Added conditional required validation and format validation for tenant email.
Changes:
- Tenant email is now required when autoTenantNotification is enabled
- Added email format validation using Zod's built-in email validator
- Email field validates format even when autoTenantNotification is off (if not empty)
- Added localization strings for validation errors (Croatian/English)
Validation logic:
- Format validation: Always checks if email is valid format (when not empty)
- Required validation: Email required when autoTenantNotification is true
- Error messages: "email address is invalid" for format, "tenant email is missing" for required
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Co-Authored-By: Claude <noreply@anthropic.com>
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