- Add rentDueNotification toggle to enable automatic rent notifications
- Add rentDueDay selector (1-28) for specifying when rent is due
- Extract tenant email to independent section shown when either autoBillFwd or rentDueNotification is enabled
- Update email validation to be mandatory when any automatic notification is active
- Update database schema to persist rentDueNotification and rentDueDay fields
- Add all database operations to handle new fields with proper defaults
- Add localization strings for English and Croatian
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Co-Authored-By: Claude <noreply@anthropic.com>
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