fix(export): tu dong dong modal khi hoan tat + throttle setProgress 150ms (toc do export) + dong modal path server

app/static/js/app.jsx

@@ -28101,6 +28101,8 @@ const App = () => {
                 a.click();
               }
             });
+            // Export server hoàn tất → tự đóng modal (toast Tải về vẫn hiện).
+            setShowExportPanel(false);
           }
         } else {
           throw new Error(result.error || 'Server processing failed');
@@ -28486,6 +28488,7 @@ const App = () => {
     // Yield 1 frame → React vẽ thanh "Đang xử lý..." trước khi graph build +
     // OfflineAudioContext render chặn main thread.
     await new Promise(res => setTimeout(res, 30));
+    let lastPaint = 0; // throttle setProgress 150ms — tránh re-render toàn App mỗi chunk
     try {
       const targetRate = parseInt(exportSettings.sampleRate);
       const isFloatWav = exportSettings.bitDepth === 'float';
@@ -28602,7 +28605,11 @@ const App = () => {
           let mix = null;
           let vstTi = 0;
           for (const t of activeTracks) {
-            setExportProgress(10 + Math.round((vstTi / Math.max(1, activeTracks.length)) * 40));
+            const now = Date.now();
+            if (now - lastPaint >= 150) {
+              setExportProgress(10 + Math.round((vstTi / Math.max(1, activeTracks.length)) * 40));
+              lastPaint = now;
+            }
             vstTi++;
             const chain = activeVstChain(t.vstFxChain || []);
             const tctx = new OfflineAudioContext(2, Math.ceil(targetRate * Math.max(0.1, durationLimit)), targetRate);
@@ -28703,7 +28710,13 @@ const App = () => {
             offset += bytesPerSample;
           }
         }
-        setExportProgress(60 + Math.round((encEnd / Math.max(1, exportLength)) * 32));
+        // Throttle setState 150ms → tránh re-render toàn App (1.7MB JSX) mỗi
+        // chunk — đó là thứ làm export chậm rõ rệt.
+        const now = Date.now();
+        if (now - lastPaint >= 150) {
+          setExportProgress(60 + Math.round((encEnd / Math.max(1, exportLength)) * 32));
+          lastPaint = now;
+        }
         await new Promise(res => setTimeout(res, 0));
       }
       if (peak < 0.001) {
@@ -28779,6 +28792,8 @@ const App = () => {
           showToast("Xuất bản âm thanh hoàn tất!", "success");
         }
       }
+      // Export hoàn tất → tự đóng modal.
+      setShowExportPanel(false);
       } finally {
         // Restore the LIVE master bus after offline render: initMasterBus(offlineCtx)
         // ghi đè cả `masterBus` lẫn `window.masterBus` bằng graph OfflineAudioContext