fix: add required email and country fields to checkout

- Add email field (required) for order confirmation
- Add phone field in contact info section
- Add country dropdown with regional options
- Add validation for email format and required fields
- Add checkoutEmailUpdate mutation call before completing
- Use selected country instead of hardcoded RS
- Add translations for new fields (EN, SR, DE, FR)

src/i18n/messages/de.json

@@ -340,7 +340,12 @@
   },
   "Checkout": {
     "checkout": "Kasse",
+    "contactInfo": "Kontaktinformationen",
+    "email": "E-Mail",
+    "emailRequired": "Erforderlich für Bestellbestätigung",
+    "phoneRequired": "Erforderlich für Lieferkoordination",
     "shippingAddress": "Lieferadresse",
+    "country": "Land",
     "firstName": "Vorname",
     "lastName": "Nachname",
     "streetAddress": "Straße und Nummer",
@@ -364,6 +369,8 @@
     "yourCartEmpty": "Ihr Warenkorb ist leer",
     "continueShopping": "Weiter einkaufen",
     "errorNoCheckout": "Keine aktive Kasse. Bitte versuchen Sie es erneut.",
+    "errorEmailRequired": "Bitte geben Sie eine gültige E-Mail-Adresse ein.",
+    "errorFieldsRequired": "Bitte füllen Sie alle erforderlichen Felder aus.",
     "errorOccurred": "Ein Fehler ist during des Checkouts aufgetreten.",
     "errorCreatingOrder": "Bestellung konnte nicht erstellt werden.",
     "orderConfirmed": "Bestellung bestätigt!",

src/i18n/messages/en.json

@@ -386,7 +386,12 @@
   },
   "Checkout": {
     "checkout": "Checkout",
+    "contactInfo": "Contact Information",
+    "email": "Email",
+    "emailRequired": "Required for order confirmation",
+    "phoneRequired": "Required for delivery coordination",
     "shippingAddress": "Shipping Address",
+    "country": "Country",
     "firstName": "First Name",
     "lastName": "Last Name",
     "streetAddress": "Street Address",
@@ -410,6 +415,8 @@
     "yourCartEmpty": "Your cart is empty",
     "continueShopping": "Continue Shopping",
     "errorNoCheckout": "No active checkout. Please try again.",
+    "errorEmailRequired": "Please enter a valid email address.",
+    "errorFieldsRequired": "Please fill in all required fields.",
     "errorOccurred": "An error occurred during checkout.",
     "errorCreatingOrder": "Failed to create order.",
     "orderConfirmed": "Order Confirmed!",

src/i18n/messages/fr.json

@@ -340,7 +340,12 @@
   },
   "Checkout": {
     "checkout": "Commande",
+    "contactInfo": "Coordonnées",
+    "email": "E-mail",
+    "emailRequired": "Requis pour la confirmation de commande",
+    "phoneRequired": "Requis pour la coordination de livraison",
     "shippingAddress": "Adresse de Livraison",
+    "country": "Pays",
     "firstName": "Prénom",
     "lastName": "Nom",
     "streetAddress": "Rue et Numéro",
@@ -364,6 +369,8 @@
     "yourCartEmpty": "Votre panier est vide",
     "continueShopping": "Continuer les Achats",
     "errorNoCheckout": "Pas de paiement actif. Veuillez réessayer.",
+    "errorEmailRequired": "Veuillez entrer une adresse e-mail valide.",
+    "errorFieldsRequired": "Veuillez remplir tous les champs obligatoires.",
     "errorOccurred": "Une erreur s'est produite lors du paiement.",
     "errorCreatingOrder": "Échec de la création de la commande.",
     "orderConfirmed": "Commande Confirmée!",

src/i18n/messages/sr.json

@@ -386,7 +386,12 @@
   },
   "Checkout": {
     "checkout": "Kupovina",
+    "contactInfo": "Kontakt informacije",
+    "email": "Email",
+    "emailRequired": "Potrebno za potvrdu narudžbine",
+    "phoneRequired": "Potrebno za koordinaciju dostave",
     "shippingAddress": "Adresa za dostavu",
+    "country": "Država",
     "firstName": "Ime",
     "lastName": "Prezime",
     "streetAddress": "Ulica i broj",
@@ -410,6 +415,8 @@
     "yourCartEmpty": "Vaša korpa je prazna",
     "continueShopping": "Nastavi kupovinu",
     "errorNoCheckout": "Nema aktivne korpe. Molimo pokušajte ponovo.",
+    "errorEmailRequired": "Molimo unesite validnu email adresu.",
+    "errorFieldsRequired": "Molimo popunite sva obavezna polja.",
     "errorOccurred": "Došlo je do greške prilikom kupovine.",
     "errorCreatingOrder": "Neuspešno kreiranje narudžbine.",
     "orderConfirmed": "Narudžbina potvrđena!",