Update "Add Manufacturer" button

src/pages/Manufacturers.tsx

@@ -130,12 +130,19 @@ export default function Manufacturers() {
               <Factory className="w-10 h-10 text-primary" />
               <h1 className="text-4xl font-bold">Manufacturers</h1>
             </div>
-            {(user && isModerator()) && (
-              <Button onClick={() => setIsCreateModalOpen(true)}>
-                <Plus className="w-4 h-4 mr-2" />
-                Create Manufacturer
+            <Button 
+              onClick={() => {
+                if (!user) {
+                  navigate('/auth');
+                } else {
+                  setIsCreateModalOpen(true);
+                }
+              }}
+              className="gap-2"
+            >
+              <Plus className="w-4 h-4" />
+              Add Manufacturer
             </Button>
-            )}
           </div>
           <p className="text-lg text-muted-foreground">
             Explore the manufacturers behind your favorite rides and attractions