- Add rentAmount field to BillingLocation interface (stored in cents)
- Implement Zod validation with conditional requirement when rent notification is enabled
- Add rent amount input field to LocationEditForm with decimal display
- Update all database operations to persist rentAmount
- Add localization strings for both English and Croatian
- Fix missing notes field in insertOne/insertMany operations
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Co-Authored-By: Claude <noreply@anthropic.com>
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