feat: enhance folder viewer with library fetching and error handling

- Added functionality to fetch libraries from the API and manage library paths within the folder viewer.
- Implemented error handling for directory loading, displaying user-friendly messages when errors occur.
- Updated breadcrumb navigation to reflect the current library context and improved path management.
- Enhanced UI to show error states and provide a retry option for loading directory contents.

src/app/folder-viewer/page.tsx

@@ -40,21 +40,44 @@ const FolderViewerPage = () => {
   const [selectedPhoto, setSelectedPhoto] = useState<FileSystemItem | null>(null);
   const [isPhotoViewerOpen, setIsPhotoViewerOpen] = useState(false);
   const [currentPhotoIndex, setCurrentPhotoIndex] = useState(0);
+  const [libraries, setLibraries] = useState<{id: number, path: string}[]>([]);
+  const [error, setError] = useState<string>('');
 
   useEffect(() => {
+    fetchLibraries();
     if (path) {
       fetchItems(path);
     }
   }, [path]);
 
+  const fetchLibraries = async () => {
+    try {
+      const res = await fetch('/api/libraries');
+      const data = await res.json();
+      setLibraries(data);
+    } catch (error) {
+      console.error('Error fetching libraries:', error);
+    }
+  };
+
   const fetchItems = async (currentPath: string) => {
     setLoading(true);
+    setError('');
     try {
-      const res = await fetch(`/api/files?path=${currentPath}`);
+      const res = await fetch(`/api/files?path=${encodeURIComponent(currentPath)}`);
       const data = await res.json();
+      
+      if (!Array.isArray(data)) {
+        console.error('Invalid response format:', data);
+        setItems([]);
+        setError('Invalid response from server');
+      } else {
         setItems(data);
+      }
     } catch (error) {
       console.error('Error fetching items:', error);
+      setItems([]);
+      setError('Failed to load directory contents');
     } finally {
       setLoading(false);
     }
@@ -101,19 +124,38 @@ const FolderViewerPage = () => {
     return `${truncatedDir}/${filename}`;
   };
 
+  const getLibraryRoot = (currentPath: string): string | null => {
+    if (!currentPath || libraries.length === 0) return null;
+    
+    // Find the library root that matches the current path
+    for (const library of libraries) {
+      if (currentPath.startsWith(library.path)) {
+        return library.path;
+      }
+    }
+    return null;
+  };
+
   const getBreadcrumbs = (currentPath: string): BreadcrumbItem[] => {
     if (!currentPath) return [];
     
-    const pathParts = currentPath.split('/').filter(part => part.length > 0);
+    const libraryRoot = getLibraryRoot(currentPath);
+    if (!libraryRoot) return [{ name: 'Unknown', path: currentPath }];
+    
+    // Get the relative path from library root
+    const relativePath = currentPath.substring(libraryRoot.length);
+    const pathParts = relativePath.split('/').filter(part => part.length > 0);
+    
     const breadcrumbs: BreadcrumbItem[] = [];
     
-    // Add root/home
-    breadcrumbs.push({ name: 'Home', path: '' });
+    // Use library name as root
+    const libraryName = libraryRoot.split('/').pop() || libraryRoot;
+    breadcrumbs.push({ name: libraryName, path: libraryRoot });
     
-    // Build breadcrumbs for each path level
-    let accumulatedPath = '';
+    // Build breadcrumbs for each path level within the library
+    let accumulatedPath = libraryRoot;
     pathParts.forEach((part, index) => {
-      accumulatedPath += (accumulatedPath ? '/' : '') + part;
+      accumulatedPath += '/' + part;
       breadcrumbs.push({
         name: part,
         path: accumulatedPath
@@ -125,8 +167,18 @@ const FolderViewerPage = () => {
 
   const getParentPath = (currentPath: string): string => {
     if (!currentPath) return '';
+    
+    const libraryRoot = getLibraryRoot(currentPath);
+    if (!libraryRoot) return '';
+    
+    // Don't allow navigation above library root
+    if (currentPath === libraryRoot) return '';
+    
     const pathParts = currentPath.split('/').filter(part => part.length > 0);
-    if (pathParts.length <= 1) return '';
+    const libraryParts = libraryRoot.split('/').filter(part => part.length > 0);
+    
+    if (pathParts.length <= libraryParts.length) return '';
+    
     return pathParts.slice(0, -1).join('/');
   };
 
@@ -252,6 +304,7 @@ const FolderViewerPage = () => {
                   onClick={handleBackClick}
                   className="text-zinc-400 hover:text-white hover:bg-zinc-800/50 transition-colors"
                   disabled={!getParentPath(path || '')}
+                  title={getParentPath(path || '') ? 'Go to parent directory' : 'Already at library root'}
                 >
                   <ChevronLeft className="h-4 w-4 mr-2" />
                   Back
@@ -271,11 +324,12 @@ const FolderViewerPage = () => {
                           : 'hover:underline cursor-pointer'
                       }`}
                       disabled={index === getBreadcrumbs(path || '').length - 1}
+                      title={breadcrumb.path}
                     >
-                      {breadcrumb.name === 'Home' ? (
+                      {index === 0 ? (
                         <div className="flex items-center gap-1">
                           <Home className="h-3 w-3" />
-                          <span>Home</span>
+                          <span>{breadcrumb.name}</span>
                         </div>
                       ) : (
                         breadcrumb.name
@@ -292,7 +346,27 @@ const FolderViewerPage = () => {
             </div>
 
             <div className="grid grid-cols-2 sm:grid-cols-3 md:grid-cols-4 lg:grid-cols-5 xl:grid-cols-6 2xl:grid-cols-7 gap-4">
-              {items.map((item) => (
+              {error && (
+                <div className="col-span-full text-center py-12">
+                  <div className="max-w-sm mx-auto">
+                    <div className="w-16 h-16 bg-red-900/20 rounded-2xl flex items-center justify-center mx-auto mb-4">
+                      <Folder className="h-8 w-8 text-red-500" />
+                    </div>
+                    <h3 className="text-lg font-semibold text-red-400 mb-2">Error Loading Directory</h3>
+                    <p className="text-sm text-red-500 mb-4">{error}</p>
+                    <Button
+                      onClick={() => path && fetchItems(path)}
+                      variant="outline"
+                      size="sm"
+                      className="border-red-500 text-red-500 hover:bg-red-500/10"
+                    >
+                      Try Again
+                    </Button>
+                  </div>
+                </div>
+              )}
+              
+              {!error && Array.isArray(items) && items.map((item) => (
                 <div key={item.name} 
                      className={`group relative bg-white dark:bg-slate-800 rounded-xl shadow-sm hover:shadow-lg transition-all duration-300 hover:-translate-y-1 overflow-hidden ${(item.type === 'video' || item.type === 'photo') ? 'cursor-pointer' : ''}`}>
                   <Link href={item.isDirectory ? `/folder-viewer?path=${item.path}` : '#'} 
@@ -397,7 +471,7 @@ const FolderViewerPage = () => {
               ))}
             </div>
             
-            {items.length === 0 && !loading && (
+            {items.length === 0 && !loading && !error && (
               <div className="text-center py-20">
                 <div className="max-w-sm mx-auto">
                   <div className="w-16 h-16 bg-slate-100 dark:bg-slate-800 rounded-2xl flex items-center justify-center mx-auto mb-4">