fix(providers): map Fortnox VAT-inclusive rows net of VAT, and refuse migrated rows that contradict their header (#2302)

The first production run of the row-completion pass (#2291) wrote 345
Profilio invoices whose rows summed to the invoice GROSS with 25 % VAT
computed on top, beside a header (Net / TotalVAT) that was right. Fortnox
prices an invoice either excluding or including VAT and says which with
the invoice-level VATIncluded flag; the mapper had always read the row
Total and Price as net. Every such row set is 1.25 x its header net, to
the öre, across all 345.

- lib/providers/fortnox/mapper.ts: netOfVat() divides row Total and Price
  by (1 + rate) when VATIncluded is true; TotalExcludingVAT and
  PriceExcludingVAT are preferred when the payload carries them. A row
  without a rate cannot be split and keeps its amount.
- complete-invoice-lines.ts: rows whose net or VAT disagree with the header
  the same payload established by more than 1 kr are reported as
  rowsMismatch and left untouched. Öresavrundning stays inside the
  tolerance; VAT-inside rows, header-level freight and discounts do not.
  Rows that contradict their own header are worse than no rows.
- Cron summary carries rowsMismatch.

None of the 345 is open or booked; a separate repair removes today's rows
for them so the fixed pass refills them.


Claude-Session: https://claude.ai/code/session_01DG5aYcshzKJ1EA7PPhGtVf

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5.1 <noreply@anthropic.com>

app/api/extensions/arcim-migration/complete-invoice-lines/cron/__tests__/route.test.ts

@@ -44,7 +44,7 @@ const mockComplete = vi.mocked(completeMigratedInvoiceLines)
 
 const EMPTY = {
   candidates: 0, providerInvoices: 0, matched: 0, unmatched: 0, completed: 0, headersUpdated: 0,
-  totalMismatch: 0, noLinesAtProvider: 0, notHydrated: 0, vatUnresolved: 0, failed: 0, remaining: 0,
+  totalMismatch: 0, noLinesAtProvider: 0, rowsMismatch: 0, notHydrated: 0, vatUnresolved: 0, failed: 0, remaining: 0,
   hydration: { needed: 0, hydrated: 0, failed: 0, skippedForBudget: 0 }, dryRun: false,
 }
 

app/api/extensions/arcim-migration/complete-invoice-lines/cron/route.ts

@@ -116,6 +116,7 @@ export const GET = withCronContext('cron.arcim_migration_complete_invoice_lines'
     remaining: 0,
     notHydrated: 0,
     totalMismatch: 0,
+    rowsMismatch: 0,
     failed: 0,
   }
 
@@ -141,6 +142,7 @@ export const GET = withCronContext('cron.arcim_migration_complete_invoice_lines'
       totals.remaining += result.remaining
       totals.notHydrated += result.notHydrated
       totals.totalMismatch += result.totalMismatch
+      totals.rowsMismatch += result.rowsMismatch
       totals.failed += result.failed
       itemCtx.log.info('migrated invoice rows completed for company', {
         companyId: consent.company_id,
@@ -151,6 +153,7 @@ export const GET = withCronContext('cron.arcim_migration_complete_invoice_lines'
         remaining: result.remaining,
         notHydrated: result.notHydrated,
         totalMismatch: result.totalMismatch,
+        rowsMismatch: result.rowsMismatch,
         hydration: result.hydration,
       })
     }