feat: implement autosave, direct saving, and topbar UI indicators

src/pages/Editor.tsx

@@ -272,6 +272,20 @@ export default function Editor() {
   const [theme, setTheme] = useState<"light" | "dark">("dark");
   const [loadedModel, setLoadedModel] = useState<THREE.Object3D | null>(null);
   const [blobURLs, setBlobURLs] = useState<string[]>([]);
+  const [projectName, setProjectName] = useState<string>('');
+  const [saveStatus, setSaveStatus] = useState<'saved' | 'saving' | 'unsaved' | 'offline'>('saved');
+  const [isOffline, setIsOffline] = useState(!navigator.onLine);
+
+  useEffect(() => {
+    const handleOnline = () => setIsOffline(false);
+    const handleOffline = () => setIsOffline(true);
+    window.addEventListener('online', handleOnline);
+    window.addEventListener('offline', handleOffline);
+    return () => {
+      window.removeEventListener('online', handleOnline);
+      window.removeEventListener('offline', handleOffline);
+    };
+  }, []);
 
   // Cleanup blob URLs on unmount
   useEffect(() => {
@@ -314,7 +328,9 @@ export default function Editor() {
       setIsLoading(true);
       try {
         const data = await api.getProject(projectId);
-        if (data.project && data.project.scene_data) {
+        if (data.project) {
+          if (data.project.name) setProjectName(data.project.name);
+          if (data.project.scene_data) {
             let sd = data.project.scene_data;
           
           if (sd.titansceneUrl) {
@@ -680,7 +696,13 @@ export default function Editor() {
     if (sceneInputRef.current) sceneInputRef.current.value = '';
   };
 
-  const saveScene = async (name?: string) => {
+  const saveScene = async (name: string) => {
+    if (!name) {
+      alert("Please provide a valid file name.");
+      return;
+    }
+    setSaveStatus('saving');
+    
     const sceneData = {
       sceneObjects, lightProps, groundProps, cameraProps,
       envPreset, envRotation, backgroundColor, backgroundType,
@@ -688,7 +710,7 @@ export default function Editor() {
       modelData: modelData ? { ...modelData } : null
     };
     
-    const projectName = name || exportDialogName || 'Untitled Scene';
+    const projectNameStr = name || exportDialogName || projectName || 'Untitled Scene';
 
     try {
       setIsRendering(true);
@@ -728,25 +750,48 @@ export default function Editor() {
       }
 
       // Upload to Cloud
-      const file = new File([blob], `${projectName.replace(/[^a-z0-9]/gi, '_').toLowerCase()}.titanscene`, { type: 'application/octet-stream' });
+      const file = new File([blob], `${projectNameStr.replace(/[^a-z0-9]/gi, '_').toLowerCase()}.titanscene`, { type: 'application/octet-stream' });
       const fileUrl = await api.uploadAsset(file);
 
       const result = await api.saveProject({
         id: projectId && projectId !== 'new' ? projectId : undefined,
-        name: projectName,
+        name: projectNameStr,
         scene_data: { titansceneUrl: fileUrl } 
       });
       if (projectId === 'new' && result.id) {
         navigate(`/editor/${result.id}`, { replace: true });
       }
+      setSaveStatus('saved');
     } catch (error) {
       console.error("Failed to save project to cloud", error);
+      setSaveStatus('unsaved');
     } finally {
       setIsRendering(false);
     }
     setExportDialog(null);
   };
 
+  const saveSceneRef = useRef(saveScene);
+  saveSceneRef.current = saveScene;
+
+  // Track changes to mark as unsaved
+  useEffect(() => {
+    if (saveStatus !== 'unsaved' && saveStatus !== 'saving') {
+      setSaveStatus('unsaved');
+    }
+  }, [sceneObjects, lightProps, groundProps, cameraProps, envPreset, envRotation, backgroundColor, backgroundType, customHdri, backplateImage, additionalLights, modelBounds, cameraPresets, modelData]);
+
+  // Autosave loop
+  useEffect(() => {
+    if (saveStatus !== 'unsaved' || isOffline || !projectId || projectId === 'new' || !projectName) return;
+    
+    const interval = setInterval(() => {
+      saveSceneRef.current(projectName);
+    }, 120000); // 2 minutes
+    
+    return () => clearInterval(interval);
+  }, [saveStatus, isOffline, projectId, projectName]);
+
   const exportTitanScene = async (name: string) => {
     const sceneData = {
       sceneObjects, lightProps, groundProps, cameraProps,
@@ -802,7 +847,12 @@ export default function Editor() {
   };
 
   const openSaveDialog = () => {
-    const defaultName = modelData?.name ? modelData.name.replace(/\.[^.]+$/, '') : 'scene';
+    if (projectId && projectId !== 'new' && projectName) {
+      saveScene(projectName);
+      setOpenMenu(null);
+      return;
+    }
+    const defaultName = projectName || (modelData?.name ? modelData.name.replace(/\.[^.]+$/, '') : 'scene');
     setExportDialogName(defaultName);
     setExportDialog({ mode: 'scene', defaultName });
     setOpenMenu(null);
@@ -2078,7 +2128,19 @@ export default function Editor() {
             <span className="hover:text-white cursor-pointer">Help</span>
           </div>
         </div>
-        <div className="flex items-center gap-2">
+        <div className="flex items-center gap-4">
+          {isOffline ? (
+            <div className="flex items-center gap-1 text-red-500 font-medium">
+              <span className="w-1.5 h-1.5 rounded-full bg-red-500 animate-pulse" />
+              Offline
+            </div>
+          ) : projectId && projectId !== 'new' ? (
+            <div className={`flex items-center gap-1 transition-colors ${saveStatus === 'saved' ? 'text-green-500' : saveStatus === 'saving' ? 'text-blue-400' : 'text-zinc-500'}`}>
+              {saveStatus === 'saving' && <Loader2 size={10} className="animate-spin" />}
+              {saveStatus === 'saved' && <Save size={10} />}
+              <span>{saveStatus === 'saved' ? 'Saved' : saveStatus === 'saving' ? 'Saving...' : 'Unsaved changes'}</span>
+            </div>
+          ) : null}
           <div className="flex items-center gap-1 bg-white dark:bg-zinc-800 px-2 py-0.5 rounded">
             <span>Startup</span>
             <ChevronDown size={12} />