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A user with a September-to-August fiscal year could not sign off 1930: the dialog let them press Signera, the server refused, and the dialog showed "Något gick fel. Försök igen." Three defects, one flow: - signOffAccount judged a bank account over the calendar year from 1 January (the getAccountStatus default) while the page the signer looked at was scoped to the fiscal period. The sign-off now resolves the fiscal period covering through_date and judges from its start, for every caller (dashboard, v1, MCP, pending-operation executor). - The dialog decided whether the "sign anyway" override was needed from the page tile, which can be scoped to a narrower range. It now previews the exact sign-off with dry_run on open and on every date change, and NOT_RECONCILED carries the unexplained amount in details so the warning can name it. - The routes passed the refusal through getErrorMessage(), which did not know the sign-off codes and replaced the Swedish text with its generic fallback. The codes are now in the structured error registry with a thrown_message_sv flag: the mapper passes the thrower's text (dates, amounts) through verbatim and English users get message_en. Claude-Session: https://claude.ai/code/session_01YDH3nqA8QtMA8WKTKZCMsA Signed-off-by: Emil <emilmattsson14@gmail.com> Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>