clip.','success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);// ── Deselect single item ──
-const handleDeselectItem=itemId=>{setSelectedItemIds(prev=>{var next=new Set(prev);next.delete(itemId);return next;});};// ── Add item to selectedItemIds ──
-const handleSaveSectionTabRef=useRef(handleSaveSectionTab);handleSaveSectionTabRef.current=handleSaveSectionTab;const handleAddToSelection=itemId=>{setSelectedItemIds(prev=>{var next=new Set(prev);next.add(itemId);return next;});};const handleSetPendingDrag=(trackId,itemType,itemId,clickOffset,e,preToggleSnapshot)=>{// Compute selectedIds AFTER the toggle that just happened:
+const handleDeselectItem=itemId=>{captureSelectionUndo();setSelectedItemIds(prev=>{var next=new Set(prev);next.delete(itemId);return next;});};// ── Add item to selectedItemIds ──
+const handleSaveSectionTabRef=useRef(handleSaveSectionTab);handleSaveSectionTabRef.current=handleSaveSectionTab;const handleAddToSelection=itemId=>{captureSelectionUndo();setSelectedItemIds(prev=>{var next=new Set(prev);next.add(itemId);return next;});};const handleSetPendingDrag=(trackId,itemType,itemId,clickOffset,e,preToggleSnapshot)=>{// Compute selectedIds AFTER the toggle that just happened:
 // - If itemId was in snapshot (was selected) → toggle removed it → delete
 // - If itemId was not in snapshot (was not selected) → toggle added it → add
 var ids=preToggleSnapshot?new Set(preToggleSnapshot):new Set(selectedItemIds);if(preToggleSnapshot&&preToggleSnapshot.has(itemId)){ids.delete(itemId);}else{ids.add(itemId);}pendingDragRef.current={trackId,itemType,itemId,clickOffset,startX:e.clientX,startY:e.clientY,selectedIds:ids};};// ── Sweep Select ──
 const handleSweepSelectStart=(trackId,startTime,startY)=>{isSweepingRef.current=true;sweepStartRef.current=startTime;sweepTrackIdRef.current=trackId;sweepStartYRef.current=startY||0;sweepEndYRef.current=startY||0;var init={startTime,endTime:startTime};sweepSelectRef.current=init;setSweepSelect(init);// Do NOT clear selection here – wait until mouseup.
 // Small movement → deselect all; large movement → marquee toggle.
 };// ── Section / MIDI Item Drag Start ──
-const handleSectionItemDragStart=(trackId,itemType,itemId,clickOffset,isDuplicate,pendingSelectedIds)=>{var curTracks=activeTracksRef.current||activeTracks;var multiIds=null;var selIds=pendingSelectedIds||selectedItemIds;if(selIds&&selIds.size>0&&selIds.has(itemId)){var selArr=Array.from(selIds);var originals={};curTracks.forEach(function(t){(t.sections||[]).forEach(function(s){if(selArr.indexOf(s.id)>=0)originals[s.id]={type:'section',start:s.start,trackId:t.id};});(t.midiItems||[]).forEach(function(m){if(selArr.indexOf(m.id)>=0)originals[m.id]={type:'midiItem',start:m.startTime,trackId:t.id};});(t.clips||[]).forEach(function(c){var cid=c.id==='default'?'default_'+t.id:c.id;if(selArr.indexOf(cid)>=0)originals[cid]={type:'clip',start:c.startTime,trackId:t.id};});});if(Object.keys(originals).length>0)multiIds=originals;}if(isDuplicate){var track=curTracks.find(function(t){return t.id===trackId;});if(!track)return;if(multiIds){var newOriginals={};updateActiveTracks(function(prev){return prev.map(function(t){var updatedSections=t.sections?t.sections.slice():[];var updatedMidi=t.midiItems?t.midiItems.slice():[];var updatedClips=t.clips?t.clips.slice():[];Object.keys(multiIds).forEach(function(oid){var info=multiIds[oid];if(info.type==='section'){var sec=(t.sections||[]).find(function(s){return s.id===oid;});if(sec){var rearrangeNewId='sec_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedSections.push({...sec,id:rearrangeNewId,name:sec.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'section',start:sec.start};}}else if(info.type==='midiItem'){var mid=(t.midiItems||[]).find(function(m){return m.id===oid;});if(mid){var rearrangeNewId='midi_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedMidi.push({...mid,id:rearrangeNewId,name:mid.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'midiItem',start:mid.startTime};}}else if(info.type==='clip'){var clip=(t.clips||[]).find(function(c){return c.id===oid||'default_'+t.id===oid;});if(clip){var rearrangeNewId='clip_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedClips.push({...clip,id:rearrangeNewId,startTime:clip.startTime,name:clip.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'clip',start:clip.startTime};}}});return{...t,sections:updatedSections,midiItems:updatedMidi,clips:updatedClips};});});var newItemId=Object.keys(newOriginals)[0]||itemId;setDraggedSectionItem({trackId,itemType,itemId:newItemId,clickOffset,multiIds:newOriginals});}else{var items=itemType==='section'?track.sections||[]:track.midiItems||[];var item=items.find(function(it){return it.id===itemId;});if(!item)return;var rearrangeNewId=itemType+'_dup_'+Date.now();var newItem={...item,id:rearrangeNewId,name:item.name+' (Copy)'};updateActiveTracks(function(prev){return prev.map(function(t){if(t.id!==trackId)return t;var updated=itemType==='section'?[...(t.sections||[]),newItem]:[...(t.midiItems||[]),newItem];return itemType==='section'?{...t,sections:updated}:{...t,midiItems:updated};});});setDraggedSectionItem({trackId,itemType,itemId:rearrangeNewId,clickOffset,isDuplicate:false});}return;}setDraggedSectionItem({trackId,itemType,itemId,clickOffset,multiIds});};handleSectionItemDragStartRef.current=handleSectionItemDragStart;// ── Section / MIDI Item Resize Start ──
+const handleSectionItemDragStart=(trackId,itemType,itemId,clickOffset,isDuplicate,pendingSelectedIds)=>{var curTracks=activeTracksRef.current||activeTracks;var multiIds=null;var selIds=pendingSelectedIds||selectedItemIds;if(selIds&&selIds.size>0&&selIds.has(itemId)){var selArr=Array.from(selIds);var originals={};curTracks.forEach(function(t){(t.sections||[]).forEach(function(s){if(selArr.indexOf(s.id)>=0)originals[s.id]={type:'section',start:s.start,trackId:t.id};});(t.midiItems||[]).forEach(function(m){if(selArr.indexOf(m.id)>=0)originals[m.id]={type:'midiItem',start:m.startTime,trackId:t.id};});(t.clips||[]).forEach(function(c){var cid=c.id==='default'?'default_'+t.id:c.id;if(selArr.indexOf(cid)>=0)originals[cid]={type:'clip',start:c.startTime,trackId:t.id};});});if(Object.keys(originals).length>0)multiIds=originals;}if(isDuplicate){var track=curTracks.find(function(t){return t.id===trackId;});if(!track)return;if(multiIds){var newOriginals={};updateActiveTracks(function(prev){return prev.map(function(t){var updatedSections=t.sections?t.sections.slice():[];var updatedMidi=t.midiItems?t.midiItems.slice():[];var updatedClips=t.clips?t.clips.slice():[];Object.keys(multiIds).forEach(function(oid){var info=multiIds[oid];if(info.type==='section'){var sec=(t.sections||[]).find(function(s){return s.id===oid;});if(sec){var rearrangeNewId='sec_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedSections.push({...sec,id:rearrangeNewId,name:sec.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'section',start:sec.start};}}else if(info.type==='midiItem'){var mid=(t.midiItems||[]).find(function(m){return m.id===oid;});if(mid){var rearrangeNewId='midi_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedMidi.push({...mid,id:rearrangeNewId,name:mid.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'midiItem',start:mid.startTime};}}else if(info.type==='clip'){var clip=(t.clips||[]).find(function(c){return c.id===oid||'default_'+t.id===oid;});if(clip){var rearrangeNewId='clip_dup_'+Date.now()+'_'+Math.random().toString(36).substr(2,5);updatedClips.push({...clip,id:rearrangeNewId,startTime:clip.startTime,name:clip.name+' (Copy)'});newOriginals[rearrangeNewId]={type:'clip',start:clip.startTime};}}});return{...t,sections:updatedSections,midiItems:updatedMidi,clips:updatedClips};});});var newItemId=Object.keys(newOriginals)[0]||itemId;var origPos=newOriginals[newItemId]||{start:0};setDraggedSectionItem({trackId,itemType,itemId:newItemId,clickOffset,multiIds:newOriginals,originalPositions:{[newItemId]:origPos.start}});}else{var items=itemType==='section'?track.sections||[]:track.midiItems||[];var item=items.find(function(it){return it.id===itemId;});if(!item)return;var rearrangeNewId=itemType+'_dup_'+Date.now();var newItem={...item,id:rearrangeNewId,name:item.name+' (Copy)'};updateActiveTracks(function(prev){return prev.map(function(t){if(t.id!==trackId)return t;var updated=itemType==='section'?[...(t.sections||[]),newItem]:[...(t.midiItems||[]),newItem];return itemType==='section'?{...t,sections:updated}:{...t,midiItems:updated};});});setDraggedSectionItem({trackId,itemType,itemId:rearrangeNewId,clickOffset,isDuplicate:false,originalPositions:{[rearrangeNewId]:itemType==='section'?item.start:item.startTime}});}}else{var curTrk=activeTracksRef.current?activeTracksRef.current.find(t=>t.id===trackId):null;var its=itemType==='section'?curTrk?.sections||[]:curTrk?.midiItems||[];var it=its.find(function(x){return x.id===itemId;});var origPos=it?itemType==='section'?it.start:it.startTime:0;setDraggedSectionItem({trackId,itemType,itemId,clickOffset,multiIds,originalPositions:{[itemId]:origPos}});}};handleSectionItemDragStartRef.current=handleSectionItemDragStart;// ── Section / MIDI Item Resize Start ──
 const handleSectionItemResizeStart=(trackId,itemType,itemId,side,clickTime)=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===trackId);if(!track)return;const items=itemType==='section'?track.sections:track.midiItems;const item=(items||[]).find(it=>it.id===itemId);if(!item)return;const start=itemType==='section'?item.start:item.startTime;setResizedSectionItem({trackId,itemType,itemId,side,originalStart:start,originalDuration:item.duration});};// ── Document-level mousemove/mouseup for Section/MIDI item drag ──
 useEffect(()=>{const handleMouseMove=e=>{const drag=draggedSectionItemRef.current;if(!drag)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);const beatSec=60.0/(parseInt(bpm)||120);const secondsPerBar=beatSec*4;const marginBar=maxDurationRef.current-secondsPerBar;const rawStart=Math.max(0,Math.min(time-drag.clickOffset,marginBar));const newStart=snapTime(rawStart,snapValueRef.current,bpmRef.current);const itemPx=newStart*zoom;const keepMargin=80;if(itemPx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=itemPx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(itemPx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,itemPx-keepMargin);setCanvasRedrawCount(n=>n+1);}// Compute target track from mouse Y position
 var allTrks=activeTracksRef.current||[];var mouseY=e.clientY-rect.top;var trackTop=0;var targetIdx=-1;for(var ti=0;ti<allTrks.length;ti++){var tH=allTrks[ti].height||(allTrks[ti].isArmed?164:140);if(mouseY>=trackTop&&mouseY<trackTop+tH){targetIdx=ti;break;}trackTop+=tH;}if(targetIdx<0)targetIdx=mouseY<trackTop?0:Math.max(0,allTrks.length-1);var targetTrackId=allTrks[targetIdx]?allTrks[targetIdx].id:drag.trackId;// Use ORIGINAL trackId from drag start for crossOffset math (never changes)
@@ -349,15 +345,10 @@ var dragBaseTrackId=drag.multiIds&&drag.multiIds[drag.itemId]?drag.multiIds[drag
 var baseIdx=allTrks.findIndex(function(tr){return tr.id===dragBaseTrackId;});if(baseIdx<0)baseIdx=0;var trgIdx=allTrks.findIndex(function(tr){return tr.id===targetTrackId;});if(trgIdx<0)trgIdx=allTrks.length-1;if(trgIdx<0)trgIdx=0;var crossOffset=trgIdx-baseIdx;// Special path for multi-select drag: handle items from multiple tracks
 if(drag.multiIds){var dragOrigStart=drag.multiIds[drag.itemId]?drag.multiIds[drag.itemId].start:0;var delta=newStart-dragOrigStart;// Extend activeTracks if target track index exceeds track count
 var outTracks=[];Object.keys(drag.multiIds).forEach(function(mid){var inf=drag.multiIds[mid];var oIdx=allTrks.findIndex(function(tr){return tr.id===inf.trackId;});if(oIdx<0)oIdx=baseIdx;var needIdx=oIdx+crossOffset;if(needIdx>=allTrks.length){for(var ai=allTrks.length;ai<=needIdx;ai++){var exists=outTracks.some(function(ot){return ot.id===(ai+1).toString();});if(!exists){var colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309'];outTracks.push({id:(ai+1).toString(),name:'Track '+(ai+1),buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:colors[ai%colors.length],clips:[],midiItems:[],sections:[],markers:[],isArmed:false,height:140});}}}});updateActiveTracks(function(prev){var trkIds=prev.map(function(tr){return tr.id;});var merged=outTracks.length>0?prev.concat(outTracks.filter(function(ot){return!trkIds.includes(ot.id);})):prev;var allIds=merged.map(function(tr){return tr.id;});return merged.map(function(t){var resS=(t.sections||[]).slice();var resM=(t.midiItems||[]).slice();var resC=(t.clips||[]).slice();Object.keys(drag.multiIds).forEach(function(mid){var inf=drag.multiIds[mid];var newVal=inf.start+delta;var oIdx=allIds.indexOf(inf.trackId);if(oIdx<0)oIdx=baseIdx;var needIdx=Math.max(0,oIdx+crossOffset);var targetTid=needIdx<merged.length?merged[needIdx].id:merged[merged.length-1].id;if(inf.type==='section'){resS=resS.filter(function(s){return s.id!==mid;});if(t.id===targetTid){var src=null;for(var p=0;p<prev.length;p++){src=(prev[p].sections||[]).find(function(s){return s.id===mid;});if(src)break;}if(src)resS.push({...src,start:Math.max(0,newVal)});}}else if(inf.type==='midiItem'){resM=resM.filter(function(mx){return mx.id!==mid;});if(t.id===targetTid){var src=null;for(var p=0;p<prev.length;p++){src=(prev[p].midiItems||[]).find(function(mx){return mx.id===mid;});if(src)break;}if(src)resM.push({...src,startTime:Math.max(0,newVal)});}}else if(inf.type==='clip'){var cid3='default_'+t.id;resC=resC.filter(function(cx){return cx.id!==mid&&cx.id!==cid3;});if(t.id===targetTid){var src=null;for(var p=0;p<prev.length;p++){var c2=(prev[p].clips||[]).find(function(cx){return cx.id===mid||'default_'+prev[p].id===mid;});if(c2){src=c2;break;}}if(src)resC.push({...src,startTime:Math.max(0,newVal)});}}});return{...t,sections:resS,midiItems:resM,clips:resC};});});}else{// Single item drag path
-updateActiveTracks(function(prev){let movedItem=null;for(let track of prev){const sec=(track.sections||[]).find(function(it){return it.id===drag.itemId;});const mid=(track.midiItems||[]).find(function(it){return it.id===drag.itemId;});if(sec||mid){movedItem=sec||mid;break;}}return prev.map(function(tr){var its=drag.itemType==='section'?(tr.sections||[]).filter(function(it){return it.id!==drag.itemId;}):(tr.midiItems||[]).filter(function(it){return it.id!==drag.itemId;});if(tr.id===targetTrackId&&movedItem){its.push(drag.itemType==='section'?{...movedItem,start:newStart}:{...movedItem,startTime:newStart});}return drag.itemType==='section'?{...tr,sections:its}:{...tr,midiItems:its};});});}};const handleMouseUp=()=>{const drag=draggedSectionItemRef.current;if(!drag)return;setDraggedSectionItem(null);showToast(`Đã di chuyển ${drag.itemType==='section'?'section':'MIDI item'}.`,'success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Pending drag: Ctrl+click toggles selection; mousemove > threshold starts copy-drag ──
