feat(accounting): move Chart of accounts into Settings → Accounting

Consolidate all accounting configuration in one place. The Chart of
accounts (accounts table + category/default-account mappings) becomes a
self-contained ChartOfAccountsManager rendered in Settings → Accounting,
next to the VAT codes that already moved there. The /admin/accounting
section is now purely operational (Incoming invoices · Expenses · Tax).

The old /admin/accounting/ledger route redirects to the settings tab so
bookmarks keep working; the Tax page "Configure" link points there too.
ChartOfAccountsManager saves only the account keys (partial-merge safe,
same as VatCodesManager), so the two never revert each other's edits.

frontend/src/App.tsx

@@ -69,7 +69,6 @@ import { ClientsLayout } from './components/admin/ClientsLayout';
 import { AccountingLayout, AccountingIndex } from './components/admin/AccountingLayout';
 import { AccountingInboxPage } from './pages/admin/accounting/AccountingInboxPage';
 import { ExpensesLedgerPage } from './pages/admin/accounting/ExpensesLedgerPage';
-import { ChartOfAccountsPage } from './pages/admin/accounting/ChartOfAccountsPage';
 import { RequireFeature } from './components/admin/RequireFeature';
 import { PageErrorBoundary, OfflineIndicator, SkipLink, DynamicFavicon, RobotsMetaTags, CMSContentBlock, Loading } from './components/common';
 import { MaintenanceWrapper } from './components/MaintenanceWrapper';
@@ -291,9 +290,9 @@ function App() {
                                 the old path working for bookmarks. */}
                             <Route path="export" element={<Navigate to="/admin/accounting/tax-report" replace />} />
                           </Route>
-                          {/* Chart of accounts + VAT codes (Layer A) — gated by
+                          {/* Chart of accounts (Layer A) moved into Settings →
-                              the accounting master flag alongside the section. */}
+                              Accounting; keep the old path working for bookmarks. */}
-                          <Route path="ledger" element={<ChartOfAccountsPage />} />
+                          <Route path="ledger" element={<Navigate to="/admin/settings?tab=accounting" replace />} />
                           <Route index element={<AccountingIndex />} />
                         </Route>
                       </Route>

frontend/src/components/admin/AccountingLayout.tsx

@@ -9,7 +9,7 @@
 import React from 'react';
 import { NavLink, Outlet, Navigate, useLocation, useNavigate } from 'react-router-dom';
 import { useTranslation } from 'react-i18next';
-import { Landmark, Calculator, Inbox, Wallet, BookOpen } from 'lucide-react';
+import { Landmark, Calculator, Inbox, Wallet } from 'lucide-react';
 import type { LucideIcon } from 'lucide-react';
 import { useFeatureFlags, type FeatureKey } from '../../contexts/FeatureFlagsContext';
 
@@ -52,13 +52,8 @@ export const AccountingLayout: React.FC = () => {
       icon: Calculator,
       featureFlag: 'taxReport',
     },
-    {
+    // Chart of accounts moved to Settings → Accounting (all accounting config
-      key: 'ledger',
+    // lives there now); this section keeps only the operational pages.
-      to: '/admin/accounting/ledger',
-      label: t('accounting.subnav.chartOfAccounts', 'Chart of accounts'),
-      icon: BookOpen,
-      featureFlag: 'accounting',
-    },
     // Future: Erfolgsrechnung (Layer B).
   ];
 

frontend/src/components/admin/ChartOfAccountsManager.tsx

@@ -1,23 +1,27 @@
 /**
- * Accounting → Chart of accounts (Layer A).
+ * Chart of accounts manager (Layer A) — embedded in Settings → Accounting.
  *
  * Full CRUD for the Swiss/LI KMU-Kontenrahmen accounts, plus the mappings the
  * Treuhänder export relies on: which account each expense category books to and
- * the default/system accounts. VAT codes + their rate/treatment maps live in
+ * the default/system accounts. Sits alongside VatCodesManager so all accounting
- * Settings → Accounting (VatCodesManager), so all VAT config sits in one place.
+ * configuration lives in one place.
  *
  * This data drives the export only — picpeak is not a double-entry ledger.
+ *
+ * NOTE: ledgerService.updateSettings is a PARTIAL merge, so this component saves
+ * ONLY the account keys (SETTING_ACCOUNT_KEYS); the VAT maps are owned by
+ * VatCodesManager. Scoping each patch keeps the two from reverting each other.
  */
 import React, { useEffect, useMemo, useState } from 'react';
 import { useQuery, useMutation, useQueryClient } from '@tanstack/react-query';
 import { useTranslation } from 'react-i18next';
 import { toast } from 'react-toastify';
 import { X, Plus, Pencil, Trash2, AlertCircle } from 'lucide-react';
-import { Button, Card, CardContent, Input, Loading } from '../../../components/common';
+import { Button, Card, CardContent, Input, Loading } from '../common';
 import {
   ledgerService, type LedgerAccount, type AccountType, type LedgerSettings,
-} from '../../../services/ledger.service';
+} from '../../services/ledger.service';
-import { categoryLabel } from '../../../services/accounting.service';
+import { categoryLabel } from '../../services/accounting.service';
 
 const ACCOUNT_TYPES: AccountType[] = ['asset', 'liability', 'equity', 'revenue', 'expense'];
 const labelCls = 'block text-xs font-medium text-neutral-700 dark:text-neutral-300 mb-1';
@@ -65,7 +69,7 @@ const AccountModal: React.FC<{ account?: LedgerAccount; onClose: () => void; onD
   );
 };
 
