diff --git a/app/static/js/app.jsx b/app/static/js/app.jsx
index 2875f43..912fced 100644
--- a/app/static/js/app.jsx
+++ b/app/static/js/app.jsx
@@ -9071,6 +9071,10 @@ const MediaExplorerPanel = ({ height }) => {
   const [computerFiles, setComputerFiles] = React.useState([]);
   const [computerMode, setComputerMode] = React.useState('server');
   const [clientRoot, setClientRoot] = React.useState(null);
+  const [favorites, setFavorites] = React.useState(function() {
+    try { return JSON.parse(localStorage.getItem('studio_media_explorer_favorites_v1') || '[]'); } catch (e) { return []; }
+  }());
+  const [favContext, setFavContext] = React.useState(null);
   const [synthInst, setSynthInst] = React.useState(function() {
     var saved = localStorage.getItem('studio_media_explorer_synth');
     return saved ? JSON.parse(saved) : null;
@@ -9359,7 +9363,11 @@ const MediaExplorerPanel = ({ height }) => {
         setComputerPath('root');
         setComputerFiles([]);
         setComputerTree({ root: { handle, parent: null, dirs: [], expanded: true } });
-        await browseComputerDir(rootEntry);
+        const browsed = await browseComputerDir(rootEntry);
+        // Tự động load cấu trúc: expand từng thư mục con cấp 1 để hiển thị cây
+        if (browsed && browsed.dirs) {
+          browsed.dirs.slice(0, 10).forEach(d => browseComputerDir(d));
+        }
         return;
       } catch (e) {
         if (e && e.name === 'AbortError') return;
@@ -9386,7 +9394,7 @@ const MediaExplorerPanel = ({ height }) => {
 
   const browseClientDir = async (entry) => {
     const handle = entry && entry.handle;
-    if (!handle || !handle.entries) return;
+    if (!handle || !handle.entries) return null;
     const dirs = [];
     const files = [];
     const parentPath = entry.path;
@@ -9411,22 +9419,23 @@ const MediaExplorerPanel = ({ height }) => {
       setCurrentTime(0);
       stopMediaPlayback();
       setComputerTree(prev => ({ ...prev, [parentPath]: { handle, parent: entry.parent || null, dirs, expanded: true } }));
+      return { dirs, files };
     } catch (e) {
       window.showToast && window.showToast('Không thể đọc thư mục: ' + e.message, 'error');
+      return null;
     }
   };
 
   const browseComputerDir = async (entry) => {
-    if (!entry) return;
+    if (!entry) return null;
     if (computerMode === 'client' || entry.handle) {
       if (entry.handle && entry.handle.entries) {
         const parentInfo = computerTree[entry.path];
-        await browseClientDir({ ...entry, parent: parentInfo ? parentInfo.parent : null });
-        return;
+        return await browseClientDir({ ...entry, parent: parentInfo ? parentInfo.parent : null });
       }
     }
     const path = entry.path || entry;
-    if (!path) return;
+    if (!path) return null;
     try {
       const resp = await fetch(`${API_BASE_URL}/api/v1/media/browse?path=${encodeURIComponent(path)}`);
       if (!resp.ok) throw new Error('HTTP ' + resp.status);
@@ -9437,8 +9446,10 @@ const MediaExplorerPanel = ({ height }) => {
       setCurrentTime(0);
       stopMediaPlayback();
       setComputerTree(prev => ({ ...prev, [path]: { dirs: data.dirs || [], expanded: true } }));
+      return { dirs: data.dirs || [], files: data.files || [] };
     } catch (e) {
       window.showToast && window.showToast('Không thể mở thư mục: ' + e.message, 'error');
+      return null;
     }
   };
 
@@ -9446,15 +9457,64 @@ const MediaExplorerPanel = ({ height }) => {
     if (!entry) return;
     const path = entry.path || entry;
     const node = computerTree[path];
-    if (node && node.expanded) {
-      setComputerTree(prev => ({ ...prev, [path]: { ...prev[path], expanded: false } }));
+    if (node && node.expanded) {      setComputerTree(prev => ({ ...prev, [path]: { ...prev[path], expanded: false } }));
     } else {
       await browseComputerDir(entry);
     }
   };
 
-  const goComputerParent = () => {
-    if (!computerPath) return;
+  // ── Favorites: thư mục yêu thích ──
+  const isFavorite = (entry) => {
+    if (!entry) return false;
+    return (favorites || []).some(f => f.path === (entry.path || entry));
+  };
+  const toggleFavorite = (entry, e) => {
+    if (e && e.stopPropagation) e.stopPropagation();
+    if (!entry) return;
+    const path = entry.path || entry;
+    const name = entry.name || path.split('/').pop() || path;
+    setFavorites(prev => {
+      const exists = prev.some(f => f.path === path);
+      const next = exists ? prev.filter(f => f.path !== path) : [...prev, { path, name, is_dir: true }];
+      try { localStorage.setItem('studio_media_explorer_favorites_v1', JSON.stringify(next)); } catch (e2) {}
+      return next;
+    });
+    window.showToast && window.showToast('Đã ' + (isFavorite(entry) ? 'gỡ khỏi' : 'thêm vào') + ' Favorites: ' + name, 'info');
+  };
+  const openFavorite = (fav) => {
+    if (!fav) return;
+    setFolder('computer');
+    const entry = { path: fav.path, name: fav.name, is_dir: true };
+    // Cố gắng tìm handle trong cây đã load để mở trực tiếp
+    const node = computerTree[fav.path];
+    if (node && node.handle) {
+      browseComputerDir({ ...entry, handle: node.handle });
+    } else if (fav.path === 'root' && clientRoot) {
+      browseComputerDir({ name: clientRoot.name, path: 'root', is_dir: true, handle: clientRoot });
+    } else if (fav.path && fav.path.startsWith('root/') && clientRoot) {
+      // Duyệt lại từ root handle tới folder favorite
+      const segments = fav.path.split('/').slice(1);
+      let curHandle = clientRoot;
+      const walk = async (idx) => {
+        if (idx >= segments.length) {
+          browseComputerDir({ name: segments[idx - 1] || clientRoot.name, path: fav.path, is_dir: true, handle: curHandle });
+          return;
+        }
+        try {
+          const child = await curHandle.getDirectoryHandle(segments[idx]);
+          curHandle = child;
+          walk(idx + 1);
+        } catch (e) {
+          window.showToast && window.showToast('Không mở được thư mục favorite', 'error');
+        }
+      };
+      walk(0);
+    } else if (fav.path) {
+      browseComputerDir(entry);
+    }
+  };
+
+  const goComputerParent = () => {    if (!computerPath) return;
     if (computerMode === 'client' || clientRoot) {
       const node = computerTree[computerPath];
       const parentHandle = node && node.parent;
@@ -9831,15 +9891,18 @@ const MediaExplorerPanel = ({ height }) => {
     const expanded = node && node.expanded;
     const dirs = node ? node.dirs : [];
     const pad = 12 + depth * 12;