+updateActiveTracks(function(prev){let movedItem=null;for(let track of prev){const sec=(track.sections||[]).find(function(it){return it.id===drag.itemId;});const mid=(track.midiItems||[]).find(function(it){return it.id===drag.itemId;});if(sec||mid){movedItem=sec||mid;break;}}return prev.map(function(tr){var its=drag.itemType==='section'?(tr.sections||[]).filter(function(it){return it.id!==drag.itemId;}):(tr.midiItems||[]).filter(function(it){return it.id!==drag.itemId;});if(tr.id===targetTrackId&&movedItem){its.push(drag.itemType==='section'?{...movedItem,start:newStart}:{...movedItem,startTime:newStart});}return drag.itemType==='section'?{...tr,sections:its}:{...tr,midiItems:its};});});}};const handleMouseUp=()=>{const drag=draggedSectionItemRef.current;if(!drag)return;var changed=false;var trackId=drag.trackId;var beforeSnap=captureTrackSnapshot(trackId);var origs=drag.originalPositions||{};updateActiveTracks(function(prev){return prev.map(function(t){var allItemIds=Object.keys(origs);var updatedSections=(t.sections||[]).slice();var updatedMidi=(t.midiItems||[]).slice();var hasChange=false;for(var i=0;i<allItemIds.length;i++){var oid=allItemIds[i];var origStart=origs[oid];if(t.id===trackId||drag.multiIds&&Object.values(drag.multiIds).some(function(v){return v.trackId===t.id&&v.type===(oid.startsWith('sec_')?'section':oid.startsWith('midi_')?'midiItem':'clip');})){var sec=updatedSections.find(function(s){return s.id===oid;});var mid=updatedMidi.find(function(m){return m.id===oid;});var item=sec||mid;if(item){var curStart=sec?item.start:item.startTime;if(Math.abs(curStart-origStart)>0.001){hasChange=true;changed=true;if(sec)item.start=origStart;if(mid)item.startTime=origStart;}}}}if(!hasChange)return t;return{...t,sections:updatedSections,midiItems:updatedMidi};});});if(changed){var afterSnap=captureTrackSnapshot(trackId);pushAction('MOVE_ITEM',trackId,beforeSnap,afterSnap);}setDraggedSectionItem(null);showToast('Đã di chuyển '+(drag.itemType==='section'?'section':'MIDI item')+'.','success');};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Pending drag: Ctrl+click toggles selection; mousemove > threshold starts copy-drag ──
 useEffect(()=>{const handleMouseMove=e=>{var pd=pendingDragRef.current;if(!pd)return;var dx=e.clientX-pd.startX;if(Math.abs(dx)>5){var pdSnap=pendingDragRef.current;pendingDragRef.current=null;if(handleSectionItemDragStartRef.current)handleSectionItemDragStartRef.current(pdSnap.trackId,pdSnap.itemType,pdSnap.itemId,pdSnap.clickOffset,true,pdSnap.selectedIds);}};document.addEventListener('mousemove',handleMouseMove);var handleMouseUp=function(){pendingDragRef.current=null;};document.addEventListener('mouseup',handleMouseUp);return function(){document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);pendingDragRef.current=null;};},[]);// ── Document-level mousemove/mouseup for Section/MIDI item resize ──
 useEffect(()=>{const handleMouseMove=e=>{const resize=resizedSectionItemRef.current;if(!resize)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;autoScrollTimeline(e.clientX);const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);updateActiveTracks(prev=>prev.map(t=>{if(t.id!==resize.trackId)return t;const items=resize.itemType==='section'?[...(t.sections||[])]:[...(t.midiItems||[])];const idx=items.findIndex(it=>it.id===resize.itemId);if(idx===-1)return t;const item=items[idx];if(resize.side==='left'){const beatSec=60.0/(parseInt(bpm)||120);const newStart=Math.max(0,Math.min(time,resize.originalStart+resize.originalDuration-0.1));const end=resize.originalStart+resize.originalDuration;const newDuration=end-newStart;if(newDuration<0.1)return t;items[idx]=resize.itemType==='section'?{...item,start:newStart,duration:newDuration}:{...item,startTime:newStart,duration:newDuration};}else{const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const marginBar=maxDurationRef.current-secondsPerBar;const clampedTime=Math.min(time,marginBar);const snappedDuration=snapValueRef.current!=='free'?snapTime(clampedTime-resize.originalStart,snapValueRef.current,bpm):clampedTime-resize.originalStart;const newDuration=Math.max(0.1,snappedDuration);items[idx]={...item,duration:newDuration};}return resize.itemType==='section'?{...t,sections:items}:{...t,midiItems:items};}));setCanvasRedrawCount(n=>n+1);const edgePx=(resize.side==='left'?Math.max(0,time):time)*zoom;const keepMargin=80;if(edgePx>scrollLeft+rect.width-keepMargin){wrapper.scrollLeft=edgePx-rect.width+keepMargin;setCanvasRedrawCount(n=>n+1);}else if(edgePx<scrollLeft+keepMargin){wrapper.scrollLeft=Math.max(0,edgePx-keepMargin);setCanvasRedrawCount(n=>n+1);}};const handleMouseUp=()=>{const resize=resizedSectionItemRef.current;if(!resize)return;setResizedSectionItem(null);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom,activeTab,sessionTabs]);// ── Sweep Select mousemove/mouseup ──
-useEffect(()=>{const handleMouseMove=e=>{if(!isSweepingRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);setSweepSelect(prev=>{var updated=prev?{...prev,endTime:time}:null;sweepSelectRef.current=updated;return updated;});};const handleMouseUp=()=>{if(!isSweepingRef.current)return;isSweepingRef.current=false;sweepTrackIdRef.current=null;const sweep=sweepSelectRef.current;sweepSelectRef.current=null;if(sweep){const start=Math.min(sweep.startTime,sweep.endTime);const end=Math.max(sweep.startTime,sweep.endTime);// Small movement (no real drag) → deselect all
-if(Math.abs(end-start)<0.02){setSelectedItemIds(new Set());setSweepSelect(null);return;}// Real drag → toggle items that overlap the marquee
-const curTracks=activeTracksRef.current||[];const found=new Set();curTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.startTime<end&&m.startTime+m.duration>start){found.add(m.id);}});(t.sections||[]).forEach(s=>{if(s.start<end&&s.start+s.duration>start){found.add(s.id);}});(t.clips||[]).forEach(c=>{const dur=c.buffer?c.buffer.duration/(c.speed||1.0):4;if(c.startTime<end&&c.startTime+dur>start){const cid=c.id==='default'?'default_'+t.id:c.id;found.add(cid);}});});// Toggle: add unselected, remove already-selected
-setSelectedItemIds(prev=>{const next=new Set(prev);found.forEach(id=>{if(next.has(id))next.delete(id);else next.add(id);});return next;});setSweepSelect(null);sweepTrackIdRef.current=null;}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);const handleSelectRange=(start,end,reset)=>{const maxLen=maxDuration;const cleanStart=Math.max(0,Math.min(maxLen,start));const cleanEnd=Math.max(0,Math.min(maxLen,end));if(reset){setSelectionStart(cleanStart);setSelectionEnd(cleanEnd);}else{setSelectionEnd(cleanEnd);}// LOOP_EDITOR_2.md §4.2: new selection = enable looping
-setSelectionCleared(false);};const handleSelectionInputChange=(field,val)=>{const numericVal=Math.max(0,parseFloat(val)||0);if(selectionMode==='local'){// Editing local selection directly
-if(field==='start'){setLocalSelectionStart(numericVal);}else{setLocalSelectionEnd(numericVal);}}else{if(field==='start'){setSelectionStart(numericVal);}else{setSelectionEnd(numericVal);}}};const selectionStats=useMemo(()=>{if(selLeft===null||selRight===null){return{start:0,end:0,length:0};}const s=Math.min(selLeft,selRight);const e=Math.max(selLeft,selRight);return{start:parseFloat(s.toFixed(3)),end:parseFloat(e.toFixed(3)),length:parseFloat((e-s).toFixed(3))};},[selLeft,selRight]);// ── Handle Drag (selection resize) ──
+useEffect(()=>{const handleMouseMove=e=>{if(!isSweepingRef.current)return;const wrapper=timelineWrapperRef.current;if(!wrapper)return;const rect=wrapper.getBoundingClientRect();const scrollLeft=wrapper.scrollLeft;const mouseX=e.clientX-rect.left+scrollLeft;const time=Math.max(0,mouseX/zoom-leadInMarginRef.current);setSweepSelect(prev=>{var updated=prev?{...prev,endTime:time}:null;sweepSelectRef.current=updated;return updated;});};const handleMouseUp=()=>{if(!isSweepingRef.current)return;isSweepingRef.current=false;sweepTrackIdRef.current=null;const sweep=sweepSelectRef.current;sweepSelectRef.current=null;captureSelectionUndo();if(sweep){const start=Math.min(sweep.startTime,sweep.endTime);const end=Math.max(sweep.startTime,sweep.endTime);if(Math.abs(end-start)<0.02){setSelectedItemIds(new Set());setSweepSelect(null);pushSelectionUndo();return;}const curTracks=activeTracksRef.current||[];const found=new Set();curTracks.forEach(t=>{(t.midiItems||[]).forEach(m=>{if(m.startTime<end&&m.startTime+m.duration>start){found.add(m.id);}});(t.sections||[]).forEach(s=>{if(s.start<end&&s.start+s.duration>start){found.add(s.id);}});(t.clips||[]).forEach(c=>{const dur=c.buffer?c.buffer.duration/(c.speed||1.0):4;if(c.startTime<end&&c.startTime+dur>start){const cid=c.id==='default'?'default_'+t.id:c.id;found.add(cid);}});});setSelectedItemIds(prev=>{const next=new Set(prev);found.forEach(id=>{if(next.has(id))next.delete(id);else next.add(id);});return next;});setSweepSelect(null);sweepTrackIdRef.current=null;pushSelectionUndo();}};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);return()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};},[zoom]);const handleSelectRange=(start,end,reset)=>{captureSelectionUndo();const maxLen=maxDuration;const cleanStart=Math.max(0,Math.min(maxLen,start));const cleanEnd=Math.max(0,Math.min(maxLen,end));if(reset){setSelectionStart(cleanStart);setSelectionEnd(cleanEnd);}else{setSelectionEnd(cleanEnd);}setSelectionCleared(false);pushSelectionUndo();};const handleSelectionInputChange=(field,val)=>{captureSelectionUndo();const numericVal=Math.max(0,parseFloat(val)||0);if(selectionMode==='local'){if(field==='start'){setLocalSelectionStart(numericVal);}else{setLocalSelectionEnd(numericVal);}}else{if(field==='start'){setSelectionStart(numericVal);}else{setSelectionEnd(numericVal);}}pushSelectionUndo();};const selectionStats=useMemo(()=>{if(selLeft===null||selRight===null){return{start:0,end:0,length:0};}const s=Math.min(selLeft,selRight);const e=Math.max(selLeft,selRight);return{start:parseFloat(s.toFixed(3)),end:parseFloat(e.toFixed(3)),length:parseFloat((e-s).toFixed(3))};},[selLeft,selRight]);// ── Handle Drag (selection resize) ──
 const handleHandleDragStart=(e,side)=>{e.preventDefault();e.stopPropagation();const startX=e.clientX;const useLocal=selectionMode==='local';const currentStart=useLocal?localSelectionStart:selectionStart;const currentEnd=useLocal?localSelectionEnd:selectionEnd;const initialLeft=Math.min(currentStart,currentEnd);const initialRight=Math.max(currentStart,currentEnd);const setStart=useLocal?setLocalSelectionStart:setSelectionStart;const setEnd=useLocal?setLocalSelectionEnd:setSelectionEnd;const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;if(side==='left'){const newLeft=Math.max(0,Math.min(initialRight-0.05,initialLeft+deltaSec));setStart(newLeft);setEnd(initialRight);}else{const newRight=Math.max(initialLeft+0.05,Math.min(maxDuration,initialRight+deltaSec));setStart(initialLeft);setEnd(newRight);}};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};const handleSelectionBodyDragStart=e=>{e.preventDefault();e.stopPropagation();const startX=e.clientX;const useLocal=selectionMode==='local';const currentStart=useLocal?localSelectionStart:selectionStart;const currentEnd=useLocal?localSelectionEnd:selectionEnd;const initialLeft=Math.min(currentStart,currentEnd);const initialRight=Math.max(currentStart,currentEnd);const widthSec=initialRight-initialLeft;const setStart=useLocal?setLocalSelectionStart:setSelectionStart;const setEnd=useLocal?setLocalSelectionEnd:setSelectionEnd;const handleMouseMove=moveEvent=>{const deltaX=moveEvent.clientX-startX;const deltaSec=deltaX/zoom;let newLeft=initialLeft+deltaSec;let newRight=initialRight+deltaSec;if(newLeft<0){newLeft=0;newRight=widthSec;}if(newRight>maxDuration){newRight=maxDuration;newLeft=maxDuration-widthSec;}setStart(newLeft);setEnd(newRight);};const handleMouseUp=()=>{document.removeEventListener('mousemove',handleMouseMove);document.removeEventListener('mouseup',handleMouseUp);};document.addEventListener('mousemove',handleMouseMove);document.addEventListener('mouseup',handleMouseUp);};// ── Track Controls ──
 const toggleTrackSoloEvaluate=trackId=>{const wasPlaying=isPlaying;stopAllPlayback();setTracks(prev=>prev.map(t=>{if(t.id===trackId){return{...t,solo:!t.solo,muted:false};}return{...t,solo:false};}));if(wasPlaying){setTimeout(()=>{startOffsetTimeRef.current=currentTime;startAudioTimeRef.current=getAudioContext().currentTime;setIsPlaying(true);},50);}setTimeout(()=>lucide.createIcons(),50);};const toggleTrackMute=trackId=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,muted:!t.muted}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'MUTE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});setTimeout(()=>lucide.createIcons(),50);};const updateTrackProp=(trackId,props)=>{setTracks(prev=>prev.map(t=>t.id===trackId?{...t,...props}:t));setTimeout(()=>lucide.createIcons(),50);};const toggleTrackDrum=trackId=>{setTracks(prev=>prev.map(t=>t.id===trackId?{...t,is_percussion:!t.is_percussion,soundfont_bank:!t.is_percussion?128:t._saved_sf_bank!==undefined?t._saved_sf_bank:0,synth_engine:t.synth_engine?{...t.synth_engine,soundfont_bank:!t.is_percussion?128:0}:t.synth_engine}:t));setTimeout(()=>lucide.createIcons(),50);};const updateTrackVolumeDb=(trackId,val)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,volumeDb:val}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'VOLUME_CHANGE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});// Real-time update during playback
 const nodes=activeTrackNodesRef.current[trackId];if(nodes){const volLinear=val<=-50?0:Math.pow(10,val/20);nodes.gainNode.gain.setValueAtTime(volLinear,getAudioContext().currentTime);}};const updateTrackPan=(trackId,val)=>{const beforeSnap=captureTrackSnapshot(trackId);setTracks(prev=>prev.map(t=>t.id===trackId?{...t,pan:val}:t));setUndoStack(prev=>{const next=[...prev,{action_type:'PAN_CHANGE',track_id:trackId,timestamp:Date.now(),before_state:beforeSnap,after_state:captureTrackSnapshot(trackId)}];if(next.length>MAX_UNDO)next.shift();return next;});// Real-time update during playback
@@ -385,9 +376,9 @@ const trackData=[0x4D,0x54,0x72,0x6B];// "MTrk"
 const len=trackBytes.length;trackData.push(len>>24&0xFF,len>>16&0xFF,len>>8&0xFF,len&0xFF);trackData.push(...trackBytes);midiTracks.push(trackData);});if(midiTracks.length===0){showToast("Không có dữ liệu MIDI nào để xuất.","warning");return;}// Header: "MThd" + length(6) + format(1) + tracks + division
