feat(smart-app): implement complete mobile app MVP

- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image

smart-app-city/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,
+  )!
+}