Rename 'town' to 'ownerTown' in UserSettings with 27 character max length

Changes:
- Updated UserSettings interface: town -> ownerTown
- Updated userSettingsActions.ts:
  - Changed State type to use ownerTown
  - Added max length validation (27 characters) to FormSchema
  - Updated validation refinement to check ownerTown
  - Updated form data parsing to read ownerTown
  - Updated database write operations to use ownerTown
- Updated UserSettingsForm.tsx:
  - Changed state tracking to use ownerTown
  - Updated validation check to reference ownerTown
  - Updated input field: id, name, maxLength={27}
- Updated ViewLocationCard.tsx to use ownerTown instead of town
- Updated English translations:
  - town-label -> owner-town-label: "Your Postal Code and Town"
  - town-placeholder -> owner-town-placeholder
  - town-required -> owner-town-required
- Updated Croatian translations with corresponding ownerTown keys

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

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

messages/en.json

@@ -193,8 +193,8 @@
     "owner-name-placeholder": "enter your first and last name",
     "owner-street-label": "Your Street and House Number",
     "owner-street-placeholder": "enter your street and house number",
-    "town-label": "Town",
-    "town-placeholder": "enter your town",
+    "owner-town-label": "Your Postal Code and Town",
+    "owner-town-placeholder": "enter your postal code and town",
     "iban-label": "IBAN",
     "iban-placeholder": "enter your IBAN",
     "currency-label": "Currency",
@@ -203,7 +203,7 @@
     "validation": {
       "owner-name-required": "Name is mandatory",
       "owner-street-required": "Street is mandatory",
-      "town-required": "Town is mandatory",
+      "owner-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",