fix(audio): offline mix limiter -3dBFS, 2-stage normalize (-14 LUFS + hard peak -1 dBTP), OGG export

app/static/js/app.jsx

@@ -18333,8 +18333,8 @@ const App = () => {
     loop: false,
     loopBars: 4,
     dither: false,
-    normalize: false,
-    normalizeTarget: '-1dbtp',
+    normalize: true,
+    normalizeTarget: '-14lufs',
     monoCheck: true,
     // Gap 13: BWF/INFO metadata cho WAV mastering export
     metaTitle: '',
@@ -27969,7 +27969,8 @@ const App = () => {
     try {
       const schema = serializeProjectToSchema(currentProjectId || 'temp_project', projectName || 'Dự án tạm chưa lưu', bpm, tracks, subTabs, sessionTabs, masteringSettings, masterVolume, { volL: masterVolL, volR: masterVolR, link: masterLink, muted: masterMuted });
       const isFloat = exportSettings.bitDepth === 'float';
-      const res = await window.SonicAPI.renderProject(schema, 'master_' + Date.now() + '.wav', {
+      const outExt = exportSettings.format === 'ogg' ? 'ogg' : 'wav';
+      const res = await window.SonicAPI.renderProject(schema, 'master_' + Date.now() + '.' + outExt, {
         bit_depth: isFloat ? 32 : parseInt(exportSettings.bitDepth) || 16,
         sample_rate: parseInt(exportSettings.sampleRate) || 44100,
         dither: !!exportSettings.dither,
@@ -27990,12 +27991,12 @@ const App = () => {
           const br = await fetch(res.url);
           if (!br.ok) throw new Error('HTTP ' + br.status);
           const b = await br.blob();
-          const sp = await saveExportViaDialog((projectName || 'Project') + '_master.wav', b);
+          const sp = await saveExportViaDialog((projectName || 'Project') + '_master.' + outExt, b);
           if (sp) showToast(`Đã lưu → ${sp}`, 'success');
         } catch (e) {
           const a = document.createElement('a');
           a.href = res.url;
-          a.download = 'master.wav';
+          a.download = 'master.' + outExt;
           a.click();
         }
       });