feat(expenses): expense claims module (utlägg) (#2145)

Contributed by @joakimhew. Maintainer commits on top: migration re-versioned to 20260904170000 (main's 20260901210000 took the original version), payout batches booked atomically through the create_expense_payout_batch RPC, accounted-api skill regenerated, main merged. Closes #2143.

components/dashboard/DashboardNav.tsx

@@ -9,6 +9,7 @@ import { Button } from '@/components/ui/button'
 import {
   LayoutDashboard,
   Home,
+  Receipt,
   ReceiptText,
   Users,
   ArrowLeftRight,
@@ -137,6 +138,7 @@ type NavLabelKey =
   | 'reports'
   | 'import'
   | 'salary'
+  | 'expenses'
   | 'mileage'
   | 'employees'
   | 'vat_declaration'
@@ -244,6 +246,10 @@ const navItems: NavItem[] = [
   // must still reach its already-imported orders (accounting underlag).
   { href: '/orders', labelKey: 'webshop_orders', icon: ShoppingCart, group: 'arbeta', requiresWebshop: true, betaBadge: true },
   { href: '/supplier-invoices', labelKey: 'supplier_invoices', icon: Wallet, group: 'arbeta' },
+  // Utlägg: out-of-pocket purchases and their reimbursement batches. The
+  // /expenses route previously redirected to supplier invoices; the nav key
+  // has existed in the nav namespace since then.
+  { href: '/expenses', labelKey: 'expenses', icon: Receipt, group: 'arbeta' },
   { href: '/salary', labelKey: 'salary', icon: HandCoins, group: 'arbeta', employerOnly: true },
   // Körjournal: hidden by default (most companies have no car); shows when
   // the settings toggle is on or trips already exist (hybrid gate, same

components/extensions/general/InvoiceInboxWorkspace.tsx

@@ -1,6 +1,7 @@
 'use client'
 
 import { useState, useCallback, useEffect, useRef, useMemo } from 'react'
+import { useRouter } from 'next/navigation'
 import { useCompanySettings } from '@/lib/reference-data/hooks'
 import { useTranslations } from 'next-intl'
 import { Badge } from '@/components/ui/badge'
@@ -430,6 +431,7 @@ const WorkspaceSkeleton = InvoiceInboxSkeleton
 
 export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
   const { toast } = useToast()
+  const router = useRouter()
   const t = useTranslations('inbox_workspace')
   const tStart = useTranslations('start_cards')
   const dismissKeyCompanyId = useCompanyOptional()?.company?.id ?? null
@@ -2153,6 +2155,7 @@ export default function InvoiceInboxWorkspace(_props: WorkspaceComponentProps) {
               onDelete={() => handleDelete(selected.id)}
               onBookDirect={() => setBookDirectOpen(true)}
               onCreateSupplierInvoice={() => setCreateSupplierInvoiceOpen(true)}
+              onRegisterExpense={() => router.push(`/expenses?new=1&inbox_item=${selected.id}`)}
               onMatchTransaction={() => setMatchPickerOpen(true)}
               onUnmatchTransaction={async () => {
                 const targetId = selected.id
@@ -3059,6 +3062,7 @@ function FieldsRail({
   onDelete,
   onBookDirect,
   onCreateSupplierInvoice,
+  onRegisterExpense,
   onMatchTransaction,
   onUnmatchTransaction,
   onAskAssistant,
@@ -3073,6 +3077,7 @@ function FieldsRail({
   onDelete: () => void
   onBookDirect: () => void
   onCreateSupplierInvoice: () => void
+  onRegisterExpense: () => void
   onMatchTransaction: () => void
   onUnmatchTransaction: () => Promise<void>
   onAskAssistant?: (transactionId: string) => void
@@ -3623,6 +3628,15 @@ function FieldsRail({
                     För leverantörsskulder du vill följa (periodisering).
                   </span>
                 </DropdownMenuItem>
+                <DropdownMenuItem
+                  onClick={onRegisterExpense}
+                  className="flex flex-col items-start gap-1"
+                >
+                  <span>Registrera som utlägg</span>
+                  <span className="text-xs text-muted-foreground">
+                    För köp du eller en anställd betalat privat.
+                  </span>
+                </DropdownMenuItem>
                 <DropdownMenuItem
                   onClick={onBookDirect}
                   className="flex flex-col items-start gap-1"