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/graphql/error/locatedError.js

@@ -0,0 +1,30 @@
+"use strict";
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.locatedError = locatedError;
+
+var _inspect = _interopRequireDefault(require("../jsutils/inspect.js"));
+
+var _GraphQLError = require("./GraphQLError.js");
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Given an arbitrary value, presumably thrown while attempting to execute a
+ * GraphQL operation, produce a new GraphQLError aware of the location in the
+ * document responsible for the original Error.
+ */
+function locatedError(rawOriginalError, nodes, path) {
+  var _nodes;
+
+  // Sometimes a non-error is thrown, wrap it as an Error instance to ensure a consistent Error interface.
+  var originalError = rawOriginalError instanceof Error ? rawOriginalError : new Error('Unexpected error value: ' + (0, _inspect.default)(rawOriginalError)); // Note: this uses a brand-check to support GraphQL errors originating from other contexts.
+
+  if (Array.isArray(originalError.path)) {
+    return originalError;
+  }
+
+  return new _GraphQLError.GraphQLError(originalError.message, (_nodes = originalError.nodes) !== null && _nodes !== void 0 ? _nodes : nodes, originalError.source, originalError.positions, path, originalError);
+}