feat: integrate login/registration into PurchaseWizard

package.json

@@ -31,6 +31,7 @@
     "dependencies": {
         "@headlessui/react": "^2.2.0",
         "@inertiajs/react": "^2.1.0",
+        "@paypal/react-paypal-js": "^8.9.2",
         "@playwright/mcp": "^0.0.37",
         "@radix-ui/react-accordion": "^1.2.12",
         "@radix-ui/react-avatar": "^1.1.10",
@@ -72,6 +73,7 @@
         "lucide-react": "^0.475.0",
         "react": "^19.0.0",
         "react-dom": "^19.0.0",
+        "react-hot-toast": "^2.6.0",
         "react-i18next": "^16.0.0",
         "react-router-dom": "^7.8.2",
         "tailwind-merge": "^3.0.1",