- Rename billFwd* to billsNotification* for clarity
- Rename rentDueNotification* to rentNotification* for consistency
- Rename utilBillsProofOfPayment to billsProofOfPayment
- Introduce enums for type safety:
- BillsNotificationStrategy (WhenPayed, WhenAttached)
- BillsNotificationStatus (Scheduled, Sent, Failed)
- RentNotificationStatus (Sent, Failed)
- Replace "pending" status with "scheduled" for better semantics
- Fix function names to proper camelCase
- Fix incorrect import path in web-app/app/lib/format.ts
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>