Implemented IBAN formatting to display with proper spacing:
- Added formatIban() utility function in formatStrings.ts
- Format: Groups of 4 characters separated by spaces (e.g., HR12 3456 7890 1234 5678 9)
- Applied formatting to IBAN field display in AccountForm
- Updated validation to check cleaned IBAN (without spaces)
- Maintains backward compatibility with server-side validation
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Co-Authored-By: Claude <noreply@anthropic.com>