perf(reference-data): sweep the remaining raw reads onto the session cache, ratchet to 0 (#1941)

Final consumer migration of the responsiveness plan: the 35 files still
fetching fiscal periods, settings, accounts, cash accounts, dimensions or
templates on their own now read lib/reference-data, and every client
write site invalidates the shared cache instead of refetching locally.

Settings and registries: FiscalYearsManager, FiscalPeriodEditor (period
snapshotted once per company so a revalidation cannot reset dates being
edited), BookingTemplatesPanel, ChartOfAccounts, ChartOfAccountsManager,
EditAccountDialog, CorrectionEntryDialog, StrikeLinesDialog,
InvoicePaymentAccountsSettings; the dimensions registry (DimensionsManager,
DimensionCombobox, LineDimensionFields, DimensionFilter, bookkeeping/[id])
reads useDimensions and the ad-hoc fetchDimensions/fetchDimensionsCached
helpers are deleted.

Pages and pickers: CashAccountSelector (FyPicker-shaped restore, once per
company load), use-account-names, FiscalYearGapNotice,
OpeningBalancePeriodStep, BankFileConfirmStep, ImportReviewStep, the import
page (invalidates accounts + periods after a SIE execute), customers list,
invoices list + detail, pending, salary employee, asset dispose, year-end
and periodisering pages (invalidate periods after closing), reports
DimensionPnlView (its pivot picker read the wrong payload key and was
always empty; it now populates), SkatteverketPanel, TemplatePicker,
ArticleForm (vat_registered).

Invoice dialogs and extensions: SendInvoiceDialog, PaymentBookingDialog
(init reduced to the credit-note lookup + catalogue, proposal and voucher
preview fire on open when cached; a local getSession replaces the network
getUser for the fallback CC), InvoiceInboxWorkspace, TicWorkspace,
ArcimMigrationWorkspace (invalidates after each SIE import step),
enable-banking AccountPickerDialog.

raw-reference-fetch ratchet: 35 -> 0 files.

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

components/extensions/general/InvoiceInboxWorkspace.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useState, useCallback, useEffect, useRef, useMemo } from 'react'
+import { useCompanySettings } from '@/lib/reference-data/hooks'
 import { useTranslations } from 'next-intl'
 import { Badge } from '@/components/ui/badge'
 import { Button } from '@/components/ui/button'
@@ -391,7 +392,11 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
   // Cash method users see "Bokför direkt" as the primary CTA; accrual users
   // see "Skapa leverantörsfaktura". Defaults to 'accrual' until we've read
   // the company settings so we don't flicker the CTA order on first paint.
-  const [accountingMethod, setAccountingMethod] = useState<AccountingMethod>('accrual')
+  // The company's bookkeeping method drives the CTA hierarchy; read from the
+  // session-cached settings row (lib/reference-data), no request of its own.
+  const { settings: companySettings } = useCompanySettings()
+  const accountingMethod: AccountingMethod =
+    companySettings?.accounting_method === 'cash' ? 'cash' : 'accrual'
 
   // ── Data loading ───────────────────────────────────────────
 
@@ -451,16 +456,6 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
   useEffect(() => {
     fetchItems()
     fetchInboxAddress()
-    // Resolve the company's bookkeeping method: drives CTA hierarchy.
-    fetch('/api/settings')
-      .then((r) => (r.ok ? r.json() : null))
-      .then((body) => {
-        const method = body?.data?.accounting_method
-        if (method === 'cash' || method === 'accrual') {
-          setAccountingMethod(method)
-        }
-      })
-      .catch(() => { /* keep 'accrual' default */ })
   }, [fetchItems, fetchInboxAddress])
 
   // Realtime: refetch when any invoice_inbox_items row changes for this