feat: unified document inbox, full BAS 2026, and document-transaction matching

- Expand BAS reference from ~180 to ~1,276 accounts (full BAS Kontoplan 2026)
  with K2 exclusion flags, per-class data files, and computed SRU codes
- Evolve invoice inbox into unified document inbox handling invoices, receipts,
  and government letters with AI-powered classification (Claude Haiku Vision)
- Add multi-pass document-to-transaction matching engine with greedy assignment
  for both supplier invoices (reference/amount/date/name) and receipts
  (weighted amount/merchant/date scoring)
- Add supplier invoice matching in transaction ingest pipeline
- Inject booking template suggestions into AI extraction prompts
- Surface matched documents in swipe categorization UI with one-tap booking
- Auto-activate missing BAS accounts during SIE import against full reference
- Add K2 filter toggle in Chart of Accounts manager
- Add receipt confirmation route with BFNAR representation fields
- Add database migrations for K2 support and document matching columns
- Remove obsolete extension migration scripts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/extensions/sectors.ts

@@ -72,15 +72,15 @@ export const SECTORS: Sector[] = [
       },
       {
         slug: 'invoice-inbox',
-        name: 'Leverantörsfaktura-inbox',
+        name: 'Dokumentinkorg',
         sector: 'general',
         category: 'import',
         icon: 'Inbox',
         dataPattern: 'manual',
         hasOwnData: true,
-        description: 'Ta emot leverantörsfakturor via e-post eller uppladdning',
+        description: 'Ta emot alla dokument via e-post — fakturor, kvitton och myndighetspost',
         longDescription:
-          'Skicka leverantörsfakturor till en dedikerad e-postadress eller ladda upp manuellt. AI extraherar automatiskt leverantörsdata, belopp och moms. Granska och bekräfta med ett klick för att skapa leverantörsfakturor.',
+          'Skicka alla affärsdokument till en dedikerad e-postadress. AI klassificerar automatiskt dokumenttyp (faktura, kvitto, myndighetspost), extraherar data och matchar mot transaktioner. En inkorg för alla dokument.',
       },
       {
         slug: 'calendar',