+    const fav = isFavorite(entry);
     return (
       <React.Fragment key={nodePath}>
         <div className={`flex items-center gap-1 px-1 py-0.5 cursor-pointer rounded-sm ${computerPath === nodePath ? 'bg-slate-300 text-slate-900' : 'hover:bg-slate-200 text-slate-800'}`}
           style={{ paddingLeft: pad }}
           onClick={() => browseComputerDir(entry)}
-          onDoubleClick={e => { e.stopPropagation(); toggleComputerDir(entry); }}>
+          onDoubleClick={e => { e.stopPropagation(); toggleComputerDir(entry); }}
+          onContextMenu={e => { e.preventDefault(); e.stopPropagation(); setFavContext(Object.assign({}, entry, { x: e.clientX, y: e.clientY })); }}>
           <i className={`fa-solid ${expanded ? 'fa-minus' : 'fa-plus'} text-[9px] text-slate-500 w-3 text-center shrink-0`} onClick={e => { e.stopPropagation(); toggleComputerDir(entry); }}></i>
           <i className={`fa-solid ${isRoot ? 'fa-hard-drive text-[#6ea8dc]' : 'fa-folder text-[#d9a752]'} shrink-0`}></i>
-          <span className="truncate">{entry.name}</span>
+          <span className="truncate flex-1">{entry.name}</span>
+          {fav && <i className="fa-solid fa-star text-amber-500 text-[9px] shrink-0"></i>}
         </div>
         {expanded && dirs.map(d => renderComputerNode(d, depth + 1, false))}
       </React.Fragment>
@@ -9906,7 +9969,7 @@ const MediaExplorerPanel = ({ height }) => {
       </div>
 
       {/* 2. MIDDLE SPLIT VIEW */}
-      <div className="flex-1 flex overflow-hidden min-h-0">
+      <div className="flex-1 flex overflow-hidden min-h-0 relative">
         {/* DIRECTORY TREE */}
         <div className="flex bg-white border border-[#808080] m-1 mr-0 text-xs select-none shrink-0 overflow-hidden">
           <div className="overflow-y-auto p-1" style={{ width: treeWidth + 'px', minWidth: treeWidth + 'px', maxWidth: treeWidth + 'px' }}>
@@ -9916,6 +9979,24 @@ const MediaExplorerPanel = ({ height }) => {
             <div className={`flex items-center gap-1 px-1 py-0.5 cursor-pointer rounded-sm ${folder === 'computer' ? 'bg-slate-300 text-slate-900 font-semibold' : 'hover:bg-slate-200 text-slate-800'}`} onClick={openMyComputer}>
               <i className="fa-solid fa-computer text-[11px] text-slate-600"></i> My Computer
             </div>
+            {favorites && favorites.length > 0 && (
+              <div className="pl-3 space-y-0.5">
+                <div className="flex items-center gap-1 px-1 py-0.5 font-semibold text-amber-700 rounded-sm">
+                  <i className="fa-solid fa-star text-amber-500 text-[10px]"></i> Favorites
+                </div>
+                {favorites.map((fav, fi) => (
+                  <div key={fav.path + fi}
+                    className="flex items-center gap-1 px-1 py-0.5 cursor-pointer pl-4 rounded-sm hover:bg-amber-100 text-slate-800"
+                    style={{ paddingLeft: 24 }}
+                    onClick={() => openFavorite(fav)}
+                    onContextMenu={e => { e.preventDefault(); e.stopPropagation(); setFavContext(Object.assign({}, fav, { x: e.clientX, y: e.clientY })); }}>
+                    <i className="fa-solid fa-folder text-[#d9a752] shrink-0"></i>
+                    <span className="truncate flex-1">{fav.name}</span>
+                    <i className="fa-solid fa-star text-amber-500 text-[9px] shrink-0"></i>
+                  </div>
+                ))}
+              </div>
+            )}
             {folder === 'computer' && computerRoots && (
               <div className="pl-3 space-y-0.5">
                 {computerRoots.map(root => renderComputerNode(root, 0, true))}
@@ -9941,6 +10022,22 @@ const MediaExplorerPanel = ({ height }) => {
             title="Kéo để thay đổi chiều rộng"></div>
         </div>
 
+        {/* CONTEXT MENU (right-click folder → Favorite) */}
+        {favContext && (
+          <div className="fixed z-[100] bg-white border border-[#808080] shadow-lg rounded-sm text-xs font-sans text-slate-800 min-w-[180px]"
+            style={{ left: favContext.x, top: favContext.y }}
+            onMouseLeave={() => setFavContext(null)}>
+            <div className={`px-2 py-1 cursor-pointer hover:bg-blue-100 flex items-center gap-1.5 ${isFavorite(favContext) ? 'text-amber-700' : ''}`}
+              onClick={() => { toggleFavorite(favContext); setFavContext(null); }}>
+              <i className={`fa-solid ${isFavorite(favContext) ? 'fa-star text-amber-500' : 'fa-star text-slate-400'} text-[11px]`}></i>
+              {isFavorite(favContext) ? 'Gỡ khỏi Favorites' : 'Thêm vào Favorites'}
+            </div>
+            <div className="px-2 py-1 cursor-pointer hover:bg-blue-100 flex items-center gap-1.5" onClick={() => { if (favContext) browseComputerDir(favContext); setFavContext(null); }}>
+              <i className="fa-solid fa-folder-open text-[#d9a752] text-[11px]"></i> Mở thư mục
+            </div>
+          </div>
+        )}
+
         {/* FILE LIST */}
         <div className="flex-1 bg-white border border-[#808080] m-1 overflow-y-auto relative">
           <table className="w-full text-xs text-left border-collapse">
diff --git a/app/static/js/app.precompiled.js b/app/static/js/app.precompiled.js
index 6e189dc..99f5cd0 100644
--- a/app/static/js/app.precompiled.js
+++ b/app/static/js/app.precompiled.js
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(1k-6kHz)',color:'#a855f7',val:ozState.w3},{id:'w4',label:'Band 4 (6k-20kHz)',color:'#34d399',val:ozState.w4}].map(b=>/*#__PURE__*/React.createElement("div",{key:b.id},/*#__PURE__*/React.createElement("div",{className:"flex justify-between text-[11px] font-mono mb-1"},/*#__PURE__*/React.createElement("span",{style:{color:b.color,fontWeight:700}},b.label),/*#__PURE__*/React.createElement("span",{id:b.id+'Val'},b.val,"%")),/*#__PURE__*/React.createElement("input",{type:"range",min:"-100",max:"100",value:b.val,onChange:e=>setOzState(prev=>({...prev,[b.id]:parseInt(e.target.value)})),className:"w-full h-1 cursor-pointer",style:{accentColor:b.color}}))))))),/*#__PURE__*/React.createElement("div",{className:`flex-1 flex flex-col p-4 gap-4 ${ozState.activeModule==='maximizer'?'':'hidden'}`},/*#__PURE__*/React.createElement("div",{className:"oz-panel p-4 rounded-xl flex-1 grid grid-cols-12 gap-6 items-center"},/*#__PURE__*/React.createElement("div",{className:"col-span-4 flex flex-col items-center justify-center border-r border-slate-800 pr-4"},/*#__PURE__*/React.createElement("span",{className:"text-xs font-bold text-slate-400 uppercase oz-font-mono mb-3"},"Maximizer