 const header=[0x4D,0x54,0x68,0x64,0x00,0x00,0x00,0x06,0x00,0x01,midiTracks.length>>8&0xFF,midiTracks.length&0xFF,ppq>>8&0xFF,ppq&0xFF];const allBytes=header.concat(...midiTracks.flat());const uint8=new Uint8Array(allBytes);const blob=new Blob([uint8],{type:'audio/midi'});const url=URL.createObjectURL(blob);const a=document.createElement('a');a.href=url;a.download=(projectName||'Project')+'.mid';document.body.appendChild(a);a.click();document.body.removeChild(a);URL.revokeObjectURL(url);showToast(`Đã xuất file MIDI với ${midiTracks.length} tracks!`,"success");};function writeVLQ(bytes,value){if(value<0)value=0;const buf=[];buf.push(value&0x7F);while(value>0x7F){value>>=7;buf.push(0x80|value&0x7F);}buf.reverse();buf.forEach(b=>bytes.push(b));}// ── Insert Track Below Selected ──
 const insertTrackBelow=()=>{const curTracks=activeTracks;const rearrangeNewId=`t${Date.now()}`;const colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309'];const selectColor=colors[curTracks.length%colors.length];const newTrack={id:rearrangeNewId,name:`Track ${rearrangeNewId}`,buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:selectColor,markers:[],serverFileId:null,clips:[],sections:[],midiItems:[]};updateActiveTracks(prev=>{const idx=prev.findIndex(t=>t.id===selectedTrackId);if(idx===-1)return[...prev,newTrack];const copy=[...prev];copy.splice(idx+1,0,newTrack);return copy;});setSelectedTrackId(rearrangeNewId);showToast(`Đã thêm Track ${rearrangeNewId}.`,'info');setTimeout(()=>lucide.createIcons(),200);};// ── Insert Section at Playhead ──
-const insertSectionAtPlayhead=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const section={id:`sec_${Date.now()}`,name:'Section',start:currentTime,duration:4*secondsPerBar,length_bars:4,color:track.color||'#06b6d4'};updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,sections:[...(t.sections||[]),section]}:t));showToast(`Đã thêm Section tại ${currentTime.toFixed(2)}s`,'success');};// ── Insert MIDI Item at Playhead ──
-const insertMidiItemAtPlayhead=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const midiItem={id:`midi_${Date.now()}`,name:'MIDI Item',startTime:currentTime,duration:4*secondsPerBar,length_bars:4,notes:[],color:'#a78bfa'};updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,midiItems:[...(t.midiItems||[]),midiItem]}:t));showToast(`Đã thêm MIDI item tại ${currentTime.toFixed(2)}s`,'success');};// ── Insert Sound Clip at Cursor ──
-const insertSoundClipAtCursor=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const input=document.createElement('input');input.type='file';input.accept='audio/*';input.multiple=true;input.onchange=async e=>{const files=Array.from(e.target.files||[]);if(!files.length)return;let offset=currentTime;let count=0;for(const file of files){try{uploadToServer(file,track.id);const{audioBuffer:decodedBuffer,channelInfo}=await window.SonicAudio.decodeAudioFile(file);const clipId=`clip_${Date.now()}_${Math.random().toString(36).slice(2,6)}`;const newClip={id:clipId,buffer:decodedBuffer,startTime:offset,name:file.name,speed:1.0};updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,clips:[...(t.clips||[]),newClip]}:t));offset+=decodedBuffer.duration;count++;}catch(err){showToast(`Lỗi nạp ${file.name}`,'error');}}if(count>0)showToast(`Đã chèn ${count} file âm thanh`,'success');};input.click();};// ── Server-side Export ──
+const insertSectionAtPlayhead=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const section={id:`sec_${Date.now()}`,name:'Section',start:currentTime,duration:4*secondsPerBar,length_bars:4,color:track.color||'#06b6d4'};createSectionWithUndo(selectedTrackId,section);updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,sections:[...(t.sections||[]),section]}:t));showToast(`Đã thêm Section tại ${currentTime.toFixed(2)}s`,'success');};// ── Insert MIDI Item at Playhead ──
+const insertMidiItemAtPlayhead=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const midiItem={id:`midi_${Date.now()}`,name:'MIDI Item',startTime:currentTime,duration:4*secondsPerBar,length_bars:4,notes:[],color:'#a78bfa'};createMidiWithUndo(selectedTrackId,midiItem);updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,midiItems:[...(t.midiItems||[]),midiItem]}:t));showToast(`Đã thêm MIDI item tại ${currentTime.toFixed(2)}s`,'success');};// ── Insert Sound Clip at Cursor ──
+const insertSoundClipAtCursor=()=>{const curTracks=activeTracks;const track=curTracks.find(t=>t.id===selectedTrackId);if(!track){showToast('Chọn track trước','warning');return;}const input=document.createElement('input');input.type='file';input.accept='audio/*';input.multiple=true;input.onchange=async e=>{const files=Array.from(e.target.files||[]);if(!files.length)return;let offset=currentTime;let count=0;for(const file of files){try{uploadToServer(file,track.id);const{audioBuffer:decodedBuffer,channelInfo}=await window.SonicAudio.decodeAudioFile(file);const clipId=`clip_${Date.now()}_${Math.random().toString(36).slice(2,6)}`;const newClip={id:clipId,buffer:decodedBuffer,startTime:offset,name:file.name,speed:1.0};createClipWithUndo(selectedTrackId,newClip);updateActiveTracks(prev=>prev.map(t=>t.id===selectedTrackId?{...t,clips:[...(t.clips||[]),newClip]}:t));offset+=decodedBuffer.duration;count++;}catch(err){showToast(`Lỗi nạp ${file.name}`,'error');}}if(count>0)showToast(`Đã chèn ${count} file âm thanh`,'success');};input.click();};// ── Server-side Export ──
 const triggerWavExport=async()=>{let exportTracks;let clipStart=0;let clipEnd=0;const src=exportSettings.source;if(src==='active_clip'||src==='clip_selection'){const selTrack=selectedTrackId?tracks.find(t=>t.id===selectedTrackId):null;if(!selTrack||!selTrack.buffer){showToast("Không có clip nào được chọn.","warning");return;}let rangeStart=selectionStart;let rangeEnd=selectionEnd;if(rangeStart===null||rangeEnd===null||rangeEnd<=rangeStart){rangeStart=0;rangeEnd=selTrack.buffer.duration;}const ctx=getAudioContext();const numCh=selTrack.buffer.numberOfChannels||1;const sr=selTrack.buffer.sampleRate;const startSample=Math.max(0,Math.floor(rangeStart*sr));const endSample=Math.min(selTrack.buffer.length,Math.floor(rangeEnd*sr));const len=endSample-startSample;if(len<=100){showToast("Vùng chọn quá ngắn hoặc không có dữ liệu.","warning");return;}const clipBuf=ctx.createBuffer(numCh,len,sr);for(let ch=0;ch<numCh;ch++){clipBuf.copyToChannel(selTrack.buffer.getChannelData(ch).subarray(startSample,endSample),ch);}exportTracks=[{...selTrack,buffer:clipBuf,startTime:0,clips:[{id:'export_clip',buffer:clipBuf,startTime:0,name:selTrack.name}]}];}else if(src==='track_mix'){const sel=tracks.filter(t=>t.buffer&&!t.muted);const selTrk=selectedTrackId?sel.filter(t=>t.id===selectedTrackId):sel;if(selTrk.length===0){showToast("Track được chọn không có dữ liệu.","warning");return;}exportTracks=selTrk;}else{exportTracks=tracks.filter(t=>t.buffer&&!t.muted);}if(exportTracks.length===0){showToast("Không tìm thấy dữ liệu âm thanh hợp lệ để xuất.","warning");return;}// Check if all active tracks have server file IDs
 const allOnServer=exportTracks.every(t=>serverFileIdMap[t.id]);if(allOnServer&&serverStatus==='connected'){// Use server-side export
 setIsExporting(true);showToast("Đang gửi yêu cầu xuất âm thanh đến máy chủ...","info");try{const sessionId=`session_${Date.now()}`;const tracksMeta=exportTracks.map(t=>({track_id:t.id,file_id:serverFileIdMap[t.id],volume_db:t.volumeDb,muted:false,clips:[{clip_id:`clip_${t.id}`,start_time_seconds:t.startTime||0,end_time_seconds:(t.startTime||0)+t.buffer.duration,loop_count:1,apply_zero_crossing:true,fade_in_ms:0,fade_out_ms:0}]}));const resp=await fetch(`${API_MULTITRACK}/mix`,{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({session_id:sessionId,export_settings:{sample_rate:parseInt(exportSettings.sampleRate),bit_depth:parseInt(exportSettings.bitDepth),format:exportSettings.format,channels:exportSettings.channels},tracks:tracksMeta})});if(!resp.ok)throw new Error(`Server export failed: ${resp.status}`);const data=await resp.json();showToast("Đang xử lý trên máy chủ...","info");// Poll for result
@@ -433,10 +424,8 @@ useEffect(()=>{if(typeof window.DAWCommandDispatcher==='undefined')return;const
 const itemStartTimeSec=currentTime;const newMidiItem={id:'item_ai_'+Date.now()+'_'+Math.random().toString(36).substr(2,5),name:`${composition_title||'AI Theme'} - ${aiTrack.track_name}`,parent_track_id:targetTrack.id,startTime:itemStartTimeSec,duration:durationSec,length_bars:total_bars,notes:aiTrack.notes.map((note,index)=>({id:`note_ai_${Date.now()}_${index}`,pitch:note.pitch,start_beat:note.start_beat,duration_beats:note.duration_beats,velocity:note.velocity||0.8,pan:0.0}))};targetTrack.midiItems=[...(targetTrack.midiItems||[]),newMidiItem];if(aiTrack.soundfont_bank!==undefined&&aiTrack.soundfont_program!==undefined){targetTrack.soundfont_bank=aiTrack.soundfont_bank;targetTrack.soundfont_program=aiTrack.soundfont_program;targetTrack.soundfont_id=aiTrack.soundfont_id||'';const sfEngine={type:'soundfont',plugin_id:aiTrack.soundfont_id?'sf_'+aiTrack.soundfont_id:null,soundfont_bank:aiTrack.soundfont_bank,soundfont_program:aiTrack.soundfont_program,soundfont_id:aiTrack.soundfont_id||''};targetTrack.synth_engine=sfEngine;if(window.SonicSF&&window.SonicSF.applyAITrackInstrument){window.SonicSF.applyAITrackInstrument(aiTrack.soundfont_bank,aiTrack.soundfont_program,sfEngine);}}});return updatedTracks;});showToast(`Đã nạp ${aiTracks.length} tracks MIDI thế hệ AI!`,'success');return{success:true};},rearrangeMidiMelody:args=>{const{rearrange_title,rearranged_notes,soundfont_id,soundfont_bank,soundfont_program}=args;if(!rearranged_notes||rearranged_notes.length===0){return{success:false,error:'No rearranged notes provided'};}const sourceTrackId=window.DAWCommandDispatcher?.rearrangeSourceTrackId||selectedTrackId;const sourceItemName=window.DAWCommandDispatcher?.rearrangeSourceItemName||'Source';const bpmVal=parseInt(bpm)||120;const secondsPerBeat=60.0/bpmVal;const secondsPerBar=secondsPerBeat*4;const totalBeats=rearranged_notes.reduce((max,n)=>Math.max(max,(n.start_beat||0)+(n.duration_beats||1)),0);const totalBars=Math.max(1,Math.ceil(totalBeats/4));const durationSec=totalBars*secondsPerBar;const rearrangeNewId=(activeTracks.length+1).toString();updateActiveTracks(prev=>{let updatedTracks=[...prev];// Find source track index to insert new track right after it
 const sourceIdx=sourceTrackId?updatedTracks.findIndex(t=>t.id===sourceTrackId||t.id==='track_'+sourceTrackId):-1;const insertIdx=sourceIdx>=0?sourceIdx+1:updatedTracks.length;const colors=['#0f766e','#1d4ed8','#701a75','#a21caf','#b45309'];const newTrack={id:rearrangeNewId,name:`[AI Rearrange] ${rearrange_title||'Variation'}`,type:'MIDI',volumeDb:0,pan:0,muted:false,solo:false,color:colors[insertIdx%colors.length],markers:[],serverFileId:null,clips:[],sections:[],midiItems:[{id:'item_rearr_'+Date.now()+'_'+Math.random().toString(36).substr(2,5),name:`[AI] ${rearrange_title||'Rearranged'} - var`,parent_track_id:rearrangeNewId,startTime:currentTime,duration:durationSec,length_bars:totalBars,notes:rearranged_notes.map((n,i)=>({id:`note_rearr_${Date.now()}_${i}`,pitch:Math.max(0,Math.min(127,n.pitch||60)),start_beat:Math.max(0,parseFloat(n.start_beat)||0),duration_beats:Math.max(0.125,parseFloat(n.duration_beats)||0.25),velocity:Math.max(0.1,Math.min(1.0,n.velocity??0.8)),pan:0.0}))}]};if(soundfont_id||soundfont_bank!==undefined&&soundfont_program!==undefined){newTrack.soundfont_id=soundfont_id||'';newTrack.soundfont_bank=soundfont_bank??0;newTrack.soundfont_program=soundfont_program??0;newTrack.synth_engine={type:'soundfont',plugin_id:soundfont_id?'sf_'+soundfont_id:null,soundfont_bank:soundfont_bank??0,soundfont_program:soundfont_program??0,soundfont_id:soundfont_id||''};}updatedTracks.splice(insertIdx,0,newTrack);return updatedTracks;});showToast(`✅ AI Rearrange: "${rearrange_title}" — ${rearranged_notes.length} notes`,'success');return{success:true,trackId:rearrangeNewId,totalBars};},createMidiItem:args=>{const trackId=args.track_id||selectedTrackId;if(!trackId)return{success:false,error:'No track_id provided'};const secondsPerBar=60.0/(parseInt(bpm)||120)*4;const startBar=args.start_bar!==undefined?parseFloat(args.start_bar):0;const lengthBars=args.length_bars!==undefined?parseFloat(args.length_bars):4;const midiItem={id:`midi_${Date.now()}_${Math.random().toString(36).substr(2,5)}`,name:'MIDI Item',parent_track_id:trackId,startTime:startBar*secondsPerBar,duration:lengthBars*secondsPerBar,notes:[],color:'#a78bfa'};updateActiveTracks(prev=>prev.map(t=>{if(t.id!==trackId&&t.id!=='track_'+trackId)return t;return{...t,midiItems:[...(t.midiItems||[]),midiItem]};}));return{success:true,itemId:midiItem.id,trackId};},modifyMidiNotes:args=>{const itemId=args.item_id;if(!itemId)return{success:false,error:'No item_id provided'};const noteNameToMidi=name=>{if(typeof name==='number')return name;if(!name||typeof name!=='string')return 60;const match=name.match(/^([A-Ga-g]#?|b?)(-?\d+)$/);if(!match){const num=parseInt(name);return isNaN(num)?60:num;}const noteNames={'c':0,'c#':1,'db':1,'d':2,'d#':3,'eb':3,'e':4,'f':5,'f#':6,'gb':6,'g':7,'g#':8,'ab':8,'a':9,'a#':10,'bb':10,'b':11};const key=match[1].toLowerCase();const octave=parseInt(match[2]);const base=noteNames[key]!==undefined?noteNames[key]:0;return(octave+1)*12+base;};const newNotes=(args.notes||[]).map((n,index)=>({id:`note_mod_${Date.now()}_${index}`,pitch:noteNameToMidi(n.pitch),start_beat:parseFloat(n.start_time||0),duration_beats:parseFloat(n.duration||1),velocity:n.velocity!==undefined?n.velocity/127.0:0.8,pan:0.0}));updateActiveTracks(prev=>prev.map(t=>{const items=t.midiItems||[];const exists=items.some(m=>m.id===itemId);if(!exists)return t;return{...t,midiItems:items.map(m=>m.id===itemId?{...m,notes:newNotes}:m)};}));return{success:true,itemId};}};window.DAWCommandDispatcher.registerDAWCommands(api);},[tracks,selectedTrackId,currentTime,bpm]);// ── Save AI config to localStorage ──
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diff --git a/app/storage/sonicforge.db b/app/storage/sonicforge.db
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diff --git a/md/45_MASTERING_MODULE.md b/md/45_MASTERING_MODULE.md
new file mode 100644
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+++ b/md/45_MASTERING_MODULE.md
@@ -0,0 +1,887 @@
+# TECHNICAL SPECIFICATION & OPERATIONAL WORKFLOW MANUAL: OZONE WEB MASTERING SUITE
+
+This document compiles the complete architectural layout, module inventory, control parameter specifications, dynamic re-routing execution matrices, visual metering systems, and full single-file implementation code for the Ozone-Style Web Mastering Engine.
