Closes the remaining type/sub-type-consistency vector (create/edit + IIF
were already covered). The sign convention keys off sub-type, so a
mismatched pair posts with the wrong debit/credit sign.
- New AccountClassification.DefaultSubTypeForType(type).
- QBO import: QBO Type is reliable but DetailType frequently isn't
mappable and fell back to AccountSubType.Other (an expense-range sub-type)
— so an unmapped Liability/Equity/Revenue account would have posted
debit-normal. Now reconciles the sub-type to the type when they disagree.
- CSV import: type and sub-type came from independent columns; now derives
the type from the sub-type (sub-type authoritative, matching create/edit).
- IIF import already returns consistent (type, sub-type) tuples — unchanged.
Build clean; 293 unit tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
spouliot
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