feat: Complete checkout overhaul with Stripe PaymentIntent integration and abandoned cart recovery

public/lang/en/auth.json

@@ -1,10 +1,71 @@
 {
+  "header": {
+    "home": "Home",
+    "packages": "Packages",
+    "blog": "Blog",
+    "occasions": {
+      "wedding": "Wedding",
+      "birthday": "Birthday",
+      "corporate": "Corporate Event"
+    },
+    "contact": "Contact",
+    "login": "Login",
+    "register": "Register"
+  },
   "login_failed": "Invalid email or password.",
   "login_success": "You are now logged in.",
   "registration_failed": "Registration failed.",
   "registration_success": "Registration successful – proceed with purchase.",
   "already_logged_in": "You are already logged in.",
   "failed_credentials": "Invalid credentials.",
-  "header.login": "Login",
-  "header.register": "Register"
+  "login": {
+    "title": "Login",
+    "username_or_email": "Username or Email",
+    "password": "Password",
+    "remember": "Remember me",
+    "submit": "Login"
+  },
+  "register": {
+    "title": "Register",
+    "name": "Full Name",
+    "username": "Username",
+    "username_placeholder": "Choose a username",
+    "email": "Email Address",
+    "email_placeholder": "your@email.com",
+    "password": "Password",
+    "password_placeholder": "At least 8 characters",
+    "password_confirmation": "Confirm Password",
+    "confirm_password": "Confirm Password",
+    "confirm_password_placeholder": "Repeat password",
+    "first_name": "First Name",
+    "first_name_placeholder": "John",
+    "last_name": "Last Name",
+    "last_name_placeholder": "Doe",
+    "address": "Address",
+    "address_placeholder": "Street Number, ZIP City",
+    "phone": "Phone Number",
+    "phone_placeholder": "+1 123 456789",
+    "privacy_consent": "I agree to the privacy policy and accept the processing of my personal data.",
+    "privacy_policy": "Privacy Policy",
+    "submit": "Register",
+    "success_toast": "Registration successful",
+    "validation_failed": "Please check your input.",
+    "unexpected_error": "Registration not possible.",
+    "errors_title": "Registration errors",
+    "errors": {
+      "username": "Username",
+      "email": "Email",
+      "password": "Password",
+      "password_confirmation": "Password Confirmation",
+      "first_name": "First Name",
+      "last_name": "Last Name",
+      "address": "Address",
+      "phone": "Phone",
+      "privacy_consent": "Privacy Consent"
+    }
+  },
+  "verification": {
+    "notice": "Please confirm your email address.",
+    "resend": "Resend email"
+  }
 }