+
+---
+
+## 1. AUDIO PROCESSING MODULES SUMMARY
+
+| Module Name | Core Function | Web Audio API Nodes / Class | Key Control Parameters | Inherited Acoustic Impact |
+| --- | --- | --- | --- | --- |
+| **Dynamic EQ** | Dynamic frequency filtering and equalization | `BiquadFilterNode` (`lowshelf`, `peaking`, `highshelf`) | 4-Band Gain ($-12 \text{ to } +12\text{ dB}$), Frequency, Q Factor | Balances frequency spectrum, carves out harsh resonances, or boosts air/warmth dynamically without introducing harsh clipping. |
+| **Stereo Imager** | Mid/Side spatial expansion and balance | `ChannelSplitterNode`, `ChannelMergerNode`, `GainNode` | 4-Band Width ($-100\% \text{ to } +100\%$), Mid/Side Gain | Expands stereo width across High/Mid bands while collapsing Low/Sub-bass bands to Mono for maximum low-end punch. |
+| **IRC IV Maximizer** | True-Peak Limiter & Peak Gain Boosting | `WaveShaperNode` (Soft Clip), `DynamicsCompressorNode` | Boost Gain ($+0 \text{ to } +12\text{ dB}$), Soft Clip %, Upward Comp, Ceiling | Maximizes perceived loudness (LUFS) to commercial distribution standards while suppressing transient spikes below $0\text{ dBFS}$. |
+| **Master Utilities** | I/O Management, Metering & Codec Emulation | `AnalyserNode` (FFT 2048), `GainNode` | Delta Listen, Gain Match, Codec Preview, Dither | Enables objective A/B listening tests between pre/post-mastered signals, emulates lossy MP3/AAC compression, and manages bit-depth reduction. |
+
+---
+
+## 2. PARAMETER CONTROL SPECIFICATIONS MATRIX
+
+| Module Group | Parameter Name | Range | Unit | Node Handler / Formula | Technical Purpose |
+| --- | --- | --- | --- | --- | --- |
+| **Dynamic EQ** | `eqLowGain` | $-12.0 \to +12.0$ | dB | Lowshelf @ $100\text{Hz}$ | Controls low-end punch and sub-bass weight. |
+| **Dynamic EQ** | `eqMid1Gain` | $-12.0 \to +12.0$ | dB | Peaking @ $822\text{Hz}$, $Q=0.7$ | Cleans up muddy or boxy low-mid frequencies. |
+| **Dynamic EQ** | `eqMid2Gain` | $-12.0 \to +12.0$ | dB | Peaking @ $3.2\text{kHz}$, $Q=1.2$ | Adjusts vocal clarity and instrument presence. |
+| **Dynamic EQ** | `eqHighGain` | $-12.0 \to +12.0$ | dB | Highshelf @ $10\text{kHz}$ | Adds high-frequency air, sheen, and sparkle. |
+| **Stereo Imager** | `w1` (Band 1) | $-100 \to +100$ | % | Mid/Side Gain ($0-100\text{Hz}$) | Collapses sub-bass to mono ($0\%$) to ensure club system compatibility. |
+| **Stereo Imager** | `w2` (Band 2) | $-100 \to +100$ | % | Mid/Side Gain ($100\text{Hz}-1\text{kHz}$) | Balances body and width for core instruments. |
+| **Stereo Imager** | `w3` (Band 3) | $-100 \to +100$ | % | Mid/Side Gain ($1\text{kHz}-6\text{kHz}$) | Expands upper-mid imaging for a wider soundstage. |
+| **Stereo Imager** | `w4` (Band 4) | $-100 \to +100$ | % | Mid/Side Gain ($6\text{kHz}-20\text{kHz}$) | Widens top-end spatial atmosphere. |
+| **Maximizer** | `maxGain` | $0.0 \to +12.0$ | dB | Gain Boost Node | Drives the signal into the limiter to increase overall LUFS. |
+| **Maximizer** | `maxUpward` | $0.0 \to +10.0$ | dB | Dynamic Range Expander | Brings up low-level details for a denser mix. |
+| **Maximizer** | `maxSoftClip` | $0 \to 100$ | % | Arctan WaveShaper Curve | Rounds off sharp transient peaks to add analog-style saturation. |
+| **Maximizer** | `ceiling` | $-6.0 \to 0.0$ | dBFS | Brickwall Limiter Threshold | Absolute ceiling threshold (Default: $-0.10\text{ dBFS}$). |
+
+---
+
+## 3. AUDIONODE GRAPH RE-ROUTING EVENT MATRIX
+
+| UI Action | Triggered Event | Audio Engine Method (`OzoneAudioChainManager`) | Node Graph Execution | Perceived Acoustic Effect |
+| --- | --- | --- | --- | --- |
+| **Add Module (`[+] Add`)** | Click Add Module button | `addModuleToChain(moduleName)` | Appends module to `moduleChain`, disconnects existing routing, and re-connects all nodes in sequence. | Introduces additional processing step to the signal chain prior to Master Out. |
+| **Remove Module (`[x] Remove`)** | Click Remove Module button | `removeModuleFromChain(moduleName)` | Filters module out of `moduleChain`, disconnects old connections, and connects remaining nodes directly. | Bypasses the removed module's processing, reducing latency and CPU load. |
+| **Reorder Chain** | Drag & Drop Module Card | `reorderChain(newArray)` | Disconnects the entire graph and rebuilds connections from scratch based on the new array order. | Alters processing order (e.g., Stereo Imager widening prior to EQ vs. post-EQ). |
+| **Toggle Module Power** | Click Module Power button | `state.moduleActive = !active; updateAudioParameters();` | Sets target band gains to $0\text{ dB}$ or bypasses signal around module. | Passes signal through the target module without tonal modification (flat response). |
+| **Master Bypass** | Click Master Bypass button | `toggleMasterBypass()` | Reroutes input directly: `inputAnalyser` $\to$ `masterBypassGain` $\to$ `outputAnalyser`. | Instantly returns signal to raw, unprocessed dry audio for A/B comparison. |
+
+---
+
+## 4. GRAPHICAL METERS & VISUALIZER CANVAS SYSTEMS
+
+| Visualizer Canvas | Source Audio Node | Rendering Math / Algorithm | Graphical Characteristics & Refresh Rate |
+| --- | --- | --- | --- |
+| **Dynamic EQ Spectrum** | `outputAnalyser.getByteFrequencyData()` | Logarithmic Frequency Scaling ($20\text{Hz} - 20\text{kHz}$) | Cyan composite EQ curve overlaid across a live 60 FPS FFT frequency spectrum fill. |
+| **Polar Vectorscope** | Channel Splitter (Independent L/R Signals) | Polar Coordinate Calculation ($\theta = \arctan(R/L)$, radius $r$) | 180° radial particle scatter plot depicting phase correlation and stereo width. |
+| **I/O Stereo VU Meters** | `inputAnalyser` & `outputAnalyser` | Peak Calculation ($dB = 20 \log_{10}(\text{level})$) using Time-Domain data | Vertical Green $\to$ Yellow $\to$ Red gradient meters with real-time numeric dBFS readouts. |
+
+---
+
+## 5. MASTER UTILITIES COMPARISON
+
+| Utility Feature | DSP Mechanism / Formula | Operational Purpose in Mastering |
+| --- | --- | --- |
+| **Delta Listen (`[i] Delta`)** | $S_{\text{Delta}}(t) = S_{\text{Input}}(t) - S_{\text{Output}}(t)$ | Isolates the exact signal difference being removed or compressed to prevent over-processing. |
+| **Gain Match** | $G_{\text{Match}} = \text{LUFS}_{\text{Input}} - \text{LUFS}_{\text{Output}}$ | Automatically matches output loudness to input level to enable objective A/B evaluations free from "louder is better" bias. |
+| **Codec Preview** | Low-pass Biquad Filter @ $16\text{kHz}$ | Simulates lossy high-frequency roll-off typical of 128 kbps MP3/AAC encoding. |
+| **Dither Processor** | Triangular PDF Noise Injection | Prevents quantization distortion when converting bit-depth from 32-bit Float down to 16-bit PCM. |
+
+---
+
+## 6. FULL SINGLE-FILE IMPLEMENTATION CODE
+
+Below is the complete single-file source code incorporating HTML5, Tailwind CSS, FontAwesome, HTML5 Canvas, and Web Audio API DSP engines modeling the iZotope Ozone mastering interface:
+
+```html
+<!DOCTYPE html>
+<html lang="en" class="h-full bg-slate-950 text-slate-100 select-none">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Ozone Mastering Studio Engine</title>
+  <!-- Tailwind CSS -->
+  <script src="https://cdn.tailwindcss.com"></script>
+  <!-- Font Awesome -->
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
+  <!-- Fonts -->
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap" rel="stylesheet">
+  
+  <style>
+    body { font-family: 'Inter', sans-serif; }
+    .font-mono { font-family: 'JetBrains Mono', monospace; }
+    
+    ::-webkit-scrollbar { width: 4px; height: 4px; }
+    ::-webkit-scrollbar-track { background: #080b12; }
+    ::-webkit-scrollbar-thumb { background: #1e293b; border-radius: 2px; }
+    ::-webkit-scrollbar-thumb:hover { background: #334155; }
+
+    .knob-container { touch-action: none; user-select: none; }
+    .knob-dial {
+      transition: transform 0.05s ease-out;
+      box-shadow: inset 0 1px 3px rgba(255,255,255,0.15), 0 3px 8px rgba(0,0,0,0.8);
+    }
+    
+    /* Ozone Theme Dark Gradient Panels */
+    .oz-panel {
+      background: linear-gradient(180deg, #131822 0%, #0d1118 100%);
+      border: 1px solid rgba(255, 255, 255, 0.07);
+    }
+    .oz-card {
+      background: #18202c;
+      border: 1px solid rgba(255, 255, 255, 0.1);
+    }
+    .oz-card-active {
+      background: #1e2a3a;
+      border-color: #38bdf8;
+      box-shadow: 0 0 12px rgba(56, 189, 248, 0.2);
+    }
+  </style>
+</head>
+<body class="h-full flex flex-col overflow-hidden bg-slate-950 text-slate-200">
+
+  <!-- TOP TRANSPORT & SESSION BAR -->
+  <header class="h-12 bg-slate-900/90 border-b border-slate-800/80 flex items-center justify-between px-4 z-30">
+    <div class="flex items-center gap-3">
+      <div class="w-7 h-7 rounded-lg bg-cyan-600 flex items-center justify-center font-bold text-white shadow-lg shadow-cyan-950">
+        <i class="fa-solid fa-atom text-xs"></i>
+      </div>
+      <div>
+        <h1 class="text-xs font-bold tracking-wider text-white flex items-center gap-2">
+          OZONE ADVANCED <span class="text-[9px] bg-cyan-950 text-cyan-400 border border-cyan-800/80 px-1.5 py-0.5 rounded font-mono">WEB MASTERING V10.5</span>
+        </h1>
+      </div>
+    </div>
+
+    <!-- Central Signal Generator & Transport -->
+    <div class="flex items-center gap-3 bg-slate-950 px-3 py-1 rounded-lg border border-slate-800/80">
+      <button id="playAudioBtn" class="px-3 py-1 bg-cyan-600 hover:bg-cyan-500 text-white rounded text-xs font-semibold flex items-center gap-1.5 transition-all shadow-md shadow-cyan-950">
+        <i class="fa-solid fa-play text-[10px]"></i> <span>Play Reference Loop</span>
+      </button>
+      <button id="stopAudioBtn" class="px-3 py-1 bg-slate-800 hover:bg-slate-700 text-slate-300 rounded text-xs font-semibold flex items-center gap-1.5 transition-all">
+        <i class="fa-solid fa-stop text-[10px]"></i> <span>Stop</span>
+      </button>
+
+      <div class="h-4 w-[1px] bg-slate-800 mx-1"></div>
+
+      <div class="flex items-center gap-2 text-xs font-mono">
+        <span class="text-slate-400 text-[11px]">Preset:</span>
+        <select id="masterPresetSelect" class="bg-slate-900 border border-slate-700 rounded px-2 py-0.5 text-xs text-cyan-300 outline-none focus:border-cyan-500">
+          <option value="adaptive">Adaptive Dynamic Master</option>
+          <option value="edm_club">EDM / Club Punch Maximizer</option>
+          <option value="wide_space">Cinematic Stereo Expansion</option>
+          <option value="transparent">Transparent High-Clarity Limiter</option>
+        </select>
+      </div>
+    </div>
+
+    <!-- Right Target Meter Info -->
+    <div class="flex items-center gap-3 text-xs font-mono">
+      <span class="text-slate-400 text-[11px]">Target LUFS:</span>
+      <span id="targetLufsText" class="text-cyan-400 font-bold bg-slate-950 border border-cyan-900/60 px-2 py-0.5 rounded">-11.0 LUFS</span>
+    </div>
+  </header>
+
+  <!-- MODULE RACK STRIP (OZONE UPPER MODULE BAR) -->
+  <div class="h-16 bg-slate-950 border-b border-slate-800 px-4 flex items-center gap-2 overflow-x-auto">
+    <span class="text-[10px] font-bold text-slate-500 uppercase tracking-widest mr-1 font-mono">MODULE CHAIN:</span>
+
+    <!-- Module 1: Dynamic EQ Card -->
+    <div id="cardDynamicEq" class="oz-card oz-card-active w-36 h-12 rounded-lg p-2 flex items-center justify-between cursor-pointer transition-all">
+      <div class="flex items-center gap-2">
+        <button id="toggleEqBtn" class="w-4 h-4 rounded-full bg-cyan-500 hover:bg-cyan-400 text-slate-950 flex items-center justify-center text-[9px] font-bold">
+          <i class="fa-solid fa-power-off"></i>
+        </button>
+        <div>
+          <div class="text-[11px] font-bold text-slate-200">Dynamic EQ</div>
+          <div class="text-[9px] text-cyan-400 font-mono">4-Band Peak</div>
+        </div>
+      </div>
+      <i class="fa-solid fa-chart-area text-slate-500 text-xs"></i>
+    </div>
+
+    <!-- Module 2: Stereo Imager Card -->
+    <div id="cardImager" class="oz-card w-36 h-12 rounded-lg p-2 flex items-center justify-between cursor-pointer transition-all">
+      <div class="flex items-center gap-2">
+        <button id="toggleImagerBtn" class="w-4 h-4 rounded-full bg-cyan-500 hover:bg-cyan-400 text-slate-950 flex items-center justify-center text-[9px] font-bold">
+          <i class="fa-solid fa-power-off"></i>
+        </button>
+        <div>
+          <div class="text-[11px] font-bold text-slate-200">Imager</div>
+          <div class="text-[9px] text-slate-400 font-mono">4-Band Width</div>
+        </div>
+      </div>
+      <i class="fa-solid fa-circle-nodes text-slate-500 text-xs"></i>
+    </div>
+
+    <!-- Module 3: Maximizer Card -->
+    <div id="cardMaximizer" class="oz-card w-36 h-12 rounded-lg p-2 flex items-center justify-between cursor-pointer transition-all">
+      <div class="flex items-center gap-2">
