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/metro/src/DeltaBundler/mergeDeltas.js

@@ -0,0 +1,53 @@
+"use strict";
+
+function mergeDeltas(delta1, delta2) {
+  const added1 = new Map(delta1.added);
+  const modified1 = new Map(delta1.modified);
+  const deleted1 = new Set(delta1.deleted);
+  const added2 = new Map(delta2.added);
+  const modified2 = new Map(delta2.modified);
+  const deleted2 = new Set(delta2.deleted);
+  const added = new Map();
+  const modified = new Map();
+  const deleted = new Set();
+  for (const [id, code] of added1) {
+    if (!deleted2.has(id) && !modified2.has(id)) {
+      added.set(id, code);
+    }
+  }
+  for (const [id, code] of modified1) {
+    if (!deleted2.has(id) && !modified2.has(id)) {
+      modified.set(id, code);
+    }
+  }
+  for (const id of deleted1) {
+    if (!added2.has(id)) {
+      deleted.add(id);
+    }
+  }
+  for (const [id, code] of added2) {
+    if (deleted1.has(id)) {
+      modified.set(id, code);
+    } else {
+      added.set(id, code);
+    }
+  }
+  for (const [id, code] of modified2) {
+    if (added1.has(id)) {
+      added.set(id, code);
+    } else {
+      modified.set(id, code);
+    }
+  }
+  for (const id of deleted2) {
+    if (!added1.has(id)) {
+      deleted.add(id);
+    }
+  }
+  return {
+    added: [...added.entries()],
+    modified: [...modified.entries()],
+    deleted: [...deleted],
+  };
+}
+module.exports = mergeDeltas;