Gain Boost"),/*#__PURE__*/React.createElement("div",{className:"my-2"},/*#__PURE__*/React.createElement(MasteringKnob,{param:"maxGain",min:0,max:12,value:ozState.maxGain,unit:"dB",color:"#22d3ee",size:"large",onChange:(p,v)=>setOzState(prev=>({...prev,[p]:v}))})),/*#__PURE__*/React.createElement("div",{className:"w-full mt-4 bg-slate-950 p-2 rounded-lg border border-slate-800 text-xs oz-font-mono flex flex-col gap-1.5"},/*#__PURE__*/React.createElement("div",{className:"flex justify-between items-center w-full"},/*#__PURE__*/React.createElement("span",{className:"text-slate-400"},"Ceiling Level:"),/*#__PURE__*/React.createElement("span",{className:"text-cyan-400 font-bold"},ozState.ceiling.toFixed(2)," dB")),/*#__PURE__*/React.createElement("input",{type:"range",min:"-12",max:"0",step:"0.1",value:ozState.ceiling,onChange:e=>setOzState(prev=>({...prev,ceiling:parseFloat(e.target.value)})),className:"w-full h-1 cursor-pointer accent-cyan-400"}))),/*#__PURE__*/React.createElement("div",{className:"col-span-8 grid grid-cols-3 gap-4"},/*#__PURE__*/React.createElement("div",{className:"bg-slate-950 p-3 border border-slate-800 rounded-xl flex flex-col items-center justify-center h-full"},/*#__PURE__*/React.createElement(MasteringKnob,{param:"maxUpward",min:0,max:10,value:ozState.maxUpward,unit:"dB",label:"UPWARD COMPRESS",color:"#22d3ee",onChange:(p,v)=>setOzState(prev=>({...prev,[p]:v}))})),/*#__PURE__*/React.createElement("div",{className:"bg-slate-950 p-3 border border-slate-800 rounded-xl flex flex-col items-center justify-center h-full"},/*#__PURE__*/React.createElement(MasteringKnob,{param:"maxSoftClip",min:0,max:100,value:ozState.maxSoftClip,unit:"%",label:"SOFT 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border border-cyan-800/60 px-1.5 py-0.2 rounded font-mono"},"Real-time Oscilloscope")),/*#__PURE__*/React.createElement("div",{className:"flex gap-2"},['Scope','Settings','Help','About'].map(tab=>/*#__PURE__*/React.createElement("button",{key:tab,className:`px-2 py-0.5 rounded text-[10px] font-bold ${tab==='Scope'?'bg-cyan-950 text-cyan-300 border border-cyan-800/60':'text-slate-400 hover:text-slate-200'}`},tab)))),/*#__PURE__*/React.createElement("div",{className:"relative w-full h-32 bg-[#090d16] border border-slate-800/80 rounded-lg overflow-hidden mb-2"},/*#__PURE__*/React.createElement("canvas",{ref:woCanvasRef,className:"w-full h-full block"})),/*#__PURE__*/React.createElement("div",{className:"flex items-center justify-between gap-4 text-[10px] oz-font-mono text-slate-400 mt-1 select-none"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-2 bg-slate-950 px-2.5 py-1.5 rounded border border-slate-800/80 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gap-1.5"},/*#__PURE__*/React.createElement("span",null,"Mode"),/*#__PURE__*/React.createElement("select",{value:woMode,onChange:e=>setWoMode(e.target.value),className:"bg-slate-900 border border-slate-700 rounded px-1.5 py-0.5 text-[9px] text-slate-300 outline-none"},/*#__PURE__*/React.createElement("option",{value:"waveform"},"Waveform"),/*#__PURE__*/React.createElement("option",{value:"envelope"},"Envelope"))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1.5"},/*#__PURE__*/React.createElement("span",null,"Duration:"),/*#__PURE__*/React.createElement("span",{className:"text-cyan-400 font-bold w-10 text-right"},woDuration.toFixed(3),"s"),/*#__PURE__*/React.createElement("input",{type:"range",min:"0.5",max:"5.0",step:"0.1",value:woDuration,onChange:e=>setWoDuration(parseFloat(e.target.value)),className:"w-16 h-1 cursor-pointer accent-cyan-400"})),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1.5"},/*#__PURE__*/React.createElement("span",null,"V.Zoom:"),/*#__PURE__*/React.createElement("span",{className:"text-cyan-400 font-bold w-12 text-right"},woZoom.toFixed(1)," dB"),/*#__PURE__*/React.createElement("input",{type:"range",min:"-12",max:"24",step:"0.5",value:woZoom,onChange:e=>setWoZoom(parseFloat(e.target.value)),className:"w-16 h-1 cursor-pointer accent-cyan-400"}))),/*#__PURE__*/React.createElement("button",{onClick:()=>setWoPaused(!woPaused),className:`px-3 py-1 rounded font-bold border transition shadow-md shrink-0 flex items-center gap-1 ${woPaused?'bg-amber-800 hover:bg-amber-700 border-amber-500 text-amber-100':'bg-slate-800 hover:bg-slate-700 border-slate-700 text-slate-200'}`},woPaused?'Resume':'Pause')))),/*#__PURE__*/React.createElement("div",{className:"w-64 bg-slate-900 border-l border-slate-800/80 p-3 flex flex-col justify-between shadow-2xl oz-font-mono text-xs z-20 shrink-0"},/*#__PURE__*/React.createElement("div",{className:"flex items-center 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 const MEDIA_LIBRARY_SAMPLES=[{name:"MIDI_Loop_01.mid",events:95,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_02_Bass.mid",events:48,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_03_Lead.mid",events:110,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_04.mid",events:76,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_05_Bass.mid",events:52,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"},{name:"MIDI_Loop_06.mid",events:88,lengthQn:16,time:"0:08.000",tpqn:480,bpm:130,kind:"midi"}];const MediaExplorerPanel=({height})=>{const[userFiles,setUserFiles]=React.useState([]);const[folder,setFolder]=React.useState('library');const[selected,setSelected]=React.useState(null);const[filterText,setFilterText]=React.useState('');const[viewMode,setViewMode]=React.useState('details');const[isPlaying,setIsPlaying]=React.useState(false);const[isPaused,setIsPaused]=React.useState(false);const[isLooping,setIsLooping]=React.useState(false);const[autoPlay,setAutoPlay]=React.useState(true);const[pitch,setPitch]=React.useState(0.0);const[rate,setRate]=React.useState(1.0);const[volumeDb,setVolumeDb]=React.useState(0.0);const[currentTime,setCurrentTime]=React.useState(0);const[peaks,setPeaks]=React.useState(null);const[audioBuffer,setAudioBuffer]=React.useState(null);const[audioDuration,setAudioDuration]=React.useState(0);const[midiNotes,setMidiNotes]=React.useState(null);const[midiTotal,setMidiTotal]=React.useState(4);const[midiBars,setMidiBars]=React.useState(1);const[midiTotalBeats,setMidiTotalBeats]=React.useState(16);const[midiFileBpm,setMidiFileBpm]=React.useState(120);const[tempo,setTempo]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_tempo');return saved?parseInt(saved):120;}());// Refs mirror latest state so drawCanvas (also called from rAF clock with a
 // stale closure) always draws the currently selected file, not the old one.
