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/@react-navigation/native/lib/module/useDocumentTitle.js

@@ -0,0 +1,25 @@
+import * as React from 'react';
+/**
+ * Set the document title for the active screen
+ */
+export default function useDocumentTitle(ref) {
+  let {
+    enabled = true,
+    formatter = (options, route) => (options === null || options === void 0 ? void 0 : options.title) ?? (route === null || route === void 0 ? void 0 : route.name)
+  } = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+  React.useEffect(() => {
+    if (!enabled) {
+      return;
+    }
+    const navigation = ref.current;
+    if (navigation) {
+      const title = formatter(navigation.getCurrentOptions(), navigation.getCurrentRoute());
+      document.title = title;
+    }
+    return navigation === null || navigation === void 0 ? void 0 : navigation.addListener('options', e => {
+      const title = formatter(e.data.options, navigation === null || navigation === void 0 ? void 0 : navigation.getCurrentRoute());
+      document.title = title;
+    });
+  });
+}
+//# sourceMappingURL=useDocumentTitle.js.map