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/extensions/general/InvoiceInboxWorkspace.tsx

@@ -87,10 +87,12 @@ export default function InvoiceInboxWorkspace({ userId }: WorkspaceComponentProp
     fetchSuppliers()
   }, [fetchItems, fetchSettings, fetchSuppliers])
 
-  function handleUploadComplete(newItem: InvoiceInboxItem) {
-    setItems((prev) => [newItem, ...prev])
-    // Poll for processing completion
-    pollItem(newItem.id)
+  function handleUploadComplete(result: InvoiceInboxItem | InvoiceInboxItem[]) {
+    const newItems = Array.isArray(result) ? result : [result]
+    setItems((prev) => [...newItems, ...prev])
+    for (const item of newItems) {
+      pollItem(item.id)
+    }
   }
 
   async function pollItem(itemId: string) {