-const selectedRef=React.useRef(null);const peaksRef=React.useRef(null);const audioBufferRef=React.useRef(null);const audioDurationRef=React.useRef(0);const midiNotesRef=React.useRef(null);const midiTotalRef=React.useRef(4);const midiBarsRef=React.useRef(1);const midiTotalBeatsRef=React.useRef(16);const midiFileBpmRef=React.useRef(120);const isPlayingRef=React.useRef(false);const isPausedRef=React.useRef(false);const folderRef=React.useRef('library');const tempoRef=React.useRef(120);const currentTimeRef=React.useRef(0);selectedRef.current=selected;peaksRef.current=peaks;audioBufferRef.current=audioBuffer;audioDurationRef.current=audioDuration;midiNotesRef.current=midiNotes;midiTotalRef.current=midiTotal;midiBarsRef.current=midiBars;midiTotalBeatsRef.current=midiTotalBeats;midiFileBpmRef.current=midiFileBpm;isPlayingRef.current=isPlaying;isPausedRef.current=isPaused;folderRef.current=folder;tempoRef.current=tempo;currentTimeRef.current=currentTime;const[computerRoots,setComputerRoots]=React.useState(null);const[computerTree,setComputerTree]=React.useState({});const[computerPath,setComputerPath]=React.useState(null);const[computerFiles,setComputerFiles]=React.useState([]);const[computerMode,setComputerMode]=React.useState('server');const[clientRoot,setClientRoot]=React.useState(null);const[synthInst,setSynthInst]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_synth');return saved?JSON.parse(saved):null;}());const[synthOpen,setSynthOpen]=React.useState(false);const[synthList,setSynthList]=React.useState(null);const[synthLoading,setSynthLoading]=React.useState(false);const synthListRef=React.useRef(null);synthListRef.current=synthList;const synthInstRef=React.useRef(null);synthInstRef.current=synthInst;const[treeWidth,setTreeWidth]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_tree_width');return saved?parseInt(saved):176;}());const treeWidthRef=React.useRef(176);treeWidthRef.current=treeWidth;const startTreeResize=e=>{e.preventDefault();const startX=e.clientX;const startW=treeWidthRef.current;const onMove=ev=>{const newW=Math.max(110,Math.min(420,startW+(ev.clientX-startX)));treeWidthRef.current=newW;setTreeWidth(newW);};const onUp=()=>{document.removeEventListener('mousemove',onMove);document.removeEventListener('mouseup',onUp);localStorage.setItem('studio_media_explorer_tree_width',treeWidthRef.current.toString());};document.addEventListener('mousemove',onMove);document.addEventListener('mouseup',onUp);};const canvasRef=React.useRef(null);const playStateRef=React.useRef(null);const rafRef=React.useRef(null);const loopTimerRef=React.useRef(null);const selectTokenRef=React.useRef(0);React.useEffect(()=>{if(window.SonicAPI&&window.SonicAPI.listMyFiles){window.SonicAPI.listMyFiles([]).then(data=>setUserFiles(data||[])).catch(()=>{});}return()=>{stopMediaPlayback();};// eslint-disable-next-line react-hooks/exhaustive-deps
+const selectedRef=React.useRef(null);const peaksRef=React.useRef(null);const audioBufferRef=React.useRef(null);const audioDurationRef=React.useRef(0);const midiNotesRef=React.useRef(null);const midiTotalRef=React.useRef(4);const midiBarsRef=React.useRef(1);const midiTotalBeatsRef=React.useRef(16);const midiFileBpmRef=React.useRef(120);const isPlayingRef=React.useRef(false);const isPausedRef=React.useRef(false);const folderRef=React.useRef('library');const tempoRef=React.useRef(120);const currentTimeRef=React.useRef(0);selectedRef.current=selected;peaksRef.current=peaks;audioBufferRef.current=audioBuffer;audioDurationRef.current=audioDuration;midiNotesRef.current=midiNotes;midiTotalRef.current=midiTotal;midiBarsRef.current=midiBars;midiTotalBeatsRef.current=midiTotalBeats;midiFileBpmRef.current=midiFileBpm;isPlayingRef.current=isPlaying;isPausedRef.current=isPaused;folderRef.current=folder;tempoRef.current=tempo;currentTimeRef.current=currentTime;const[computerRoots,setComputerRoots]=React.useState(null);const[computerTree,setComputerTree]=React.useState({});const[computerPath,setComputerPath]=React.useState(null);const[computerFiles,setComputerFiles]=React.useState([]);const[computerMode,setComputerMode]=React.useState('server');const[clientRoot,setClientRoot]=React.useState(null);const[favorites,setFavorites]=React.useState(function(){try{return JSON.parse(localStorage.getItem('studio_media_explorer_favorites_v1')||'[]');}catch(e){return[];}}());const[favContext,setFavContext]=React.useState(null);const[synthInst,setSynthInst]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_synth');return saved?JSON.parse(saved):null;}());const[synthOpen,setSynthOpen]=React.useState(false);const[synthList,setSynthList]=React.useState(null);const[synthLoading,setSynthLoading]=React.useState(false);const synthListRef=React.useRef(null);synthListRef.current=synthList;const synthInstRef=React.useRef(null);synthInstRef.current=synthInst;const[treeWidth,setTreeWidth]=React.useState(function(){var saved=localStorage.getItem('studio_media_explorer_tree_width');return saved?parseInt(saved):176;}());const treeWidthRef=React.useRef(176);treeWidthRef.current=treeWidth;const startTreeResize=e=>{e.preventDefault();const startX=e.clientX;const startW=treeWidthRef.current;const onMove=ev=>{const newW=Math.max(110,Math.min(420,startW+(ev.clientX-startX)));treeWidthRef.current=newW;setTreeWidth(newW);};const onUp=()=>{document.removeEventListener('mousemove',onMove);document.removeEventListener('mouseup',onUp);localStorage.setItem('studio_media_explorer_tree_width',treeWidthRef.current.toString());};document.addEventListener('mousemove',onMove);document.addEventListener('mouseup',onUp);};const canvasRef=React.useRef(null);const playStateRef=React.useRef(null);const rafRef=React.useRef(null);const loopTimerRef=React.useRef(null);const selectTokenRef=React.useRef(0);React.useEffect(()=>{if(window.SonicAPI&&window.SonicAPI.listMyFiles){window.SonicAPI.listMyFiles([]).then(data=>setUserFiles(data||[])).catch(()=>{});}return()=>{stopMediaPlayback();};// eslint-disable-next-line react-hooks/exhaustive-deps
 },[]);// ── Session persistence: keep loaded folder/files/tree across panel toggles & reloads ──
 const SESSION_KEY='studio_media_explorer_session_v1';const saveClientRootHandle=()=>{if(!clientRoot||!window.indexedDB)return;try{const req=indexedDB.open('sonicforge_media_explorer',1);req.onupgradeneeded=e=>{const db=e.target.result;if(!db.objectStoreNames.contains('root_handle'))db.createObjectStore('root_handle');};req.onsuccess=()=>{const db=req.result;const tx=db.transaction('root_handle','readwrite');tx.objectStore('root_handle').put(clientRoot,'client_root');};}catch(e){}};const loadClientRootHandle=()=>{return new Promise(resolve=>{if(!window.indexedDB){resolve(null);return;}try{const req=indexedDB.open('sonicforge_media_explorer',1);req.onupgradeneeded=e=>{const db=e.target.result;if(!db.objectStoreNames.contains('root_handle'))db.createObjectStore('root_handle');};req.onsuccess=()=>{const db=req.result;try{const tx=db.transaction('root_handle','readonly');const g=tx.objectStore('root_handle').get('client_root');g.onsuccess=()=>resolve(g.result||null);g.onerror=()=>resolve(null);}catch(e2){resolve(null);}};req.onerror=()=>resolve(null);}catch(e){resolve(null);}});};const saveSession=React.useCallback(()=>{try{const stripHandle=o=>{if(Array.isArray(o))return o.map(stripHandle);if(o&&typeof o==='object'){const out={};for(const k of Object.keys(o)){if(k==='handle')continue;out[k]=stripHandle(o[k]);}return out;}return o;};const treeSnapshot={};Object.keys(computerTree).forEach(path=>{const node=computerTree[path];treeSnapshot[path]={dirs:stripHandle(node?node.dirs:[]),expanded:!!