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>

components/ui/account-number.tsx

@@ -15,6 +15,7 @@ const TYPE_COLORS: Record<AccountType, string> = {
   equity: 'bg-blue-500',
   revenue: 'bg-purple-500',
   expense: 'bg-red-500',
+  untaxed_reserves: 'bg-amber-500',
 }
 
 const TYPE_LABELS: Record<AccountType, string> = {
@@ -23,6 +24,7 @@ const TYPE_LABELS: Record<AccountType, string> = {
   equity: 'Eget kapital',
   revenue: 'Intäkt',
   expense: 'Kostnad',
+  untaxed_reserves: 'Obeskattade reserver',
 }
 
 interface AccountNumberProps {