Created shared billForwardingHelpers module to avoid code duplication and
implemented automatic bill forwarding trigger in the multi-bill-edit feature.
Changes:
- Extract shouldUpdateBillFwdStatusWhenAttached and shouldUpdateBillFwdStatusWhenPayed
to new billForwardingHelpers.ts module
- Update billActions.ts to import from shared module instead of local definitions
- Add forwarding logic to monthActions.updateMonth to set billFwdStatus to "pending"
when all tenant bills are marked as paid
This ensures consistent bill forwarding behavior whether updating bills individually
or in bulk via the multi-bill-edit page.
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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