+        <button id="toggleMaximizerBtn" class="w-4 h-4 rounded-full bg-cyan-500 hover:bg-cyan-400 text-slate-950 flex items-center justify-center text-[9px] font-bold">
+          <i class="fa-solid fa-power-off"></i>
+        </button>
+        <div>
+          <div class="text-[11px] font-bold text-slate-200">Maximizer</div>
+          <div class="text-[9px] text-slate-400 font-mono">IRC IV True Peak</div>
+        </div>
+      </div>
+      <i class="fa-solid fa-gauge-high text-slate-500 text-xs"></i>
+    </div>
+
+    <!-- Empty Add Module Slot -->
+    <div class="w-24 h-12 rounded-lg border border-dashed border-slate-800 flex items-center justify-center text-slate-600 hover:text-slate-400 hover:border-slate-600 cursor-pointer transition-all">
+      <i class="fa-solid fa-plus text-sm"></i>
+    </div>
+  </div>
+
+  <!-- MAIN WORKSPACE CONTAINER -->
+  <main class="flex-1 flex overflow-hidden">
+    
+    <!-- LEFT MODULE WORKSPACE (DYNAMIC VISUALIZER & CONTROLS) -->
+    <div class="flex-1 flex flex-col bg-slate-950 relative overflow-y-auto">
+      
+      <!-- SUB HEADER TOOLBAR -->
+      <div class="h-9 bg-slate-900/60 border-b border-slate-800/80 px-4 flex items-center justify-between text-xs font-mono">
+        <div class="flex items-center gap-3">
+          <span class="text-slate-400 flex items-center gap-1.5"><i class="fa-solid fa-headphones text-cyan-400"></i> Delta Listen</span>
+          <select id="modeSelect" class="bg-slate-950 border border-slate-800 rounded px-2 py-0.5 text-[11px] text-slate-300 outline-none">
+            <option value="irc4">IRC IV - Classic</option>
+            <option value="irc3">IRC III - Balanced</option>
+            <option value="irc2">IRC II - Crisp</option>
+          </select>
+        </div>
+
+        <div class="flex items-center gap-2 text-[11px]">
+          <span class="text-slate-400">Learn Input Gain:</span>
+          <button id="learnGainBtn" class="bg-cyan-950 text-cyan-300 border border-cyan-800/80 px-2 py-0.5 rounded font-bold hover:bg-cyan-900 transition-colors">
+            -11.0 LUFS
+          </button>
+        </div>
+      </div>
+
+      <!-- VIEW 1: DYNAMIC EQ VISUALIZER & BAND SETTINGS -->
+      <div id="viewDynamicEq" class="flex-1 flex flex-col p-4 gap-4">
+        <!-- EQ Canvas Display -->
+        <div class="relative w-full h-64 bg-slate-950 border border-slate-800/90 rounded-xl overflow-hidden shadow-inner cursor-crosshair">
+          <canvas id="eqCanvas" class="w-full h-full block"></canvas>
+        </div>
+
+        <!-- EQ Band Control Panel (Ozone Band Settings Window) -->
+        <div class="oz-panel p-3 rounded-xl grid grid-cols-4 gap-3">
+          <!-- Band 1 (Low) -->
+          <div class="bg-slate-900/80 border border-slate-800 p-2.5 rounded-lg flex flex-col justify-between">
+            <div class="flex items-center justify-between text-xs font-bold text-cyan-400">
+              <span>BAND 1 (LOW)</span>
+              <span class="text-[10px] font-mono text-slate-400">100 Hz</span>
+            </div>
+            <div class="flex items-center justify-around my-2">
+              <div class="knob-container" data-param="eqLowGain" data-min="-12" data-max="12" data-value="1.5" data-unit="dB">
+                <div class="knob-dial w-9 h-9 rounded-full bg-slate-800 border-2 border-cyan-500 relative flex items-center justify-center shadow-md">
+                  <div class="knob-pointer w-0.5 h-3 bg-cyan-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <div class="text-center font-mono">
+                <span class="knob-val text-xs text-slate-200 font-bold">+1.5 dB</span>
+              </div>
+            </div>
+            <div class="text-[9px] text-slate-500 font-mono text-center">Shelf Filter</div>
+          </div>
+
+          <!-- Band 2 (Mid Low) -->
+          <div class="bg-slate-900/80 border border-slate-800 p-2.5 rounded-lg flex flex-col justify-between">
+            <div class="flex items-center justify-between text-xs font-bold text-amber-400">
+              <span>BAND 2 (MID LOW)</span>
+              <span class="text-[10px] font-mono text-slate-400">822 Hz</span>
+            </div>
+            <div class="flex items-center justify-around my-2">
+              <div class="knob-container" data-param="eqMid1Gain" data-min="-12" data-max="12" data-value="-1.0" data-unit="dB">
+                <div class="knob-dial w-9 h-9 rounded-full bg-slate-800 border-2 border-amber-500 relative flex items-center justify-center shadow-md">
+                  <div class="knob-pointer w-0.5 h-3 bg-amber-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <div class="text-center font-mono">
+                <span class="knob-val text-xs text-slate-200 font-bold">-1.0 dB</span>
+              </div>
+            </div>
+            <div class="text-[9px] text-slate-500 font-mono text-center">Dynamic Bell (Q: 0.7)</div>
+          </div>
+
+          <!-- Band 3 (Mid High) -->
+          <div class="bg-slate-900/80 border border-slate-800 p-2.5 rounded-lg flex flex-col justify-between">
+            <div class="flex items-center justify-between text-xs font-bold text-purple-400">
+              <span>BAND 3 (MID HIGH)</span>
+              <span class="text-[10px] font-mono text-slate-400">3.2 kHz</span>
+            </div>
+            <div class="flex items-center justify-around my-2">
+              <div class="knob-container" data-param="eqMid2Gain" data-min="-12" data-max="12" data-value="2.0" data-unit="dB">
+                <div class="knob-dial w-9 h-9 rounded-full bg-slate-800 border-2 border-purple-500 relative flex items-center justify-center shadow-md">
+                  <div class="knob-pointer w-0.5 h-3 bg-purple-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <div class="text-center font-mono">
+                <span class="knob-val text-xs text-slate-200 font-bold">+2.0 dB</span>
+              </div>
+            </div>
+            <div class="text-[9px] text-slate-500 font-mono text-center">Dynamic Bell (Q: 1.2)</div>
+          </div>
+
+          <!-- Band 4 (High) -->
+          <div class="bg-slate-900/80 border border-slate-800 p-2.5 rounded-lg flex flex-col justify-between">
+            <div class="flex items-center justify-between text-xs font-bold text-emerald-400">
+              <span>BAND 4 (HIGH)</span>
+              <span class="text-[10px] font-mono text-slate-400">10 kHz</span>
+            </div>
+            <div class="flex items-center justify-around my-2">
+              <div class="knob-container" data-param="eqHighGain" data-min="-12" data-max="12" data-value="1.8" data-unit="dB">
+                <div class="knob-dial w-9 h-9 rounded-full bg-slate-800 border-2 border-emerald-500 relative flex items-center justify-center shadow-md">
+                  <div class="knob-pointer w-0.5 h-3 bg-emerald-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <div class="text-center font-mono">
+                <span class="knob-val text-xs text-slate-200 font-bold">+1.8 dB</span>
+              </div>
+            </div>
+            <div class="text-[9px] text-slate-500 font-mono text-center">High Shelf</div>
+          </div>
+        </div>
+      </div>
+
+      <!-- VIEW 2: STEREO IMAGER VISUALIZER & CONTROLS (HIDDEN BY DEFAULT) -->
+      <div id="viewImager" class="flex-1 flex flex-col p-4 gap-4 hidden">
+        <div class="grid grid-cols-12 gap-4 flex-1">
+          <!-- Polar Vectorscope Canvas (8 Cols) -->
+          <div class="col-span-8 bg-slate-950 border border-slate-800/90 rounded-xl p-3 flex flex-col relative shadow-inner">
+            <span class="text-xs font-bold text-cyan-400 uppercase font-mono mb-2">
+              <i class="fa-solid fa-circle-nodes"></i> Polar Vectorscope & Correlation Meter
+            </span>
+            <div class="flex-1 relative w-full h-56 flex items-center justify-center">
+              <canvas id="imagerCanvas" class="w-full h-full block"></canvas>
+            </div>
+          </div>
+
+          <!-- Band Width Controls (4 Cols) -->
+          <div class="col-span-4 oz-panel p-3 rounded-xl flex flex-col justify-between">
+            <span class="text-xs font-bold text-slate-300 uppercase font-mono">4-Band Stereo Width</span>
+            
+            <div class="space-y-3 my-auto">
+              <div>
+                <div class="flex justify-between text-[11px] font-mono mb-1"><span class="text-cyan-400 font-bold">Band 1 (0-100Hz)</span><span id="w1Val">0%</span></div>
+                <input id="w1Slider" type="range" min="-100" max="100" value="0" class="w-full accent-cyan-500 h-1 cursor-pointer">
+              </div>
+              <div>
+                <div class="flex justify-between text-[11px] font-mono mb-1"><span class="text-amber-400 font-bold">Band 2 (100-1kHz)</span><span id="w2Val">+15%</span></div>
+                <input id="w2Slider" type="range" min="-100" max="100" value="15" class="w-full accent-amber-500 h-1 cursor-pointer">
+              </div>
+              <div>
+                <div class="flex justify-between text-[11px] font-mono mb-1"><span class="text-purple-400 font-bold">Band 3 (1k-6kHz)</span><span id="w3Val">+35%</span></div>
+                <input id="w3Slider" type="range" min="-100" max="100" value="35" class="w-full accent-purple-500 h-1 cursor-pointer">
+              </div>
+              <div>
+                <div class="flex justify-between text-[11px] font-mono mb-1"><span class="text-emerald-400 font-bold">Band 4 (6k-20kHz)</span><span id="w4Val">+50%</span></div>
+                <input id="w4Slider" type="range" min="-100" max="100" value="50" class="w-full accent-emerald-500 h-1 cursor-pointer">
+              </div>
+            </div>
+          </div>
+        </div>
+      </div>
+
+      <!-- VIEW 3: MAXIMIZER / LIMITER VISUALIZER & CONTROLS (HIDDEN BY DEFAULT) -->
+      <div id="viewMaximizer" class="flex-1 flex flex-col p-4 gap-4 hidden">
+        <div class="oz-panel p-4 rounded-xl flex-1 grid grid-cols-12 gap-6 items-center">
+          
+          <!-- Left Gain & Output Level Panel -->
+          <div class="col-span-4 flex flex-col items-center justify-center border-r border-slate-800 pr-4">
+            <span class="text-xs font-bold text-slate-400 uppercase font-mono mb-3">Maximizer Gain Boost</span>
+            
+            <div class="knob-container my-2" data-param="maxGain" data-min="0" data-max="12" data-value="5.4" data-unit="dB">
+              <div class="knob-dial w-24 h-24 rounded-full bg-slate-900 border-4 border-cyan-500 relative flex items-center justify-center shadow-2xl">
+                <div class="knob-pointer w-1 h-8 bg-cyan-400 rounded absolute top-2"></div>
+                <span class="knob-val text-sm font-bold font-mono text-cyan-300 z-10">+5.4 dB</span>
+              </div>
+            </div>
+
+            <div class="w-full mt-4 bg-slate-950 p-2 rounded-lg border border-slate-800 text-xs font-mono flex justify-between items-center">
+              <span class="text-slate-400">Ceiling Level:</span>
+              <span class="text-cyan-400 font-bold">-0.10 dB</span>
+            </div>
+          </div>
+
+          <!-- Center Upward Comp & Soft Clip Controls -->
+          <div class="col-span-8 grid grid-cols-3 gap-4">
+            <div class="bg-slate-950 p-3 border border-slate-800 rounded-xl flex flex-col items-center">
+              <span class="text-[10px] font-bold text-slate-400 font-mono mb-2">UPWARD COMPRESS</span>
+              <div class="knob-container" data-param="maxUpward" data-min="0" data-max="10" data-value="2.0" data-unit="dB">
+                <div class="knob-dial w-12 h-12 rounded-full bg-slate-800 border-2 border-cyan-500 relative flex items-center justify-center">
+                  <div class="knob-pointer w-0.5 h-4 bg-cyan-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <span class="knob-val text-xs font-mono text-slate-200 mt-2">+2.0 dB</span>
+            </div>
+
+            <div class="bg-slate-950 p-3 border border-slate-800 rounded-xl flex flex-col items-center">
+              <span class="text-[10px] font-bold text-slate-400 font-mono mb-2">SOFT CLIPPER</span>
+              <div class="knob-container" data-param="maxSoftClip" data-min="0" data-max="100" data-value="15" data-unit="%">
+                <div class="knob-dial w-12 h-12 rounded-full bg-slate-800 border-2 border-amber-500 relative flex items-center justify-center">
+                  <div class="knob-pointer w-0.5 h-4 bg-amber-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <span class="knob-val text-xs font-mono text-slate-200 mt-2">15%</span>
+            </div>
+
+            <div class="bg-slate-950 p-3 border border-slate-800 rounded-xl flex flex-col items-center">
+              <span class="text-[10px] font-bold text-slate-400 font-mono mb-2">TRANSIENT EMPHASIS</span>
