fix: improve delete library response message and add media deletion step

src/app/api/libraries/[id]/route.ts

@@ -10,12 +10,17 @@ export async function DELETE(request: NextRequest, { params: paramsPromise }: {
   }
 
   try {
+    // First, delete all media associated with this library
+    db.prepare('DELETE FROM media WHERE library_id = ?').run(id);
+    
+    // Then delete the library itself
     const info = db.prepare('DELETE FROM libraries WHERE id = ?').run(id);
     if (info.changes === 0) {
       return NextResponse.json({ error: 'Library not found' }, { status: 404 });
     }
-    return NextResponse.json({ message: 'Library deleted' });
+    return NextResponse.json({ message: 'Library deleted successfully' });
   } catch (error: any) {
+    console.error('Error deleting library:', error);
     return NextResponse.json({ error: error.message }, { status: 500 });
   }
 }