Enhance add-to-cart toast

Styled the added-to-cart toast with bold green/brand background and white text, including a green visual emphasis and a persistent View Cart action button.

X-Lovable-Edit-ID: edt-940666bd-9011-493b-a9fb-b671b45a4e4e
Co-authored-by: CyberTechDroid <229118619+CyberTechDroid@users.noreply.github.com>

src/components/ProductCard.tsx

@@ -24,8 +24,9 @@ export function ProductCard({ product }: ProductCardProps) {
     toast({
       title: '✓ Added to cart',
       description: product.name,
+      className: 'bg-green-600 text-white border-green-700 [&>div]:text-white',
       action: (
-        <Button size="sm" variant="outline" onClick={() => setIsCartOpen(true)}>
+        <Button size="sm" variant="outline" className="border-white text-white hover:bg-white/20 hover:text-white" onClick={() => setIsCartOpen(true)}>
           View Cart
         </Button>
       ),