feat: bổ sung MIDI

app/static/js/services/storage.js

@@ -3,12 +3,11 @@
     const SFS_VERSION = "1.0.0";
 
     function exportProjectToSFS(projectState) {
-        const sfsBundle = {
-            format: "SONICFORGE_STUDIO_PROJECT",
-            version: SFS_VERSION,
-            timestamp: Date.now(),
-            domain: window.location.origin,
-            project: {
+        let projectObj = {};
+        if (projectState.main_session) {
+            projectObj = projectState;
+        } else {
+            projectObj = {
                 id: projectState.id || `proj_${Date.now()}`,
                 name: projectState.name || "Dự án mới",
                 tracks: (projectState.tracks || []).map(t => ({
@@ -24,7 +23,15 @@
                     markers: t.markers || [],
                     serverFileId: t.serverFileId || null
                 }))
-            }
+            };
+        }
+
+        const sfsBundle = {
+            format: "SONICFORGE_STUDIO_PROJECT",
+            version: SFS_VERSION,
+            timestamp: Date.now(),
+            domain: window.location.origin,
+            project: projectObj
         };
 
         const jsonStr = JSON.stringify(sfsBundle, null, 2);
@@ -33,7 +40,8 @@
         
         const a = document.createElement('a');
         a.href = url;
-        a.download = `${(projectState.name || 'project').replace(/\s+/g, '_')}.sfs`;
+        const displayName = projectObj.metadata?.title || projectObj.name || 'project';
+        a.download = `${displayName.replace(/\s+/g, '_')}.sfs`;
         a.click();
         URL.revokeObjectURL(url);
     }
@@ -53,7 +61,7 @@
         autoSaveTimer = setTimeout(async () => {
             try {
                 const state = getProjectStateCallback();
-                if (!state || !state.tracks || state.tracks.length === 0) return;
+                if (!state || (!state.tracks && !state.main_session)) return;
                 const dataJson = JSON.stringify(state);
                 localStorage.setItem('sonic_temp_project', dataJson);
                 if (window.SonicAPI && localStorage.getItem('sonic_token')) {