feat: remove AI extensions, restructure settings, and add atomic voucher commits (#157)

Remove AI-dependent extensions (ai-chat, ai-categorization, receipt-ocr,
invoice-inbox) and their infrastructure (lib/ai/*, ai-consent, LangChain/
Anthropic/OpenAI deps) to simplify core and reduce bundle size.

Restructure monolithic settings page into dedicated sub-pages (company,
bookkeeping, invoicing, tax, banking, api, account, team, templates) with
shared layout and sidebar navigation.

Add atomic commit_journal_entry RPC so voucher number increment and status
update happen in a single transaction — prevents burned numbers on constraint
failures. Add continuity check report and voucher gap explanation tracking.

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

components/transactions/SwipeCategorizationView.tsx

@@ -21,7 +21,6 @@ import DescribeTransactionDialog from './DescribeTransactionDialog'
 import { formatAccountWithName } from '@/lib/bookkeeping/client-account-names'
 import type { TransactionCategory, VatTreatment, BASAccount, EntityType } from '@/types'
 import type { SuggestedCategory, SuggestedTemplate } from '@/lib/transactions/category-suggestions'
-import { ENABLED_EXTENSION_IDS } from '@/lib/extensions/_generated/enabled-extensions'
 import type { TransactionWithInvoice, CategorizeHandler, MatchInvoiceHandler } from './transaction-types'
 import { EXPENSE_CATEGORIES, INCOME_CATEGORIES, VAT_TREATMENT_OPTIONS } from './transaction-types'
 
@@ -848,18 +847,16 @@ export default function SwipeCategorizationView({
             </div>
           )}
 
-          {/* Describe transaction button — only when AI categorization is enabled */}
-          {ENABLED_EXTENSION_IDS.has('ai-categorization') && (
-            <Button
-              variant="outline"
-              className="w-full"
-              onClick={() => setShowDescribeDialog(true)}
-              disabled={isProcessing}
-            >
-              <MessageSquareText className="mr-2 h-4 w-4" />
-              Beskriv transaktion...
-            </Button>
-          )}
+          {/* Describe transaction button */}
+          <Button
+            variant="outline"
+            className="w-full"
+            onClick={() => setShowDescribeDialog(true)}
+            disabled={isProcessing}
+          >
+            <MessageSquareText className="mr-2 h-4 w-4" />
+            Beskriv transaktion...
+          </Button>
 
           {/* Categorization button */}
           <Button