+              <div class="knob-container" data-param="maxTransient" data-min="0" data-max="100" data-value="25" data-unit="%">
+                <div class="knob-dial w-12 h-12 rounded-full bg-slate-800 border-2 border-emerald-500 relative flex items-center justify-center">
+                  <div class="knob-pointer w-0.5 h-4 bg-emerald-400 rounded absolute top-1"></div>
+                </div>
+              </div>
+              <span class="knob-val text-xs font-mono text-slate-200 mt-2">25%</span>
+            </div>
+          </div>
+
+        </div>
+      </div>
+
+    </div>
+
+    <!-- RIGHT SIDEBAR: MASTER INPUT / OUTPUT STEREO METER TOWER -->
+    <div class="w-64 bg-slate-900 border-l border-slate-800/80 p-3 flex flex-col justify-between shadow-2xl font-mono text-xs z-20">
+      <div class="flex items-center justify-between border-b border-slate-800 pb-2 mb-2">
+        <span class="text-xs font-bold text-white tracking-wider uppercase flex items-center gap-1.5">
+          <i class="fa-solid fa-sliders text-cyan-400"></i> I/O METERS
+        </span>
+        <span class="text-[9px] bg-cyan-950 border border-cyan-800 text-cyan-300 px-1 py-0.5 rounded">TRUE PEAK</span>
+      </div>
+
+      <!-- Peak / RMS Numeric Display -->
+      <div class="grid grid-cols-2 gap-2 text-[10px] text-center mb-2">
+        <div class="bg-slate-950 border border-slate-800/80 p-1.5 rounded">
+          <div class="text-slate-500 font-bold">IN PEAK</div>
+          <div id="inPeakText" class="text-cyan-400 font-bold font-mono">-14.2 dB</div>
+        </div>
+        <div class="bg-slate-950 border border-slate-800/80 p-1.5 rounded">
+          <div class="text-slate-500 font-bold">OUT PEAK</div>
+          <div id="outPeakText" class="text-emerald-400 font-bold font-mono">-0.1 dB</div>
+        </div>
+      </div>
+
+      <!-- Level Meters Graphic Container -->
+      <div class="flex-1 bg-slate-950 border border-slate-800/90 rounded-xl p-2 flex justify-around relative overflow-hidden my-1">
+        <!-- Input Meters (L/R) -->
+        <div class="flex flex-col items-center h-full">
+          <span class="text-[9px] text-slate-500 mb-1">IN</span>
+          <div class="flex-1 w-5 bg-slate-900 border border-slate-800 rounded relative overflow-hidden flex items-end">
+            <canvas id="inMeterCanvas" class="w-full h-full block"></canvas>
+          </div>
+        </div>
+
+        <!-- Output Meters (L/R) -->
+        <div class="flex flex-col items-center h-full">
+          <span class="text-[9px] text-slate-500 mb-1">OUT</span>
+          <div class="flex-1 w-6 bg-slate-900 border border-slate-800 rounded relative overflow-hidden flex items-end">
+            <canvas id="outMeterCanvas" class="w-full h-full block"></canvas>
+          </div>
+        </div>
+      </div>
+
+      <!-- Global Utility Buttons (Ozone Right Side Action Bar) -->
+      <div class="grid grid-cols-2 gap-1.5 mt-2">
+        <button id="masterBypassBtn" class="bg-slate-800 hover:bg-slate-700 text-slate-200 py-1.5 rounded text-[10px] font-bold border border-slate-700 transition-colors">
+          Bypass
+        </button>
+        <button class="bg-slate-800 hover:bg-slate-700 text-slate-200 py-1.5 rounded text-[10px] font-bold border border-slate-700 transition-colors">
+          Gain Match
+        </button>
+        <button class="bg-slate-800 hover:bg-slate-700 text-slate-300 py-1.5 rounded text-[10px] font-sans border border-slate-700">
+          Codec
+        </button>
+        <button class="bg-slate-800 hover:bg-slate-700 text-slate-300 py-1.5 rounded text-[10px] font-sans border border-slate-700">
+          Dither
+        </button>
+      </div>
+    </div>
+
+  </main>
+
+  <!-- JAVASCRIPT: WEB AUDIO DSP GRAPH & OZONE STUDIO LOGIC -->
+  <script>
+    // State Store for Ozone Parameters
+    const ozState = {
+      isBypassed: false,
+      activeModule: 'eq', // 'eq', 'imager', 'maximizer'
+      
+      // Module Actives
+      eqActive: true,
+      imagerActive: true,
+      maximizerActive: true,
+
+      // EQ Parameters
+      eqLowGain: 1.5,
+      eqMid1Gain: -1.0,
+      eqMid2Gain: 2.0,
+      eqHighGain: 1.8,
+
+      // Imager Band Widths
+      w1: 0,
+      w2: 15,
+      w3: 35,
+      w4: 50,
+
+      // Maximizer Parameters
+      maxGain: 5.4,
+      maxUpward: 2.0,
+      maxSoftClip: 15,
+      maxTransient: 25
+    };
+
+    // Web Audio Node Graph References
+    let audioCtx = null;
+    let sourceNode = null;
+    let inputAnalyser = null;
+    let eqLowFilter = null;
+    let eqMid1Filter = null;
+    let eqMid2Filter = null;
+    let eqHighFilter = null;
+    let maximizerBoostGain = null;
+    let maximizerCompressor = null;
+    let outputAnalyser = null;
+    let isPlaying = false;
+
+    // Web Audio Initialization
+    function initOzoneAudioEngine() {
+      if (audioCtx) return;
+
+      const AudioCtxClass = window.AudioContext || window.webkitAudioContext;
+      audioCtx = new AudioCtxClass();
+
+      // Input Analyser
+      inputAnalyser = audioCtx.createAnalyser();
+      inputAnalyser.fftSize = 2048;
+
+      // Dynamic EQ Filters
+      eqLowFilter = audioCtx.createBiquadFilter();
+      eqLowFilter.type = 'lowshelf';
+      eqLowFilter.frequency.value = 100;
+
+      eqMid1Filter = audioCtx.createBiquadFilter();
+      eqMid1Filter.type = 'peaking';
+      eqMid1Filter.frequency.value = 822;
+      eqMid1Filter.Q.value = 0.7;
+
+      eqMid2Filter = audioCtx.createBiquadFilter();
+      eqMid2Filter.type = 'peaking';
+      eqMid2Filter.frequency.value = 3200;
+      eqMid2Filter.Q.value = 1.2;
+
+      eqHighFilter = audioCtx.createBiquadFilter();
+      eqHighFilter.type = 'highshelf';
+      eqHighFilter.frequency.value = 10000;
+
+      // Maximizer Boost Gain
+      maximizerBoostGain = audioCtx.createGain();
+
+      // Brickwall Limiter Compressor
+      maximizerCompressor = audioCtx.createDynamicsCompressor();
+      maximizerCompressor.threshold.value = -0.1;
+      maximizerCompressor.knee.value = 0.0;
+      maximizerCompressor.ratio.value = 20.0;
+      maximizerCompressor.attack.value = 0.001;
+      maximizerCompressor.release.value = 0.05;
+
+      // Output Analyser
+      outputAnalyser = audioCtx.createAnalyser();
+      outputAnalyser.fftSize = 2048;
+
+      // Connect Signal Chain Graph:
+      // InputAnalyser -> EQ Low -> EQ Mid1 -> EQ Mid2 -> EQ High -> BoostGain -> Compressor -> OutputAnalyser -> Destination
+      inputAnalyser.connect(eqLowFilter);
+      eqLowFilter.connect(eqMid1Filter);
+      eqMid1Filter.connect(eqMid2Filter);
+      eqMid2Filter.connect(eqHighFilter);
+      eqHighFilter.connect(maximizerBoostGain);
+      maximizerBoostGain.connect(maximizerCompressor);
+      maximizerCompressor.connect(outputAnalyser);
+      outputAnalyser.connect(audioCtx.destination);
+
+      updateAudioGraphValues();
+    }
+
+    function updateAudioGraphValues() {
+      if (!audioCtx) return;
+      const now = audioCtx.currentTime;
+
+      eqLowFilter.gain.setTargetAtTime(ozState.eqActive ? ozState.eqLowGain : 0, now, 0.01);
+      eqMid1Filter.gain.setTargetAtTime(ozState.eqActive ? ozState.eqMid1Gain : 0, now, 0.01);
+      eqMid2Filter.gain.setTargetAtTime(ozState.eqActive ? ozState.eqMid2Gain : 0, now, 0.01);
+      eqHighFilter.gain.setTargetAtTime(ozState.eqActive ? ozState.eqHighGain : 0, now, 0.01);
+
+      const boostLinear = ozState.maximizerActive ? Math.pow(10, ozState.maxGain / 20) : 1.0;
+      maximizerBoostGain.gain.setTargetAtTime(boostLinear, now, 0.01);
+    }
+
+    // Synthesize EDM / Pop Reference Audio Loop
+    function startAudioDemo() {
+      initOzoneAudioEngine();
+      if (audioCtx.state === 'suspended') audioCtx.resume();
+      stopAudioDemo();
+
+      const sampleRate = audioCtx.sampleRate;
+      const bufferSize = sampleRate * 4; // 4 second loop
+      const buffer = audioCtx.createBuffer(2, bufferSize, sampleRate);
+      const left = buffer.getChannelData(0);
+      const right = buffer.getChannelData(1);
+
+      for (let i = 0; i < bufferSize; i++) {
+        const t = i / sampleRate;
+        // Kick Drum
+        const kickEnv = Math.max(0, 1 - (t % 0.5) * 8);
+        const kick = Math.sin(2 * Math.PI * (55 * Math.exp(-(t % 0.5) * 18))) * kickEnv;
+
+        // Snare / Claps
+        const snareEnv = Math.max(0, 1 - ((t + 0.25) % 0.5) * 6);
+        const snare = (Math.random() * 2 - 1) * snareEnv * 0.3;
+
+        // EDM Chords (C min, Ab, Eb, Bb)
+        const synth = (Math.sin(2 * Math.PI * 261.63 * t) + Math.sin(2 * Math.PI * 311.13 * t) + Math.sin(2 * Math.PI * 392.0 * t)) * 0.12;
+
+        left[i] = kick * 0.6 + snare + synth;
+        right[i] = kick * 0.6 + snare * 0.9 + synth * 0.95;
+      }
+
+      sourceNode = audioCtx.createBufferSource();
+      sourceNode.buffer = buffer;
+      sourceNode.loop = true;
+      sourceNode.connect(inputAnalyser);
+      sourceNode.start();
+
+      isPlaying = true;
+      document.getElementById('playAudioBtn').innerHTML = '<i class="fa-solid fa-pause text-[10px]"></i> <span>Pause Reference</span>';
+    }
+
+    function stopAudioDemo() {
+      if (sourceNode) {
+        try { sourceNode.stop(); } catch(e){}
+        sourceNode.disconnect();
+        sourceNode = null;
+      }
+      isPlaying = false;
+      document.getElementById('playAudioBtn').innerHTML = '<i class="fa-solid fa-play text-[10px]"></i> <span>Play Reference Loop</span>';
+    }
+
+    // Canvas Render Loops
+    function startCanvasRenderers() {
+      const eqCanvas = document.getElementById('eqCanvas');
+      const imagerCanvas = document.getElementById('imagerCanvas');
+      const inMeterCanvas = document.getElementById('inMeterCanvas');
+      const outMeterCanvas = document.getElementById('outMeterCanvas');
+
+      const eqCtx = eqCanvas.getContext('2d');
+      const imagerCtx = imagerCanvas.getContext('2d');
+      const inCtx = inMeterCanvas.getContext('2d');
+      const outCtx = outMeterCanvas.getContext('2d');
+
+      function resizeAll() {
+        eqCanvas.width = eqCanvas.clientWidth;
+        eqCanvas.height = eqCanvas.clientHeight;
+        imagerCanvas.width = imagerCanvas.clientWidth;
+        imagerCanvas.height = imagerCanvas.clientHeight;
+        inMeterCanvas.width = inMeterCanvas.clientWidth;
+        inMeterCanvas.height = inMeterCanvas.clientHeight;
+        outMeterCanvas.width = outMeterCanvas.clientWidth;
+        outMeterCanvas.height = outMeterCanvas.clientHeight;
+      }
+      resizeAll();
+      window.addEventListener('resize', resizeAll);
+
+      const fftData = new Uint8Array(1024);
+
+      function renderFrame() {
+        requestAnimationFrame(renderFrame);
+
+        // -------------------------------------------------------------
+        // 1. RENDER DYNAMIC EQ & SPECTRUM
+        // -------------------------------------------------------------
+        const w = eqCanvas.width;
+        const h = eqCanvas.height;
+        eqCtx.clearRect(0, 0, w, h);
+
+        // Draw Ozone-style Frequency Grid Lines
+        eqCtx.strokeStyle = 'rgba(51, 65, 85, 0.3)';
+        eqCtx.lineWidth = 1;
+        eqCtx.font = '9px JetBrains Mono';
+        eqCtx.fillStyle = '#475569';
+
+        const freqs = [20, 50, 100, 200, 500, 1000, 2000, 5000, 10000, 20000];
+        freqs.forEach(f => {
+          const x = (Math.log10(f / 20) / Math.log10(20000 / 20)) * w;
+          eqCtx.beginPath();
+          eqCtx.moveTo(x, 0);
+          eqCtx.lineTo(x, h);
+          eqCtx.stroke();
+          if (f >= 1000) eqCtx.fillText(`${f/1000}k`, x + 3, h - 6);
+          else eqCtx.fillText(`${f}`, x + 3, h - 6);
+        });
+
+        // Draw FFT Spectrum Fill
+        if (outputAnalyser && isPlaying) {
+          outputAnalyser.getByteFrequencyData(fftData);
+          eqCtx.fillStyle = 'rgba(56, 189, 248, 0.15)';
+          const barWidth = w / 128;
+          for (let i = 0; i < 128; i++) {
+            const val = fftData[i * 4] / 255;
+            const barHeight = val * h;
+            eqCtx.fillRect(i * barWidth, h - barHeight, barWidth - 1, barHeight);
+          }
+        }
+
+        // Draw Composite EQ Response Curve
+        eqCtx.strokeStyle = '#38bdf8';
+        eqCtx.lineWidth = 2.5;
+        eqCtx.beginPath();
+
+        for (let x = 0; x < w; x++) {
+          const freq = 20 * Math.pow(20000 / 20, x / w);
+          let gainDb = 0;
+
+          if (ozState.eqActive) {
+            // Low Shelf
+            gainDb += ozState.eqLowGain / (1 + Math.pow(freq / 100, 2));
+            // Mid 1 Bell
+            gainDb += ozState.eqMid1Gain * Math.exp(-Math.pow(Math.log(freq / 822), 2) * 2);
+            // Mid 2 Bell
+            gainDb += ozState.eqMid2Gain * Math.exp(-Math.pow(Math.log(freq / 3200), 2) * 2);
+            // High Shelf
+            gainDb += ozState.eqHighGain / (1 + Math.pow(10000 / freq, 2));
+          }
+
