Rename 'iban' to 'ownerIBAN' in UserSettings

Changes:
- Updated UserSettings interface: iban -> ownerIBAN
- Updated userSettingsActions.ts:
  - Changed State type to use ownerIBAN
  - Updated FormSchema validation to reference ownerIBAN
  - Updated validation refinements to check ownerIBAN
  - Updated form data parsing to read ownerIBAN
  - Renamed normalizedIban to normalizedOwnerIBAN
  - Updated database write operations to use ownerIBAN
- Updated UserSettingsForm.tsx:
  - Changed state tracking to use ownerIBAN
  - Updated validation check to reference ownerIBAN (cleanedOwnerIBAN)
  - Updated input field: id, name, and event handlers
- Updated ViewLocationCard.tsx to use ownerIBAN instead of iban
- Updated English translations:
  - iban-label -> owner-iban-label
  - iban-placeholder -> owner-iban-placeholder
  - iban-required -> owner-iban-required
  - iban-invalid -> owner-iban-invalid
- Updated Croatian translations with corresponding ownerIBAN keys

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

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

messages/hr.json

@@ -194,8 +194,8 @@
     "owner-street-placeholder": "unesite ulicu i kućni broj",
     "owner-town-label": "Poštanski broj i Grad",
     "owner-town-placeholder": "unesite poštanski broj i grad",
-    "iban-label": "IBAN",
-    "iban-placeholder": "unesite svoj IBAN",
+    "owner-iban-label": "IBAN",
+    "owner-iban-placeholder": "unesite svoj IBAN",
     "currency-label": "Valuta",
     "save-button": "Spremi",
     "cancel-button": "Odbaci",
@@ -203,8 +203,8 @@
       "owner-name-required": "Ime i prezime je obavezno",
       "owner-street-required": "Ulica je obavezna",
       "owner-town-required": "Grad je obavezan",
-      "iban-required": "Ispravan IBAN je obavezan",
-      "iban-invalid": "Neispravan IBAN format. Molimo unesite ispravan IBAN.",
+      "owner-iban-required": "Ispravan IBAN je obavezan",
+      "owner-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."
     },