Adds YnabImport (mirroring ActualImport) for YNAB "Export budget" register CSVs:
- Amount — combines the split Outflow/Inflow columns into a single signed amount
(inflow - |outflow|), stripping currency symbols and thousands separators. A
single signed Amount column takes precedence when present.
- Category — resolves across export shapes: the combined "Category Group/Category"
column, the split "Category Group" + "Category", or legacy YNAB 4
"Master Category" + "Sub Category".
- Names — falls back from a blank Payee to the Memo, then the default row name.
- Validation — requires at least one amount source (Outflow/Inflow or Amount); a
file exposing none leaves rows un-clean instead of importing zero-dollar entries.
Enables the previously-disabled YNAB option on the imports screen (using the YNAB
logo, like Mint) with its configuration partial, and removes the now-dead
imports.new.coming_soon locale key. Documents the type in the API import-type
enums (rswag request spec + swagger_helper + generated openapi.yaml).
Closes#1255.
6ea931f3fe