Initial kitchen scaffold — Phase 1 kitchen port (build-verified 2026-07-11)

FastAPI backend (Python 3.11, MSSQL ODBC for SambaPOS, Azure DI OCR),
kitchen_db on central PG. React/TS/Vite frontend with navy sidebar layout.

Backend: auth.py (APP_SLUG=kitchen, SimpleNamespace — archive routes use
.kitchen_id/.is_admin without modification), main.py (51 migrations, scheduler,
internal router for KDS bookings feed), api/internal.py, full archive API
(31 routers: invoices, recipes, menus, sambapos, resos, newbook, disputes,
purchase_orders, etc.), models, migrations, OCR pipeline.
kitchen_id pinned to 1 (B1 — single hotel).

Frontend: AuthGate (app=kitchen, token shim for archive compat — B5b pending),
Layout (navy sidebar, 6 sections, Lucide icons, teal --app-primary),
App.tsx (Outlet pattern, UploadApp outside Layout), index.css (full :root block).
strict: false — archive components have type issues; build clean.

Note: 45 archive components call fetch('/api/...') without /kitchen/ prefix
(B5b). Runtime 404s; deferred until after initial testing.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/node_modules/@tanstack/react-query/src/useMutationState.ts

@@ -0,0 +1,75 @@
+'use client'
+import * as React from 'react'
+
+import { notifyManager, replaceEqualDeep } from '@tanstack/query-core'
+import { useQueryClient } from './QueryClientProvider'
+import type {
+  Mutation,
+  MutationCache,
+  MutationFilters,
+  MutationState,
+  QueryClient,
+} from '@tanstack/query-core'
+
+export function useIsMutating(
+  filters?: MutationFilters,
+  queryClient?: QueryClient,
+): number {
+  const client = useQueryClient(queryClient)
+  return useMutationState(
+    { filters: { ...filters, status: 'pending' } },
+    client,
+  ).length
+}
+
+type MutationStateOptions<TResult = MutationState> = {
+  filters?: MutationFilters
+  select?: (mutation: Mutation) => TResult
+}
+
+function getResult<TResult = MutationState>(
+  mutationCache: MutationCache,
+  options: MutationStateOptions<TResult>,
+): Array<TResult> {
+  return mutationCache
+    .findAll(options.filters)
+    .map(
+      (mutation): TResult =>
+        (options.select ? options.select(mutation) : mutation.state) as TResult,
+    )
+}
+
+export function useMutationState<TResult = MutationState>(
+  options: MutationStateOptions<TResult> = {},
+  queryClient?: QueryClient,
+): Array<TResult> {
+  const mutationCache = useQueryClient(queryClient).getMutationCache()
+  const optionsRef = React.useRef(options)
+  const result = React.useRef<Array<TResult>>(null)
+  if (result.current === null) {
+    result.current = getResult(mutationCache, options)
+  }
+
+  React.useEffect(() => {
+    optionsRef.current = options
+  })
+
+  return React.useSyncExternalStore(
+    React.useCallback(
+      (onStoreChange) =>
+        mutationCache.subscribe(() => {
+          const nextResult = replaceEqualDeep(
+            result.current,
+            getResult(mutationCache, optionsRef.current),
+          )
+          if (result.current !== nextResult) {
+            result.current = nextResult
+            notifyManager.schedule(onStoreChange)
+          }
+        }),
+      [mutationCache],
+    ),
+    () => result.current,
+    () => result.current,
+  )!
+}