+          const y = h / 2 - (gainDb / 18) * (h / 2);
+          if (x === 0) eqCtx.moveTo(x, y);
+          else eqCtx.lineTo(x, y);
+        }
+        eqCtx.stroke();
+
+        // -------------------------------------------------------------
+        // 2. RENDER IMAGER POLAR VECTORSCOPE
+        // -------------------------------------------------------------
+        const iw = imagerCanvas.width;
+        const ih = imagerCanvas.height;
+        imagerCtx.clearRect(0, 0, iw, ih);
+
+        // Scope Polar Circle Guides
+        imagerCtx.strokeStyle = 'rgba(51, 65, 85, 0.4)';
+        imagerCtx.lineWidth = 1;
+        imagerCtx.beginPath();
+        imagerCtx.arc(iw / 2, ih / 2, ih / 3, 0, Math.PI * 2);
+        imagerCtx.stroke();
+
+        // Scope Dynamic Stereo Dots Animation
+        if (isPlaying) {
+          imagerCtx.fillStyle = '#38bdf8';
+          for (let i = 0; i < 40; i++) {
+            const angle = (Math.random() - 0.5) * (Math.PI / 2) + (-Math.PI / 2);
+            const radius = (Math.random() * (ih / 3.2));
+            const x = iw / 2 + Math.cos(angle) * radius * (1 + ozState.w3 / 100);
+            const y = ih / 2 + Math.sin(angle) * radius;
+            imagerCtx.fillRect(x, y, 2, 2);
+          }
+        }
+
+        // -------------------------------------------------------------
+        // 3. RENDER I/O STEREO METER TOWERS
+        // -------------------------------------------------------------
+        renderMeterBar(inCtx, inMeterCanvas.width, inMeterCanvas.height, isPlaying ? 0.55 : 0.05, 'inPeakText');
+        renderMeterBar(outCtx, outMeterCanvas.width, outMeterCanvas.height, isPlaying ? 0.85 : 0.05, 'outPeakText');
+      }
+
+      function renderMeterBar(ctx, w, h, level, textId) {
+        ctx.clearRect(0, 0, w, h);
+        const barH = level * h;
+
+        const grad = ctx.createLinearGradient(0, h, 0, 0);
+        grad.addColorStop(0, '#38bdf8');
+        grad.addColorStop(0.7, '#f59e0b');
+        grad.addColorStop(1, '#ef4444');
+
+        ctx.fillStyle = grad;
+        ctx.fillRect(2, h - barH, w - 4, barH);
+
+        const dbVal = (20 * Math.log10(level)).toFixed(1);
+        document.getElementById(textId).innerText = isPlaying ? `${dbVal} dB` : '-inf dB';
+      }
+
+      renderFrame();
+    }
+
+    // Rotary Knob Drag Interactions
+    function setupKnobs() {
+      document.querySelectorAll('.knob-container').forEach(knob => {
+        let isDragging = false;
+        let startY = 0;
+        let startVal = parseFloat(knob.dataset.value);
+
+        const param = knob.dataset.param;
+        const min = parseFloat(knob.dataset.min);
+        const max = parseFloat(knob.dataset.max);
+        const unit = knob.dataset.unit || '';
+
+        const dial = knob.querySelector('.knob-dial');
+        const valText = knob.parentElement.querySelector('.knob-val');
+
+        function updateUI(val) {
+          const pct = (val - min) / (max - min);
+          const angle = -135 + pct * 270;
+          dial.style.transform = `rotate(${angle}deg)`;
+
+          if (valText) {
+            valText.innerText = `${val > 0 && unit==='dB' ? '+' : ''}${val.toFixed(1)} ${unit}`;
+          }
+
+          ozState[param] = val;
+          updateAudioGraphValues();
+        }
+
+        updateUI(startVal);
+
+        knob.addEventListener('pointerdown', e => {
+          isDragging = true;
+          startY = e.clientY;
+          startVal = ozState[param];
+          knob.setPointerCapture(e.pointerId);
+        });
+
+        knob.addEventListener('pointermove', e => {
+          if (!isDragging) return;
+          const deltaY = startY - e.clientY;
+          const range = max - min;
+          let newVal = startVal + (deltaY / 100) * range;
+          newVal = Math.min(max, Math.max(min, newVal));
+          updateUI(newVal);
+        });
+
+        knob.addEventListener('pointerup', e => {
+          isDragging = false;
+          knob.releasePointerCapture(e.pointerId);
+        });
+      });
+    }
+
+    // Module Switcher Navigation Logic
+    function setupModuleNavigation() {
+      const cardEq = document.getElementById('cardDynamicEq');
+      const cardImager = document.getElementById('cardImager');
+      const cardMaximizer = document.getElementById('cardMaximizer');
+
+      const viewEq = document.getElementById('viewDynamicEq');
+      const viewImager = document.getElementById('viewImager');
+      const viewMaximizer = document.getElementById('viewMaximizer');
+
+      function switchModule(activeCard, activeView, name) {
+        [cardEq, cardImager, cardMaximizer].forEach(c => c.classList.remove('oz-card-active'));
+        [viewEq, viewImager, viewMaximizer].forEach(v => v.classList.add('hidden'));
+
+        activeCard.classList.add('oz-card-active');
+        activeView.classList.remove('hidden');
+        ozState.activeModule = name;
+      }
+
+      cardEq.addEventListener('click', () => switchModule(cardEq, viewEq, 'eq'));
+      cardImager.addEventListener('click', () => switchModule(cardImager, viewImager, 'imager'));
+      cardMaximizer.addEventListener('click', () => switchModule(cardMaximizer, viewMaximizer, 'maximizer'));
+    }
+
+    // DOM Load Init
+    window.addEventListener('load', () => {
+      document.getElementById('playAudioBtn').addEventListener('click', () => {
+        if (isPlaying) stopAudioDemo();
+        else startAudioDemo();
+      });
+
+      document.getElementById('stopAudioBtn').addEventListener('click', stopAudioDemo);
+
+      setupKnobs();
+      setupModuleNavigation();
+      startCanvasRenderers();
+    });
+  </script>
+</body>
+</html>
+
+```
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index 619be3b..8ca30f5 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8,7 +8,41 @@
       "dependencies": {
         "@babel/cli": "^8.0.4",
         "@babel/core": "^8.0.1",
-        "@babel/preset-react": "^8.0.1"
+        "@babel/preset-react": "^8.0.1",
+        "jsdom": "^30.0.1",
+        "react": "^19.2.8",
+        "react-dom": "^19.2.8"
+      }
+    },
+    "node_modules/@asamuzakjp/css-color": {
+      "version": "6.0.5",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/css-color/-/css-color-6.0.5.tgz",
+      "integrity": "sha512-mbhpPMmnw/kwW19aRNmSUl1QzLbdGo1SCuE49BT98MNwqF6zaHb3o2owssFc/PEO/4t2UjqtCNwocuDtJornzA==",
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/css-calc": "^3.2.1",
+        "@csstools/css-color-parser": "^4.1.9",
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
+      }
+    },
+    "node_modules/@asamuzakjp/dom-selector": {
+      "version": "8.3.0",
+      "resolved": "https://registry.npmjs.org/@asamuzakjp/dom-selector/-/dom-selector-8.3.0.tgz",
+      "integrity": "sha512-UJLfKXBhrc8i1vH2eJXuYQMwlsLKWFw3O+CPqXSuVEiikeAim3UgrfWX0k4tA/X8cRFM8iZ7OaqBokFGbYusdg==",
+      "license": "MIT",
+      "dependencies": {
+        "bidi-js": "^1.0.3",
+        "css-tree": "^3.2.1",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2"
+      },
+      "engines": {
+        "node": "^22.13.0 || >=24.0.0"
       }
     },
     "node_modules/@babel/cli": {
@@ -366,6 +400,169 @@
         "node": "^22.18.0 || >=24.11.0"
       }
     },
+    "node_modules/@bramus/specificity": {
+      "version": "2.4.2",
+      "resolved": "https://registry.npmjs.org/@bramus/specificity/-/specificity-2.4.2.tgz",
+      "integrity": "sha512-ctxtJ/eA+t+6q2++vj5j7FYX3nRu311q1wfYH3xjlLOsczhlhxAg2FWNUXhpGvAw3BWo1xBcvOV6/YLc2r5FJw==",
+      "license": "MIT",
+      "dependencies": {
+        "css-tree": "^3.0.0"
+      },
+      "bin": {
+        "specificity": "bin/cli.js"
+      }
+    },
+    "node_modules/@csstools/color-helpers": {
+      "version": "6.1.0",
+      "resolved": "https://registry.npmjs.org/@csstools/color-helpers/-/color-helpers-6.1.0.tgz",
+      "integrity": "sha512-064IFJdjTfUqnjpCVpMOdbr8FLQBhinbZj6yRv2An2E41O/pLEXqfFRWqGq/SxlE5PEUYTlvWsG2r8MswAVvkg==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@csstools/css-calc": {
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-calc/-/css-calc-3.3.0.tgz",
+      "integrity": "sha512-c5ihYsPkdG6JCkU2zTMm4+k6r7RXuGxtWYhu5DHMIiF1FHzrfmHL5so11AoFpUv/tu61xfcmT4AmKoFfMPoqdQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-color-parser": {
+      "version": "4.1.10",
+      "resolved": "https://registry.npmjs.org/@csstools/css-color-parser/-/css-color-parser-4.1.10.tgz",
+      "integrity": "sha512-UZhQLIUyJaaMepqehrCODwCg2KW25vFvLWBmqYFaPclYvvxzj/sG8LBOhBFCp11i9uE7t1EyS+RAoV9tztPFyw==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "@csstools/color-helpers": "^6.1.0",
+        "@csstools/css-calc": "^3.3.0"
+      },
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-parser-algorithms": "^4.0.0",
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-parser-algorithms": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-parser-algorithms/-/css-parser-algorithms-4.0.0.tgz",
+      "integrity": "sha512-+B87qS7fIG3L5h3qwJ/IFbjoVoOe/bpOdh9hAjXbvx0o8ImEmUsGXN0inFOnk2ChCFgqkkGFQ+TpM5rbhkKe4w==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "peerDependencies": {
+        "@csstools/css-tokenizer": "^4.0.0"
+      }
+    },
+    "node_modules/@csstools/css-syntax-patches-for-csstree": {
+      "version": "1.1.7",
+      "resolved": "https://registry.npmjs.org/@csstools/css-syntax-patches-for-csstree/-/css-syntax-patches-for-csstree-1.1.7.tgz",
+      "integrity": "sha512-fQ+05118eQS1cofO3aJpB5efgpBZMvIzwr/sbC8kDLVA5XLG8q1kJV5yzrUAI1f7lvhPnm8fgIjzFB8/O/5Dig==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT-0",
+      "peerDependencies": {
+        "css-tree": "^3.2.1"
+      },
+      "peerDependenciesMeta": {
+        "css-tree": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/@csstools/css-tokenizer": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/@csstools/css-tokenizer/-/css-tokenizer-4.0.0.tgz",
+      "integrity": "sha512-QxULHAm7cNu72w97JUNCBFODFaXpbDg+dP8b/oWFAZ2MTRppA3U00Y2L1HqaS4J6yBqxwa/Y3nMBaxVKbB/NsA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/csstools"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/csstools"
+        }
+      ],
+      "license": "MIT",
+      "engines": {
+        "node": ">=20.19.0"
+      }
+    },
+    "node_modules/@exodus/bytes": {
+      "version": "1.15.1",
+      "resolved": "https://registry.npmjs.org/@exodus/bytes/-/bytes-1.15.1.tgz",
+      "integrity": "sha512-S6mL0yNB/Abt9Ei4tq8gDhcczc4S3+vQ4ra7vxnAf+YHC02srtqxKKZghx2Dq6p0e66THKwR6r8N6P95wEty7Q==",
+      "license": "MIT",
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      },
+      "peerDependencies": {
+        "@noble/hashes": "^1.8.0 || ^2.0.0"
+      },
+      "peerDependenciesMeta": {
+        "@noble/hashes": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -434,6 +631,15 @@
         "node": ">=6.0.0"
       }
     },
+    "node_modules/bidi-js": {
+      "version": "1.0.3",
+      "resolved": "https://registry.npmjs.org/bidi-js/-/bidi-js-1.0.3.tgz",
+      "integrity": "sha512-RKshQI1R3YQ+n9YJz2QQ147P66ELpa1FQEg20Dk8oW9t2KgLbpDLLp9aGZ7y8WHSshDknG0bknqGw5/tyCs5tw==",
+      "license": "MIT",
+      "dependencies": {
+        "require-from-string": "^2.0.2"
+      }
+    },
     "node_modules/brace-expansion": {
       "version": "5.0.7",
       "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-5.0.7.tgz",
@@ -529,6 +735,52 @@
       "integrity": "sha512-Kvp459HrV2FEJ1CAsi1Ku+MY3kasH19TFykTz2xWmMeq6bk2NU3XXvfJ+Q61m0xktWwt+1HSYf3JZsTms3aRJg==",
       "license": "MIT"
     },
+    "node_modules/css-tree": {
+      "version": "3.2.1",
+      "resolved": "https://registry.npmjs.org/css-tree/-/css-tree-3.2.1.tgz",
+      "integrity": "sha512-X7sjQzceUhu1u7Y/ylrRZFU2FS6LRiFVp6rKLPg23y3x3c3DOKAwuXGDp+PAGjh6CSnCjYeAul8pcT8bAl+lSA==",
+      "license": "MIT",
+      "dependencies": {
+        "mdn-data": "2.27.1",
+        "source-map-js": "^1.2.1"
+      },
+      "engines": {
+        "node": "^10 || ^12.20.0 || ^14.13.0 || >=15.0.0"
+      }
+    },
+    "node_modules/data-urls": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/data-urls/-/data-urls-7.0.0.tgz",
+      "integrity": "sha512-23XHcCF+coGYevirZceTVD7NdJOqVn+49IHyxgszm+JIiHLoB2TkmPtsYkNWT1pvRSGkc35L6NHs0yHkN2SumA==",
+      "license": "MIT",
+      "dependencies": {
+        "whatwg-mimetype": "^5.0.0",
+        "whatwg-url": "^16.0.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/data-urls/node_modules/whatwg-url": {
+      "version": "16.0.1",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-16.0.1.tgz",
+      "integrity": "sha512-1to4zXBxmXHV3IiSSEInrreIlu02vUOvrhxJJH5vcxYTBDAx51cqZiKdyTxlecdKNSjj8EcxGBxNf6Vg+945gw==",
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.11.0",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
+    "node_modules/decimal.js": {
+      "version": "10.6.0",
+      "resolved": "https://registry.npmjs.org/decimal.js/-/decimal.js-10.6.0.tgz",
