Implemented full server-side persistence for the billedToTenant property:
- Extract billedToTenant from formData in updateOrAddBill action
- Add to MongoDB $set operations for updating existing bills
- Include in new bill creation with value from form
- Set default value (true) for bills added to subsequent months
- Handle undefined values from existing database records using destructuring defaults
This completes the feature - bills can now track whether they should be
paid by the tenant, with backward compatibility for existing data.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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