(node&&node.expanded)};});const snap={folder,computerMode,computerPath,clientRootName:clientRoot?clientRoot.name:null,computerRoots:stripHandle(computerRoots||[]),computerTree:treeSnapshot,computerFiles:stripHandle(computerFiles||[]),selected:selected?stripHandle({name:selected.name,path:selected.path,kind:selected.kind,is_dir:selected.is_dir,size_mb:selected.size_mb}):null,savedAt:Date.now()};localStorage.setItem(SESSION_KEY,JSON.stringify(snap));}catch(e){}},[folder,computerMode,computerPath,clientRoot,computerRoots,computerTree,computerFiles,selected]);React.useEffect(()=>{saveSession();if(computerMode==='client'&&clientRoot&&clientRoot.kind==='directory')saveClientRootHandle();},[saveSession,computerMode,clientRoot]);const restoreSession=React.useCallback(()=>{try{const raw=localStorage.getItem(SESSION_KEY);if(!raw)return;const snap=JSON.parse(raw);if(snap.folder)setFolder(snap.folder);if(snap.computerMode)setComputerMode(snap.computerMode);if(snap.clientRootName)setClientRoot({name:snap.clientRootName});if(snap.computerRoots&&snap.computerRoots.length)setComputerRoots(snap.computerRoots);if(snap.computerPath)setComputerPath(snap.computerPath);if(snap.computerFiles)setComputerFiles(snap.computerFiles);if(snap.selected)setSelected(snap.selected);if(snap.computerTree){const tree={};Object.keys(snap.computerTree).forEach(path=>{tree[path]={dirs:snap.computerTree[path].dirs||[],expanded:snap.computerTree[path].expanded};});setComputerTree(tree);}}catch(e){}},[]);React.useEffect(()=>{(async()=>{await restoreSession();// Restore the FileSystemDirectoryHandle so client-mode browsing still works
 const savedHandle=await loadClientRootHandle();if(savedHandle&&savedHandle.kind==='directory'){setClientRoot(savedHandle);const restoredPath=(()=>{try{return JSON.parse(localStorage.getItem(SESSION_KEY)||'{}').computerPath;}catch(e){return null;}})();if(restoredPath){setComputerRoots([{name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle}]);// Re-browse current dir to re-attach real handles (metadata-only tree from localStorage)
@@ -242,8 +242,12 @@ const storedTree=(()=>{try{return JSON.parse(localStorage.getItem(SESSION_KEY)||
 browseComputerDir({name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle});}}})();// eslint-disable-next-line react-hooks/exhaustive-deps
 },[]);const isMidiFile=f=>f&&(f.kind==='midi'||/\.(mid|midi)$/i.test(f.name||f.original_name||''));const fileDuration=f=>{if(!f)return 0;if(isMidiFile(f)){if(midiTotalRef.current&&midiNotesRef.current&&midiNotesRef.current.length)return midiTotalRef.current;return(f.lengthQn||16)*60/(f.bpm||tempoRef.current||120);}const sel=selectedRef.current;const matches=sel&&(f.path&&f.path===sel.path||!f.path&&(f.file_id||f.fileId)===(sel.file_id||sel.fileId));return f.duration||(matches&&audioDurationRef.current?audioDurationRef.current:0)||(audioBufferRef.current&&matches?audioBufferRef.current.duration:0)||0;};const folderFiles=React.useMemo(()=>{if(folder==='library')return MEDIA_LIBRARY_SAMPLES;if(folder==='computer'){const node=computerTree[computerPath]||{dirs:[]};return[...(node.dirs||[]),...computerFiles];}return userFiles.filter(f=>folder==='uploads'?(f.type||'Upload')==='Upload':(f.type||'Processed')==='Processed');},[folder,userFiles,computerFiles,computerTree,computerPath]);const visibleFiles=React.useMemo(()=>{const q=filterText.toLowerCase().trim();if(!q)return folderFiles;return folderFiles.filter(f=>(f.name||f.original_name||'').toLowerCase().includes(q));},[folderFiles,filterText]);const loadWaveform=async f=>{const token=selectTokenRef.current;if(f&&(f.handle||f.path)){try{const buf=await readLocalFileBuffer(f);if(selectTokenRef.current!==token)return;if(!buf){setPeaks(null);return;}const ctx=getAudioContext();const decoded=await ctx.decodeAudioData(buf);if(selectTokenRef.current!==token)return;setAudioBuffer(decoded);setAudioDuration(decoded.duration);const data=decoded.getChannelData(0);const count=600;const step=Math.max(1,Math.floor(data.length/count));const pk=[];for(let i=0;i<data.length;i+=step){let m=0;for(let j=i;j<Math.min(i+step,data.length);j++){const v=Math.abs(data[j]);if(v>m)m=v;}pk.push(m);}setPeaks(pk);}catch(e){if(selectTokenRef.current===token)setPeaks(null);}return;}const fid=f.file_id||f.fileId;if(!fid){setPeaks(null);return;}try{const resp=await fetch(`${API_BASE_URL}/api/v1/audio/waveform/${fid}?num_peaks=600`);const data=await resp.json();if(selectTokenRef.current!==token)return;setPeaks(data.peaks||[]);if(data.duration)setAudioDuration(data.duration);}catch(e){setPeaks(null);}};const openMyComputer=async()=>{setFolder('computer');// Restore last opened folder from session (click My Computer → show folder content directly)
 try{const raw=localStorage.getItem(SESSION_KEY);if(raw){const snap=JSON.parse(raw);if(snap&&snap.computerPath&&snap.computerFiles){setComputerPath(snap.computerPath);setComputerFiles(snap.computerFiles);setComputerMode(snap.computerMode||'server');if(snap.computerTree){const tree={};Object.keys(snap.computerTree).forEach(p=>{tree[p]={dirs:snap.computerTree[p].dirs||[],expanded:snap.computerTree[p].expanded};});setComputerTree(tree);}if(snap.computerRoots&&snap.computerRoots.length)setComputerRoots(snap.computerRoots);if(snap.selected)setSelected(snap.selected);// For client mode, re-attach real handles by walking from the stored root handle
-if(snap.computerMode==='client'){const savedHandle=await loadClientRootHandle();if(savedHandle&&savedHandle.kind==='directory'){setClientRoot(savedHandle);setComputerRoots([{name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle}]);setComputerMode('client');browseComputerDir({name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle});}}return;}}}catch(e){}if(window.showDirectoryPicker){try{const handle=await window.showDirectoryPicker({mode:'read'});setComputerMode('client');setClientRoot(handle);const rootEntry={name:handle.name,path:'root',is_dir:true,handle};setComputerRoots([rootEntry]);setComputerPath('root');setComputerFiles([]);setComputerTree({root:{handle,parent:null,dirs:[],expanded:true}});await browseComputerDir(rootEntry);return;}catch(e){if(e&&e.name==='AbortError')return;window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');return;}}// Fallback: server API (trình duyệt không hỗ trợ File System Access API)
-setComputerMode('server');if(computerRoots)return;setComputerRoots(null);try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/computer`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();const roots=data.roots||[];setComputerRoots(roots.length?roots:[{path:'/',name:'Root (/)',is_dir:true}]);if(!roots.length)window.showToast&&window.showToast('Không tìm thấy ổ đĩa nào','warning');}catch(e){setComputerRoots([{path:'/',name:'Root (/)',is_dir:true}]);window.showToast&&window.showToast('Không thể truy cập My Computer: '+e.message,'error');}};const browseClientDir=async entry=>{const handle=entry&&entry.handle;if(!handle||!handle.entries)return;const dirs=[];const files=[];const parentPath=entry.path;try{for await(const[name,h]of handle.entries()){if(name.startsWith('.'))continue;if(h.kind==='directory'){dirs.push({name,path:parentPath+'/'+name,is_dir:true,handle:h});}else{const ext=(name.split('.').pop()||'').toLowerCase();const kind=ext==='mid'||ext==='midi'?'midi':['wav','mp3','ogg','flac','aiff','aif','m4a','aac','opus'].includes(ext)?'audio':'other';let size=0;try{const f=await h.getFile();size=f.size;}catch(e2){}files.push({name,path:parentPath+'/'+name,is_dir:false,size_mb:size?+(size/1048576).toFixed(2):0,ext:'.'