Add _fix_ocr_dollar_as_8() which strips a spurious leading '8' when it
sits at a word boundary before a non-zero digit + 1–3 more digits + .dd
(covers $10–$9999). Applied at the top of _extract_amount_from_text so
both the labeled-total pass and the max-scan pass benefit.
845.00 → 45.00 ($45 misread as 845)
885.00 → 85.00 ($85 misread as 885)
8150.00 → 150.00 ($150 misread as 8150)
85.00 → 85.00 UNCHANGED (real $85 correctly read)
8.50 → 8.50 UNCHANGED (real $8.50 correctly read)
12 new tests covering fix cases, non-fix cases, and end-to-end extraction
(110 tests total, all passing).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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