Add town and currency fields to user settings

Adds two new fields to user settings form:
- Town field: Text input for city/town (required when 2D code enabled)
- Currency field: Select dropdown with ISO 4217 currency codes (EUR default)

Updates:
- Database schema: Added town and currency fields to UserSettings
- Validation: Both fields required when 2D code is enabled
- Form UI: Added input fields with proper validation and error handling
- Translations: Added Croatian and English labels and error messages
- Currency options: 36 ISO 4217 codes with EUR at top as default

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

messages/en.json

@@ -192,16 +192,21 @@
     "last-name-placeholder": "Enter your last name",
     "street-label": "Street",
     "street-placeholder": "Enter your street",
+    "town-label": "Town",
+    "town-placeholder": "Enter your town",
     "iban-label": "IBAN",
     "iban-placeholder": "Enter your IBAN",
+    "currency-label": "Currency",
     "save-button": "Save",
     "cancel-button": "Cancel",
     "validation": {
       "first-name-required": "First name is mandatory",
       "last-name-required": "Last name is mandatory",
       "street-required": "Street is mandatory",
+      "town-required": "Town is mandatory",
       "iban-required": "Valid IBAN is mandatory",
       "iban-invalid": "Invalid IBAN format. Please enter a valid IBAN",
+      "currency-required": "Currency is mandatory",
       "validation-failed": "Validation failed. Please check the form and try again."
     },
     "additional-notes": "Note: For the 2D code to be displayed, you must enter both the tenant's first and last names in the settings of each property for which you want to use this functionality."

messages/hr.json

@@ -191,16 +191,21 @@
     "last-name-placeholder": "Unesite svoje prezime",
     "street-label": "Ulica",
     "street-placeholder": "Unesite ulicu",
+    "town-label": "Grad",
+    "town-placeholder": "Unesite grad",
     "iban-label": "IBAN",
     "iban-placeholder": "Unesite svoj IBAN",
+    "currency-label": "Valuta",
     "save-button": "Spremi",
     "cancel-button": "Odbaci",
     "validation": {
       "first-name-required": "Ime je obavezno",
       "last-name-required": "Prezime je obavezno",
       "street-required": "Ulica je obavezna",
+      "town-required": "Grad je obavezan",
       "iban-required": "Ispravan IBAN je obavezan",
       "iban-invalid": "Neispravan IBAN format. Molimo unesite ispravan IBAN.",
+      "currency-required": "Valuta je obavezna",
       "validation-failed": "Validacija nije uspjela. Molimo provjerite formu i pokušajte ponovno."
     },
     "additional-notes": "Napomena: da bi 2D koda bio prikazan, morate unijeti i ime i prezime podstanara u postavkama svake nekretnine za koju želite koristiti ovu funkcionalnost."