+ext,kind,handle:h});}}dirs.sort((a,b)=>a.name.localeCompare(b.name));files.sort((a,b)=>a.name.localeCompare(b.name));setComputerPath(parentPath);setComputerFiles(files);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[parentPath]:{handle,parent:entry.parent||null,dirs,expanded:true}}));}catch(e){window.showToast&&window.showToast('Không thể đọc thư mục: '+e.message,'error');}};const browseComputerDir=async entry=>{if(!entry)return;if(computerMode==='client'||entry.handle){if(entry.handle&&entry.handle.entries){const parentInfo=computerTree[entry.path];await browseClientDir({...entry,parent:parentInfo?parentInfo.parent:null});return;}}const path=entry.path||entry;if(!path)return;try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/browse?path=${encodeURIComponent(path)}`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();setComputerPath(data.path);setComputerFiles(data.files||[]);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[path]:{dirs:data.dirs||[],expanded:true}}));}catch(e){window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');}};const toggleComputerDir=async entry=>{if(!entry)return;const path=entry.path||entry;const node=computerTree[path];if(node&&node.expanded){setComputerTree(prev=>({...prev,[path]:{...prev[path],expanded:false}}));}else{await browseComputerDir(entry);}};const goComputerParent=()=>{if(!computerPath)return;if(computerMode==='client'||clientRoot){const node=computerTree[computerPath];const parentHandle=node&&node.parent;if(parentHandle){const parentEntry=computerRoots&&computerRoots[0]&&parentHandle===clientRoot?computerRoots[0]:{name:parentHandle.name,path:computerPath.split('/').slice(0,-1).join('/')||'root',is_dir:true,handle:parentHandle};browseComputerDir({...parentEntry,parent:parentHandle===clientRoot?null:computerTree[parentEntry.path]?computerTree[parentEntry.path].parent:null});}return;}const isUnix=computerPath.startsWith('/');const parts=computerPath.split(/[\\/]/).filter(Boolean);parts.pop();if(isUnix){browseComputerDir(parts.length?'/'+parts.join('/'):'/');}else{// Windows: quay về root ổ đĩa nếu đã lên tới đỉnh
+if(snap.computerMode==='client'){const savedHandle=await loadClientRootHandle();if(savedHandle&&savedHandle.kind==='directory'){setClientRoot(savedHandle);setComputerRoots([{name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle}]);setComputerMode('client');browseComputerDir({name:savedHandle.name,path:'root',is_dir:true,handle:savedHandle});}}return;}}}catch(e){}if(window.showDirectoryPicker){try{const handle=await window.showDirectoryPicker({mode:'read'});setComputerMode('client');setClientRoot(handle);const rootEntry={name:handle.name,path:'root',is_dir:true,handle};setComputerRoots([rootEntry]);setComputerPath('root');setComputerFiles([]);setComputerTree({root:{handle,parent:null,dirs:[],expanded:true}});const browsed=await browseComputerDir(rootEntry);// Tự động load cấu trúc: expand từng thư mục con cấp 1 để hiển thị cây
+if(browsed&&browsed.dirs){browsed.dirs.slice(0,10).forEach(d=>browseComputerDir(d));}return;}catch(e){if(e&&e.name==='AbortError')return;window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');return;}}// Fallback: server API (trình duyệt không hỗ trợ File System Access API)
+setComputerMode('server');if(computerRoots)return;setComputerRoots(null);try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/computer`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();const roots=data.roots||[];setComputerRoots(roots.length?roots:[{path:'/',name:'Root (/)',is_dir:true}]);if(!roots.length)window.showToast&&window.showToast('Không tìm thấy ổ đĩa nào','warning');}catch(e){setComputerRoots([{path:'/',name:'Root (/)',is_dir:true}]);window.showToast&&window.showToast('Không thể truy cập My Computer: '+e.message,'error');}};const browseClientDir=async entry=>{const handle=entry&&entry.handle;if(!handle||!handle.entries)return null;const dirs=[];const files=[];const parentPath=entry.path;try{for await(const[name,h]of handle.entries()){if(name.startsWith('.'))continue;if(h.kind==='directory'){dirs.push({name,path:parentPath+'/'+name,is_dir:true,handle:h});}else{const ext=(name.split('.').pop()||'').toLowerCase();const kind=ext==='mid'||ext==='midi'?'midi':['wav','mp3','ogg','flac','aiff','aif','m4a','aac','opus'].includes(ext)?'audio':'other';let size=0;try{const f=await h.getFile();size=f.size;}catch(e2){}files.push({name,path:parentPath+'/'+name,is_dir:false,size_mb:size?+(size/1048576).toFixed(2):0,ext:'.'+ext,kind,handle:h});}}dirs.sort((a,b)=>a.name.localeCompare(b.name));files.sort((a,b)=>a.name.localeCompare(b.name));setComputerPath(parentPath);setComputerFiles(files);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[parentPath]:{handle,parent:entry.parent||null,dirs,expanded:true}}));return{dirs,files};}catch(e){window.showToast&&window.showToast('Không thể đọc thư mục: '+e.message,'error');return null;}};const browseComputerDir=async entry=>{if(!entry)return null;if(computerMode==='client'||entry.handle){if(entry.handle&&entry.handle.entries){const parentInfo=computerTree[entry.path];return await browseClientDir({...entry,parent:parentInfo?parentInfo.parent:null});}}const path=entry.path||entry;if(!path)return null;try{const resp=await fetch(`${API_BASE_URL}/api/v1/media/browse?path=${encodeURIComponent(path)}`);if(!resp.ok)throw new Error('HTTP '+resp.status);const data=await resp.json();setComputerPath(data.path);setComputerFiles(data.files||[]);setSelected(null);setCurrentTime(0);stopMediaPlayback();setComputerTree(prev=>({...prev,[path]:{dirs:data.dirs||[],expanded:true}}));return{dirs:data.dirs||[],files:data.files||[]};}catch(e){window.showToast&&window.showToast('Không thể mở thư mục: '+e.message,'error');return null;}};const toggleComputerDir=async entry=>{if(!entry)return;const path=entry.path||entry;const node=computerTree[path];if(node&&node.expanded){setComputerTree(prev=>({...prev,[path]:{...prev[path],expanded:false}}));}else{await browseComputerDir(entry);}};// ── Favorites: thư mục yêu thích ──
+const isFavorite=entry=>{if(!entry)return false;return(favorites||[]).some(f=>f.path===(entry.path||entry));};const toggleFavorite=(entry,e)=>{if(e&&e.stopPropagation)e.stopPropagation();if(!entry)return;const path=entry.path||entry;const name=entry.name||path.split('/').pop()||path;setFavorites(prev=>{const exists=prev.some(f=>f.path===path);const next=exists?prev.filter(f=>f.path!==path):[...prev,{path,name,is_dir:true}];try{localStorage.setItem('studio_media_explorer_favorites_v1',JSON.stringify(next));}catch(e2){}return next;});window.showToast&&window.showToast('Đã '+(isFavorite(entry)?'gỡ khỏi':'thêm vào')+' Favorites: '+name,'info');};const openFavorite=fav=>{if(!fav)return;setFolder('computer');const entry={path:fav.path,name:fav.name,is_dir:true};// Cố gắng tìm handle trong cây đã load để mở trực tiếp
+const node=computerTree[fav.path];if(node&&node.handle){browseComputerDir({...entry,handle:node.handle});}else if(fav.path==='root'&&clientRoot){browseComputerDir({name:clientRoot.name,path:'root',is_dir:true,handle:clientRoot});}else if(fav.path&&fav.path.startsWith('root/')&&clientRoot){// Duyệt lại từ root handle tới folder favorite
