Fix library path saving - auto-create directory and improve error handling

public/app.js

@@ -311,7 +311,7 @@ async function loadSettings() {
 
 // Save library path
 async function saveLibraryPath() {
-    const libraryPath = document.getElementById('libraryPath').value;
+    const libraryPath = document.getElementById('libraryPath').value.trim();
     
     if (!libraryPath) {
         alert('Please enter a library path');
@@ -328,13 +328,14 @@ async function saveLibraryPath() {
         const data = await res.json();
         
         if (res.ok) {
-            alert('Library path updated! Please restart the server for changes to take effect.');
+            alert('✅ Library path saved!\n\nPath: ' + libraryPath + '\n\nPlease restart the server for changes to take effect.');
         } else {
-            alert(`Error: ${data.error}`);
+            alert('❌ Error: ' + (data.error || 'Failed to save'));
+            console.error('Server error:', data);
         }
     } catch (error) {
         console.error('Error saving settings:', error);
-        alert('Failed to save settings');
+        alert('❌ Failed to save settings. Check console for details.\n\nError: ' + error.message);
     }
 }
 

src/routes/settings.js

@@ -44,12 +44,19 @@ router.patch('/', async (req, res) => {
     const { libraryPath } = req.body;
     
     if (libraryPath) {
-      // Validate path exists
+      // Resolve path (handle relative paths)
+      const resolvedPath = path.isAbsolute(libraryPath) 
+        ? libraryPath 
+        : path.join(process.cwd(), libraryPath);
+      
+      // Try to create directory if it doesn't exist
       try {
-        await fs.access(libraryPath);
+        await fs.mkdir(resolvedPath, { recursive: true });
         config.libraryPath = libraryPath;
       } catch (error) {
-        return res.status(400).json({ error: 'Library path does not exist' });
+        return res.status(400).json({ 
+          error: `Cannot create or access path: ${error.message}` 
+        });
       }
     }