+      "integrity": "sha512-YpgQiITW3JXGntzdUmyUR1V812Hn8T1YVXhCu+wO3OpS4eU9l4YdD3qjyiKdV6mvV29zapkMeD390UVEf2lkUg==",
+      "license": "MIT"
+    },
     "node_modules/electron-to-chromium": {
       "version": "1.5.393",
       "resolved": "https://registry.npmjs.org/electron-to-chromium/-/electron-to-chromium-1.5.393.tgz",
@@ -544,6 +796,18 @@
         "node": ">=14"
       }
     },
+    "node_modules/entities": {
+      "version": "8.0.0",
+      "resolved": "https://registry.npmjs.org/entities/-/entities-8.0.0.tgz",
+      "integrity": "sha512-zwfzJecQ/Uej6tusMqwAqU/6KL2XaB2VZ2Jg54Je6ahNBGNH6Ek6g3jjNCF0fG9EWQKGZNddNjU5F1ZQn/sBnA==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20.19.0"
+      },
+      "funding": {
+        "url": "https://github.com/fb55/entities?sponsor=1"
+      }
+    },
     "node_modules/escalade": {
       "version": "3.2.0",
       "resolved": "https://registry.npmjs.org/escalade/-/escalade-3.2.0.tgz",
@@ -579,6 +843,18 @@
         "url": "https://github.com/sponsors/isaacs"
       }
     },
+    "node_modules/html-encoding-sniffer": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-6.0.0.tgz",
+      "integrity": "sha512-CV9TW3Y3f8/wT0BRFc1/KAVQ3TUHiXmaAb6VW9vtiMFf7SLoMd1PdAc4W3KFOFETBJUb90KatHqlsZMWV+R9Gg==",
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.6.0"
+      },
+      "engines": {
+        "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
+      }
+    },
     "node_modules/import-meta-resolve": {
       "version": "4.2.0",
       "resolved": "https://registry.npmjs.org/import-meta-resolve/-/import-meta-resolve-4.2.0.tgz",
@@ -589,12 +865,58 @@
         "url": "https://github.com/sponsors/wooorm"
       }
     },
+    "node_modules/is-potential-custom-element-name": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/is-potential-custom-element-name/-/is-potential-custom-element-name-1.0.1.tgz",
+      "integrity": "sha512-bCYeRA2rVibKZd+s2625gGnGF/t7DSqDs4dP7CrLA1m7jKWz6pps0LpYLJN8Q64HtmPKJ1hrN3nzPNKFEKOUiQ==",
+      "license": "MIT"
+    },
     "node_modules/js-tokens": {
       "version": "10.0.0",
       "resolved": "https://registry.npmjs.org/js-tokens/-/js-tokens-10.0.0.tgz",
       "integrity": "sha512-lM/UBzQmfJRo9ABXbPWemivdCW8V2G8FHaHdypQaIy523snUjog0W71ayWXTjiR+ixeMyVHN2XcpnTd/liPg/Q==",
       "license": "MIT"
     },
+    "node_modules/jsdom": {
+      "version": "30.0.1",
+      "resolved": "https://registry.npmjs.org/jsdom/-/jsdom-30.0.1.tgz",
+      "integrity": "sha512-52v7mUVUfNQVYYqE1lcdaymWL0njO7lTLUog6ZvW2U5KsbiLk/GnZlVJ+qx0xfNJZ6Gn+KSpPNE52vurbxZwrA==",
+      "license": "MIT",
+      "dependencies": {
+        "@asamuzakjp/css-color": "^6.0.5",
+        "@asamuzakjp/dom-selector": "^8.3.0",
+        "@bramus/specificity": "^2.4.2",
+        "@csstools/css-syntax-patches-for-csstree": "^1.1.7",
+        "@exodus/bytes": "^1.15.1",
+        "css-tree": "^3.2.1",
+        "data-urls": "^7.0.0",
+        "decimal.js": "^10.6.0",
+        "html-encoding-sniffer": "^6.0.0",
+        "is-potential-custom-element-name": "^1.0.1",
+        "lru-cache": "^11.5.2",
+        "parse5": "^8.0.1",
+        "saxes": "^6.0.0",
+        "symbol-tree": "^3.2.4",
+        "tough-cookie": "^6.0.2",
+        "undici": "^8.9.0",
+        "w3c-xmlserializer": "^5.0.0",
+        "webidl-conversions": "^8.0.1",
+        "whatwg-mimetype": "^5.0.0",
+        "whatwg-url": "^17.1.0",
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": "^22.22.2 || ^24.15.0 || >=26.0.0"
+      },
+      "peerDependencies": {
+        "canvas": "^3.2.3"
+      },
+      "peerDependenciesMeta": {
+        "canvas": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/jsesc": {
       "version": "3.1.0",
       "resolved": "https://registry.npmjs.org/jsesc/-/jsesc-3.1.0.tgz",
@@ -628,6 +950,12 @@
         "node": "20 || >=22"
       }
     },
+    "node_modules/mdn-data": {
+      "version": "2.27.1",
+      "resolved": "https://registry.npmjs.org/mdn-data/-/mdn-data-2.27.1.tgz",
+      "integrity": "sha512-9Yubnt3e8A0OKwxYSXyhLymGW4sCufcLG6VdiDdUGVkPhpqLxlvP5vl1983gQjJl3tqbrM731mjaZaP68AgosQ==",
+      "license": "CC0-1.0"
+    },
     "node_modules/minimatch": {
       "version": "10.2.5",
       "resolved": "https://registry.npmjs.org/minimatch/-/minimatch-10.2.5.tgz",
@@ -674,6 +1002,18 @@
         "node": ">=12.20.0"
       }
     },
+    "node_modules/parse5": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/parse5/-/parse5-8.0.1.tgz",
+      "integrity": "sha512-z1e/HMG90obSGeidlli3hj7cbocou0/wa5HacvI3ASx34PecNjNQeaHNo5WIZpWofN9kgkqV1q5YvXe3F0FoPw==",
+      "license": "MIT",
+      "dependencies": {
+        "entities": "^8.0.0"
+      },
+      "funding": {
+        "url": "https://github.com/inikulin/parse5?sponsor=1"
+      }
+    },
     "node_modules/path-scurry": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/path-scurry/-/path-scurry-2.0.2.tgz",
@@ -696,6 +1036,36 @@
       "integrity": "sha512-xceH2snhtb5M9liqDsmEw56le376mTZkEX/jEb/RxNFyegNul7eNslCXP9FDj/Lcu0X8KEyMceP2ntpaHrDEVA==",
       "license": "ISC"
     },
+    "node_modules/punycode": {
+      "version": "2.3.1",
+      "resolved": "https://registry.npmjs.org/punycode/-/punycode-2.3.1.tgz",
+      "integrity": "sha512-vYt7UD1U9Wg6138shLtLOvdAu+8DsC/ilFtEVHcH+wydcSpNE20AfSOduf6MkRFahL5FY7X1oU7nKVZFtfq8Fg==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/react": {
+      "version": "19.2.8",
+      "resolved": "https://registry.npmjs.org/react/-/react-19.2.8.tgz",
+      "integrity": "sha512-PWaYA1L/q9u2u7xYQi+Y3L3Yfnie7XyLeaJICV1MGD6LprsBxcAqGjYyr0eY3p+QdsA+x/Irkt4Qif8D63+Sbw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/react-dom": {
+      "version": "19.2.8",
+      "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-19.2.8.tgz",
+      "integrity": "sha512-rVprimfGBG3DR+Tq0IQG2DT5PxKth1WIGDmj5yPmlzr4YBe7uyE+Du4oVqTDXZSHGGGXRtTJEGSSePyQCMBglQ==",
+      "license": "MIT",
+      "dependencies": {
+        "scheduler": "^0.27.0"
+      },
+      "peerDependencies": {
+        "react": "^19.2.8"
+      }
+    },
     "node_modules/readdirp": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-5.0.0.tgz",
@@ -709,6 +1079,33 @@
         "url": "https://paulmillr.com/funding/"
       }
     },
+    "node_modules/require-from-string": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/require-from-string/-/require-from-string-2.0.2.tgz",
+      "integrity": "sha512-Xf0nWe6RseziFMu+Ap9biiUbmplq6S9/p+7w7YXP/JBHhrUDDUhwa+vANyubuqfZWTveU//DYVGsDG7RKL/vEw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/saxes": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/saxes/-/saxes-6.0.0.tgz",
+      "integrity": "sha512-xAg7SOnEhrm5zI3puOOKyy1OMcMlIJZYNJY7xLBwSze0UjhPLnWfj2GF2EpT0jmzaJKIWKHLsaSSajf35bcYnA==",
+      "license": "ISC",
+      "dependencies": {
+        "xmlchars": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=v12.22.7"
+      }
+    },
+    "node_modules/scheduler": {
+      "version": "0.27.0",
+      "resolved": "https://registry.npmjs.org/scheduler/-/scheduler-0.27.0.tgz",
+      "integrity": "sha512-eNv+WrVbKu1f3vbYJT/xtiF5syA5HPIMtf9IgY/nKg0sWqzAUEvqY/xm7OcZc/qafLx/iO9FgOmeSAp4v5ti/Q==",
+      "license": "MIT"
+    },
     "node_modules/semver": {
       "version": "7.8.5",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.8.5.tgz",
@@ -733,6 +1130,72 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/source-map-js": {
+      "version": "1.2.1",
+      "resolved": "https://registry.npmjs.org/source-map-js/-/source-map-js-1.2.1.tgz",
+      "integrity": "sha512-UXWMKhLOwVKb728IUtQPXxfYU+usdybtUrK/8uGE8CQMvrhOpwvzDBwj0QhSL7MQc7vIsISBG8VQ8+IDQxpfQA==",
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/symbol-tree": {
+      "version": "3.2.4",
+      "resolved": "https://registry.npmjs.org/symbol-tree/-/symbol-tree-3.2.4.tgz",
+      "integrity": "sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==",
+      "license": "MIT"
+    },
+    "node_modules/tldts": {
+      "version": "7.4.9",
+      "resolved": "https://registry.npmjs.org/tldts/-/tldts-7.4.9.tgz",
+      "integrity": "sha512-3kZ8wQQ/k5DrChD4X4FVvr2D7E5uoRgAqkPyLpSCGUvqOvqu+JEdr3mwMUaVWb+vMHZaKhF5fp2PBigKsui7hA==",
+      "license": "MIT",
+      "dependencies": {
+        "tldts-core": "^7.4.9"
+      },
+      "bin": {
+        "tldts": "bin/cli.js"
+      }
+    },
+    "node_modules/tldts-core": {
+      "version": "7.4.9",
+      "resolved": "https://registry.npmjs.org/tldts-core/-/tldts-core-7.4.9.tgz",
+      "integrity": "sha512-DxKfPBI52p2msTEu7MPhdpdDTBhhVQg1a/8PjQckeyAvO13eMYElX545grIp6nnTGIMZlRvFZPvFhvI/WIz2Vg==",
+      "license": "MIT"
+    },
+    "node_modules/tough-cookie": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/tough-cookie/-/tough-cookie-6.0.2.tgz",
+      "integrity": "sha512-exgYmnmL/sJpR3upZfXG5PoatXQii55xAiXGXzY+sROLZ/Y+SLcp9PgJNI9Vz37HpQ74WvDcLT8eqm+kV3FzrA==",
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "tldts": "^7.0.5"
+      },
+      "engines": {
+        "node": ">=16"
+      }
+    },
+    "node_modules/tr46": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/tr46/-/tr46-6.0.0.tgz",
+      "integrity": "sha512-bLVMLPtstlZ4iMQHpFHTR7GAGj2jxi8Dg0s2h2MafAE4uSWF98FC/3MomU51iQAMf8/qDUbKWf5GxuvvVcXEhw==",
+      "license": "MIT",
+      "dependencies": {
+        "punycode": "^2.3.1"
+      },
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/undici": {
+      "version": "8.9.0",
+      "resolved": "https://registry.npmjs.org/undici/-/undici-8.9.0.tgz",
+      "integrity": "sha512-aWZpUj7XoGonMClx4gdDRfgBjqeA+F473aDmROQQbM9n6PRfK/u1q/a0X4wMTgcHfT8H6fpbt98PFuDUwFg2YA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=22.19.0"
+      }
+    },
     "node_modules/update-browserslist-db": {
       "version": "1.2.3",
       "resolved": "https://registry.npmjs.org/update-browserslist-db/-/update-browserslist-db-1.2.3.tgz",
@@ -762,6 +1225,65 @@
       "peerDependencies": {
         "browserslist": ">= 4.21.0"
       }
+    },
+    "node_modules/w3c-xmlserializer": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/w3c-xmlserializer/-/w3c-xmlserializer-5.0.0.tgz",
+      "integrity": "sha512-o8qghlI8NZHU1lLPrpi2+Uq7abh4GGPpYANlalzWxyWteJOCsr/P+oPBA49TOLu5FTZO4d3F9MnWJfiMo4BkmA==",
+      "license": "MIT",
+      "dependencies": {
+        "xml-name-validator": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/webidl-conversions": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/webidl-conversions/-/webidl-conversions-8.0.1.tgz",
+      "integrity": "sha512-BMhLD/Sw+GbJC21C/UgyaZX41nPt8bUTg+jWyDeg7e7YN4xOM05YPSIXceACnXVtqyEw/LMClUQMtMZ+PGGpqQ==",
+      "license": "BSD-2-Clause",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-mimetype": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/whatwg-mimetype/-/whatwg-mimetype-5.0.0.tgz",
+      "integrity": "sha512-sXcNcHOC51uPGF0P/D4NVtrkjSU2fNsm9iog4ZvZJsL3rjoDAzXZhkm2MWt1y+PUdggKAYVoMAIYcs78wJ51Cw==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=20"
+      }
+    },
+    "node_modules/whatwg-url": {
+      "version": "17.1.0",
+      "resolved": "https://registry.npmjs.org/whatwg-url/-/whatwg-url-17.1.0.tgz",
+      "integrity": "sha512-3GeworPmc2ZfEEHP7lEbUfBX/L75wdEsi0rLNhXcXxnoN5jyq0SL5gCy06SGW2cyTIZdTvWIDQNQoza++vKeaw==",
+      "license": "MIT",
+      "dependencies": {
+        "@exodus/bytes": "^1.15.1",
+        "tr46": "^6.0.0",
+        "webidl-conversions": "^8.0.1"
+      },
+      "engines": {
+        "node": "^22.14.0 || >=24.0.0"
+      }
+    },
+    "node_modules/xml-name-validator": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/xml-name-validator/-/xml-name-validator-5.0.0.tgz",
+      "integrity": "sha512-EvGK8EJ3DhaHfbRlETOWAS5pO9MZITeauHKJyb8wyajUfQUenkIg2MvLDTZ4T/TgIcm3HU0TFBgWWboAZ30UHg==",
+      "license": "Apache-2.0",
+      "engines": {
+        "node": ">=18"
+      }
+    },
+    "node_modules/xmlchars": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/xmlchars/-/xmlchars-2.2.0.tgz",
+      "integrity": "sha512-JZnDKK8B0RCDw84FNdDAIpZK+JuJw+s7Lz8nksI7SIuU3UXJJslUthsi+uWBUYOwPFwW7W7PRLRfUKpxjtjFCw==",
+      "license": "MIT"
     }
   }
 }
diff --git a/package.json b/package.json
index b05cb88..8e408af 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,9 @@
   "dependencies": {
     "@babel/cli": "^8.0.4",
     "@babel/core": "^8.0.1",
-    "@babel/preset-react": "^8.0.1"
+    "@babel/preset-react": "^8.0.1",
+    "jsdom": "^30.0.1",
+    "react": "^19.2.8",
+    "react-dom": "^19.2.8"
   }
 }
diff --git a/tests/test_ai_scan_dsp.py b/tests/test_ai_scan_dsp.py
index 9baeb30..7b1c8fe 100644
--- a/tests/test_ai_scan_dsp.py
+++ b/tests/test_ai_scan_dsp.py
@@ -1,5 +1,9 @@
 import pytest
 import numpy as np
+import os
+import app.api.v1.user_config as user_config
+user_config.DATA_FILE = os.path.join(os.path.dirname(__file__), "user_configs_test.json")
+
 from fastapi.testclient import TestClient
 from app.main import app
 from app.core.ai_dsp_engine import AIDSPEngine