+const segments=fav.path.split('/').slice(1);let curHandle=clientRoot;const walk=async idx=>{if(idx>=segments.length){browseComputerDir({name:segments[idx-1]||clientRoot.name,path:fav.path,is_dir:true,handle:curHandle});return;}try{const child=await curHandle.getDirectoryHandle(segments[idx]);curHandle=child;walk(idx+1);}catch(e){window.showToast&&window.showToast('Không mở được thư mục favorite','error');}};walk(0);}else if(fav.path){browseComputerDir(entry);}};const goComputerParent=()=>{if(!computerPath)return;if(computerMode==='client'||clientRoot){const node=computerTree[computerPath];const parentHandle=node&&node.parent;if(parentHandle){const parentEntry=computerRoots&&computerRoots[0]&&parentHandle===clientRoot?computerRoots[0]:{name:parentHandle.name,path:computerPath.split('/').slice(0,-1).join('/')||'root',is_dir:true,handle:parentHandle};browseComputerDir({...parentEntry,parent:parentHandle===clientRoot?null:computerTree[parentEntry.path]?computerTree[parentEntry.path].parent:null});}return;}const isUnix=computerPath.startsWith('/');const parts=computerPath.split(/[\\/]/).filter(Boolean);parts.pop();if(isUnix){browseComputerDir(parts.length?'/'+parts.join('/'):'/');}else{// Windows: quay về root ổ đĩa nếu đã lên tới đỉnh
 browseComputerDir(parts.length?parts.join('\\'):computerPath.split(/[\\/]/)[0]+'\\');}};const readLocalFileBuffer=async f=>{if(f&&f.handle&&typeof f.handle.getFile==='function'){const file=await f.handle.getFile();return await file.arrayBuffer();}const url=filePreviewUrl(f);if(!url)return null;const resp=await fetch(url);return await resp.arrayBuffer();};const filePreviewUrl=f=>{if(f&&f.path&&!(f.handle&&f.handle.getFile))return`${API_BASE_URL}/api/v1/media/file?path=${encodeURIComponent(f.path)}`;const fid=f&&(f.file_id||f.fileId);return fid?`${API_BASE_URL}/api/v1/audio/download/${fid}`:null;};const toggleSynthDropdown=()=>{if(synthOpen){setSynthOpen(false);return;}setSynthOpen(true);if(synthListRef.current)return;setSynthLoading(true);(window.SonicAPI&&window.SonicAPI.listPlugins?window.SonicAPI.listPlugins():Promise.resolve({soundfonts:[]})).then(async data=>{const sfonts=data&&data.soundfonts||[];if(!sfonts.length){setSynthList([]);setSynthLoading(false);return;}const results=await Promise.all(sfonts.map(sf=>{const baseId=String(sf.id||'').replace('sf_','');return(window.SonicAPI.listSoundfontInstruments?window.SonicAPI.listSoundfontInstruments(baseId):Promise.resolve({presets:[]})).then(r=>({sf,presets:r&&r.presets||[]})).catch(()=>({sf,presets:[]}));}));setSynthList(results);setSynthLoading(false);}).catch(()=>{setSynthList([]);setSynthLoading(false);});};const selectSynthInst=inst=>{setSynthInst(inst);synthInstRef.current=inst;setSynthOpen(false);localStorage.setItem('studio_media_explorer_synth',JSON.stringify(inst));// Realtime: re-schedule current MIDI preview with the newly selected instrument
 const cur=selectedRef.current;if(isPlayingRef.current&&cur&&isMidiFile(cur)&&(cur.handle||cur.path||cur.file_id||cur.fileId)){selectTokenRef.current++;const token=selectTokenRef.current;try{if(window.SonicSF&&typeof window.SonicSF.stopAll==='function')window.SonicSF.stopAll();}catch(e){}playMidiPreview(cur,token);}};const playMidiPreview=async(f,token)=>{// Play real MIDI file through selected synth instrument (SonicSF)
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@@ -260,8 +264,8 @@ const midiPlayheadX=contentW>w?Math.min(w/2,t*pxPerSec):Math.min(w,t*pxPerSec);i
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${isSel?'file-row-selected':''}`,onClick:()=>f.is_dir?browseComputerDir(f):handleSelect(f),onDoubleClick:()=>f.is_dir&&browseComputerDir(f)},/*#__PURE__*/React.createElement("td",{className:"py-1 px-2"},/*#__PURE__*/React.createElement("i",{className:`fa-solid ${icon} mr-2`}),f.name||f.original_name),viewMode==='details'&&/*#__PURE__*/React.createElement("td",{className:"py-1 px-2"},f.size_mb!=null?f.size_mb.toFixed(2)+' MB':isMidi?(f.tpqn||'MIDI')+' TPQN':'-'));}),visibleFiles.length===0&&/*#__PURE__*/React.createElement("tr",null,/*#__PURE__*/React.createElement("td",{className:"py-3 px-2 text-slate-400 italic",colSpan:viewMode==='details'?2:1},"No files")))))),/*#__PURE__*/React.createElement("div",{className:"h-[38%] min-h-[110px] bg-[#d4d0c8] border-t border-[#808080] p-1.5 flex flex-col justify-between text-xs shrink-0 select-none"},/*#__PURE__*/React.createElement("div",{className:"flex items-center justify-between gap-2"},/*#__PURE__*/React.createElement("div",{className:"flex 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rounded-sm font-bold text-[10px] flex items-center gap-1 ${synthInst?'bg-gradient-to-r from-violet-600 to-fuchsia-600 text-white border-slate-700':'bg-[#e0e0e0] text-slate-600 border-[#707070]'}`,title:"Chọn instrument để preview MIDI",onClick:toggleSynthDropdown},/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-music text-[9px]"})," ",/*#__PURE__*/React.createElement("span",null,"Synth",synthInst?': '+(synthInst.name||'?'):''),/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-caret-down text-[8px]"})),synthOpen&&/*#__PURE__*/React.createElement("div",{className:"absolute bottom-8 left-0 z-40 w-64 bg-white border border-[#808080] shadow-xl rounded-sm text-xs text-slate-800 font-sans max-h-72 overflow-y-auto"},/*#__PURE__*/React.createElement("div",{className:"sticky top-0 bg-[#e0e0e0] px-2 py-1 font-bold border-b border-[#a0a0a0] flex items-center justify-between"},/*#__PURE__*/React.createElement("span",null,"Select 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border-t border-[#e0e0e0] truncate"},group.sf.display||group.sf.name||group.sf.id),(group.presets||[]).slice(0,200).map((p,pi)=>{const progId=p.id||p.name||'preset_'+pi;return/*#__PURE__*/React.createElement("div",{key:progId,className:`flex items-center gap-1 px-2 pl-4 py-0.5 cursor-pointer hover:bg-blue-100 truncate ${synthInst&&synthInst.program===p.program&&synthInst.sfId===(group.sf.id||group.sf.name)?'bg-slate-200':''}`,onClick:()=>selectSynthInst({sfId:group.sf.id,sfName:group.sf.display||group.sf.name||group.sf.id,bank:p.bank||0,program:p.program,name:p.name||'Program '+p.program})},p.bank===128?/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-drum text-slate-400"}):/*#__PURE__*/React.createElement("i",{className:"fa-solid fa-music text-slate-400"})," ",p.name||'Program '+p.program);}))))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1",title:"Tempo preview MIDI"},/*#__PURE__*/React.createElement("span",{className:"font-mono text-[10px] text-slate-700"},"Tempo:"),/*#__PURE__*/React.createElement("button",{className:"px-1 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[10px]",onClick:()=>{const nt=Math.max(40,tempo-1);setTempo(nt);localStorage.setItem('studio_media_explorer_tempo',nt.toString());}},"-"),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center w-11"},/*#__PURE__*/React.createElement("input",{type:"number",min:"40",max:"300",value:tempo,onChange:e=>{const v=Math.max(40,Math.min(300,parseInt(e.target.value)||120));setTempo(v);localStorage.setItem('studio_media_explorer_tempo',v.toString());},className:"w-full text-xs text-right outline-none bg-transparent"})),/*#__PURE__*/React.createElement("button",{className:"px-1 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[10px]",onClick:()=>{const nt=Math.min(300,tempo+1);setTempo(nt);localStorage.setItem('studio_media_explorer_tempo',nt.toString());}},"+"),/*#__PURE__*/React.createElement("span",{className:"text-slate-600 text-[10px]"},"BPM"))),/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3 font-mono text-[11px]"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-1"},/*#__PURE__*/React.createElement("span",null,"Pitch:"),/*#__PURE__*/React.createElement("button",{className:"px-1 bg-[#e0e0e0] hover:bg-white border border-[#707070] rounded-sm text-[10px]",onClick:()=>togglePitch(-0.5)},"-"),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center w-14"},/*#__PURE__*/React.createElement("input",{type:"number",value:pitch.toFixed(1),step:"0.5",onChange:e=>setPitch(parseFloat(e.target.value)||0),className:"w-full text-xs text-right outline-none bg-transparent"})),/*#__PURE__*/React.createElement("button",{className:"px-1 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items-center gap-2"},/*#__PURE__*/React.createElement("span",{className:"font-sans text-slate-700"},"Volume:"),/*#__PURE__*/React.createElement("input",{type:"range",min:"-60",max:"12",step:"0.5",value:volumeDb,onChange:e=>setVolumeDb(parseFloat(e.target.value)),className:"me-fader-slider w-24"}),/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1 h-5 flex items-center justify-center w-14 font-mono text-[11px]"},volumeDb<=-50?'