Enhanced receipt parsing and mapping to support bills with due dates (like utility bills):
- Updated OpenAI prompt to extract due date from bills
- Added DueDate property to Receipt model with database migration
- Modified auto-mapping logic to use bill date to due date range when both dates are present
- For regular receipts without due dates, continues to use ±3 day window
- Updated manual mapping UI to display due dates and adjust date range explanation
- Receipt list now shows due dates in orange "Due:" text for clarity
This allows electric bills and similar documents with 20+ day payment windows to be properly matched to their payment transactions.
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Co-Authored-By: Claude <noreply@anthropic.com>