-export const ChartOfAccountsPage: React.FC = () => {
+export const ChartOfAccountsManager: React.FC = () => {
   const { t } = useTranslation();
   const qc = useQueryClient();
   const [accountModal, setAccountModal] = useState<{ account?: LedgerAccount } | null>(null);
@@ -73,7 +77,7 @@ export const ChartOfAccountsPage: React.FC = () => {
   const { data: accounts, isLoading: la } = useQuery({ queryKey: ['ledger-accounts'], queryFn: () => ledgerService.listAccounts() });
   const { data: mappings, isLoading: lm } = useQuery({ queryKey: ['ledger-mappings'], queryFn: () => ledgerService.getMappings() });
 
-  // Local editable copy of the settings (default accounts + VAT maps).
+  // Local editable copy of the settings (default/system accounts only).
   const [settings, setSettings] = useState<LedgerSettings>({});
   useEffect(() => { if (mappings?.settings) setSettings(mappings.settings); }, [mappings?.settings]);
 
@@ -91,9 +95,9 @@ export const ChartOfAccountsPage: React.FC = () => {
     onSuccess: () => { qc.invalidateQueries({ queryKey: ['ledger-mappings'] }); },
     onError: (e: any) => toast.error(e?.response?.data?.error || e.message || 'Failed'),
   });
-  // Save ONLY the account keys — the VAT maps now live in Settings → Accounting
+  // Save ONLY the account keys — the VAT maps are owned by VatCodesManager and
-  // (VatCodesManager) and updateSettings is a partial merge, so scoping the
+  // updateSettings is a partial merge, so scoping the patch here prevents a
-  // patch here prevents a stale full-settings save from reverting the maps.
+  // stale full-settings save from reverting the maps.
   const saveSettings = useMutation({
     mutationFn: () => {
       const patch: Partial<LedgerSettings> = {};
@@ -197,4 +201,4 @@ export const ChartOfAccountsPage: React.FC = () => {
   );
 };
 
-export default ChartOfAccountsPage;
+export default ChartOfAccountsManager;

frontend/src/features/settings/tabs/AccountingTab.tsx

@@ -13,6 +13,7 @@ import { DecimalInput } from '../../../components/common/DecimalInput';
 import { accountingService } from '../../../services/accounting.service';
 import { sortedCountryOptions } from '../../../constants/countries';
 import { VatCodesManager } from '../../../components/admin/VatCodesManager';
+import { ChartOfAccountsManager } from '../../../components/admin/ChartOfAccountsManager';
 
 const labelCls = 'block text-sm font-medium text-neutral-700 dark:text-neutral-300 mb-1';
 const inputCls = 'w-full max-w-xs rounded-md border border-neutral-300 dark:border-neutral-600 bg-white dark:bg-neutral-800 px-3 py-2 text-sm';
@@ -121,6 +122,16 @@ export const AccountingTab: React.FC = () => {
       {/* VAT codes + rate→code / treatment→code maps — relocated here from the
           Chart-of-accounts page so all VAT config lives in one place. */}
       <VatCodesManager />
+
+      {/* Chart of accounts (accounts + category/default-account mappings) —
+          moved off the /admin/accounting section so all accounting config is
+          here; the section keeps only the operational pages. */}
+      <div className="pt-2">
+        <h3 className="text-sm font-semibold uppercase tracking-wider text-neutral-500 dark:text-neutral-400 mb-3">
+          {t('ledger.accounts.title', 'Chart of accounts')}
+        </h3>
+        <ChartOfAccountsManager />
+      </div>
     </div>
   );
 };

frontend/src/pages/admin/clients/TaxReportPage.tsx

@@ -346,7 +346,7 @@ export const TaxReportPage: React.FC = () => {
                     </div>
                     <div className="text-[11px] text-neutral-400 dark:text-neutral-500">
                       {t('taxReport.ledgerExportHint', 'Double-entry postings for your accountant, mapped via your Chart of accounts.')}{' '}
-                      <Link to="/admin/accounting/ledger" className="underline hover:text-neutral-600 dark:hover:text-neutral-300">
+                      <Link to="/admin/settings?tab=accounting" className="underline hover:text-neutral-600 dark:hover:text-neutral-300">
                         {t('taxReport.ledgerExportConfigure', 'Configure →')}
                       </Link>
                     </div>