-inf':volumeDb.toFixed(1)," dB")),/*#__PURE__*/React.createElement("div",{className:`px-2 py-0.5 border font-mono font-bold text-[10px] rounded-sm ${selIsMidi?'bg-purple-950 text-purple-300 border-purple-800':'bg-emerald-950 text-emerald-300 border-emerald-800'}`},selIsMidi?'MIDI':'Audio')),/*#__PURE__*/React.createElement("div",{className:"flex items-stretch gap-2 my-1 flex-1 min-h-0"},/*#__PURE__*/React.createElement("div",{className:"flex-1 bg-[#181818] border border-[#3a3a3a] relative overflow-hidden"},/*#__PURE__*/React.createElement("canvas",{ref:canvasRef,className:"w-full h-full block cursor-pointer"})),/*#__PURE__*/React.createElement("div",{className:"w-48 bg-[#181818] border border-[#3a3a3a] p-1.5 font-mono text-[10px] text-slate-300 leading-tight overflow-y-auto shrink-0"},selected?selIsMidi&&!selected.path?/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,selected.events," MIDI events"),/*#__PURE__*/React.createElement("div",null,"Length: ",selected.lengthQn," quarter notes"),/*#__PURE__*/React.createElement("div",null,"Length: ",selected.time," (est)"),/*#__PURE__*/React.createElement("div",null,"Ticks per quarter note: ",selected.tpqn)):/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,"Size: ",selected.size_mb!=null?selected.size_mb.toFixed(2)+' MB':'-'),selIsMidi?/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,"Bars: ",midiBars||1),/*#__PURE__*/React.createElement("div",null,"Beats: ",Math.round(midiTotalBeats||16)),/*#__PURE__*/React.createElement("div",null,"BPM: ",midiFileBpm||120),/*#__PURE__*/React.createElement("div",null,"Duration: ",selDur.toFixed(2),"s")):/*#__PURE__*/React.createElement(React.Fragment,null,/*#__PURE__*/React.createElement("div",null,"Duration: ",selDur.toFixed(2),"s"),/*#__PURE__*/React.createElement("div",null,"Sample Rate: 44100 Hz"),/*#__PURE__*/React.createElement("div",null,"Type: ",selected.path?selected.kind==='other'?'Local File':'Local Audio':selected.type||'Audio'))):/*#__PURE__*/React.createElement("div",null,"No file selected"))),/*#__PURE__*/React.createElement("div",{className:"h-5 bg-[#c0c0c0] border-t border-white flex items-center justify-between text-[11px] font-mono px-1 shrink-0"},/*#__PURE__*/React.createElement("div",{className:"flex items-center gap-3"},selIsMidi&&midiNotes&&midiNotes.length?/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1.5 text-slate-900 font-bold"},"Bar ",Math.max(1,Math.floor(currentTime/(4*60/(tempo||120)))+1)," / ",midiBars||1,/*#__PURE__*/React.createElement("span",{className:"text-slate-500 ml-1"},"| ",formatTime(currentTime)," / ",formatTime(selDur))):/*#__PURE__*/React.createElement("div",{className:"bg-white border border-[#808080] px-1.5 text-slate-900 font-bold"},formatTime(currentTime)," / ",formatTime(selDur))),/*#__PURE__*/React.createElement("div",{className:"text-slate-800 font-bold truncate max-w-[40%]"},selected?selected.name||selected.original_name:'No file selected'),/*#__PURE__*/React.createElement("div",{className:"text-slate-700"},selBpm," bpm x",rate.toFixed(2)))));};const App=()=>{// ── State Definitions ──
 const[tracks,setTracks]=useState([{id:'1',name:'Track 01',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#0f766e',markers:[],serverFileId:null,clips:[],sections:[],midiItems:[],isArmed:false,monitoringEnabled:true,inputSource:{deviceType:'NONE',deviceId:''}},{id:'2',name:'Track 02',buffer:null,startTime:0,volumeDb:0,pan:0,muted:false,solo:false,color:'#1d4ed8',markers:[],serverFileId:null,clips:[],sections:[],midiItems:[],isArmed:false,monitoringEnabled:true,inputSource:{deviceType:'NONE',deviceId:''}}]);const[appWarningModal,setAppWarningModal]=useState(null);const[bpm,setBpm]=useState(localStorage.getItem('studio_bpm')||'120');const prevBpmRef=useRef(bpm);const[draggedClip,setDraggedClip]=useState(null);const[hoveredTrackId,setHoveredTrackId]=useState(null);// Recalculate item/section/selection durations when BPM changes
 useEffect(()=>{const oldSpb=prevBpmRef.current?60.0/parseFloat(prevBpmRef.current)*4:null;const bpmVal=parseFloat(bpm)||120;const secondsPerBar=60.0/bpmVal*4;// Recalculate range loop selection to maintain bar count (tempo mode only)
 if(oldSpb&&selectionFollowsTempo&&selectionStart!==null&&selectionEnd!==null&&selectionEnd>selectionStart){const startBar=selectionStart/oldSpb;const endBar=selectionEnd/oldSpb;if(endBar-startBar>0.01){setSelectionStart(startBar*secondsPerBar);setSelectionEnd(endBar*secondsPerBar);}}prevBpmRef.current=bpm;// Force canvas redraw
diff --git a/app/templates/index.html b/app/templates/index.html
index 028d676..254eaed 100644
--- a/app/templates/index.html
+++ b/app/templates/index.html
@@ -24,7 +24,7 @@
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202608021936" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608021956" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {
diff --git a/wiki.md b/wiki.md
index 567df2d..035e7b6 100644
--- a/wiki.md
+++ b/wiki.md
@@ -1144,3 +1144,8 @@
 - **Tóm tắt thay đổi:** `drawCanvas` branch audio: bỏ `contentW = Math.max(w, dur*pxPerSec)` (giãn đầy frame) → `contentW = max(1, dur*pxPerSec)` với `pxPerBeat=42`, `pxPerSec = 42*bpm/60` (cùng tỉ lệ tempo với MIDI). Clip ngắn hiển thị đúng chiều rộng theo tempo (2s@120 → 168px), clip dài scroll; playhead theo tỉ lệ tempo (`t*pxPerSec`, khóa giữa khi scroll). Ruler cùng scale (bỏ stretch `Math.max(w, ...)`). Thêm `audioDuration` vào deps effect redraw.
 - **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js`, `app/templates/index.html`
 - **Ghi chú/Test (nếu có):** Probe drawCanvas: 2s@120 → contentW=168, waveform maxX 167.8 < 300 (không giãn); 10s → 840 scroll; 2s@240 → 336 (rộng hơn theo tempo). Hard reload.
+
+### [2026-08-02 19:56] Task: My Computer auto-load cây + Favorites thư mục
+- **Tóm tắt thay đổi:** (1) Khi mở My Computer client-side (pick xong root), tự động browse + expand tối đa 10 thư mục con cấp 1 (`browseComputerDir`/`browseClientDir` giờ trả về `{dirs, files}` để auto-expand) → cây hiển thị cấu trúc ổ đĩa/thư mục ngay. (2) **Favorites**: node "Favorites" ngay dưới My Computer (hiện khi có favorite, icon `fa-star`); chuột phải folder trong cây (hoặc trong Favorites) → context menu "Thêm vào Favorites"/"Gỡ khỏi Favorites" + "Mở thư mục"; lưu vào `localStorage['studio_media_explorer_favorites_v1']` `[{path, name}]`; click favorite mở nhanh folder (tìm handle trong `computerTree`, hoặc walk lại từ `clientRoot` qua `getDirectoryHandle` theo segments path, fallback `browseComputerDir`); node folder có favorite hiện icon star.
+- **Các file ảnh hưởng:** `app/static/js/app.jsx`, `app/static/js/app.precompiled.js`, `app/templates/index.html`
+- **Ghi chú/Test (nếu có):** Smoke jsdom: pick root → C: + Users + Program Files auto-load; right-click Users → menu → favorite saved localStorage + node Favorites hiện; click favorite → mở `root/Users`. Hard reload.