Rename firstName to ownerName with updated validation

- Renamed firstName to ownerName in UserSettings interface
- Updated UserSettingsForm field to accept full name (first and last)
- Set maximum length to 25 characters for owner name field
- Updated all database operations to use ownerName
- Changed English label from "First Name" to "Your First and Last Name"
- Updated Croatian translations to match (Vaše ime i prezime)
- Updated form validation schema and error messages
- Removed old lastName-related translations
- Updated ViewLocationCard to use ownerName for recipient

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

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

app/ui/ViewLocationCard.tsx

@@ -28,7 +28,7 @@ export const ViewLocationCard:FC<ViewLocationCardProps> = ({location, userSettin
         ImePlatitelja: tenantName ?? "",
         AdresaPlatitelja: tenantStreet ?? "",
         SjedistePlatitelja: tenantTown ?? "",
-        Primatelj: userSettings?.firstName ?? "",
+        Primatelj: userSettings?.ownerName ?? "",
         AdresaPrimatelja: userSettings?.street ?? "",
         SjedistePrimatelja: userSettings?.town ?? "",
         IBAN: userSettings?.iban ?? "",