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-native/ReactCommon/react/featureflags/tests/ReactNativeFeatureFlagsTest.cpp

@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include <gtest/gtest.h>
+#include <react/featureflags/ReactNativeFeatureFlags.h>
+#include <react/featureflags/ReactNativeFeatureFlagsDefaults.h>
+#include <stdexcept>
+
+namespace facebook::react {
+
+uint overrideAccessCount = 0;
+
+class ReactNativeFeatureFlagsTestOverrides
+    : public ReactNativeFeatureFlagsDefaults {
+ public:
+  bool commonTestFlag() override {
+    overrideAccessCount++;
+    return true;
+  }
+};
+
+class ReactNativeFeatureFlagsTest : public testing::Test {
+ protected:
+  void SetUp() override {
+    overrideAccessCount = 0;
+  }
+
+  void TearDown() override {
+    ReactNativeFeatureFlags::dangerouslyReset();
+  }
+};
+
+TEST_F(ReactNativeFeatureFlagsTest, providesDefaults) {
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), false);
+}
+
+TEST_F(ReactNativeFeatureFlagsTest, providesOverriddenValues) {
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+}
+
+TEST_F(ReactNativeFeatureFlagsTest, preventsOverridingAfterAccess) {
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), false);
+
+  try {
+    ReactNativeFeatureFlags::override(
+        std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+    FAIL()
+        << "Expected ReactNativeFeatureFlags::override() to throw an exception";
+  } catch (const std::runtime_error& e) {
+    EXPECT_STREQ(
+        "Feature flags were accessed before being overridden: commonTestFlag",
+        e.what());
+  }
+
+  // Overrides shouldn't be applied after they've been accessed
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), false);
+}
+
+TEST_F(ReactNativeFeatureFlagsTest, preventsOverridingAfterOverride) {
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+
+  try {
+    ReactNativeFeatureFlags::override(
+        std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+    FAIL()
+        << "Expected ReactNativeFeatureFlags::override() to throw an exception";
+  } catch (const std::runtime_error& e) {
+    EXPECT_STREQ("Feature flags cannot be overridden more than once", e.what());
+  }
+
+  // Original overrides should still work
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+}
+
+TEST_F(ReactNativeFeatureFlagsTest, cachesValuesFromOverride) {
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(overrideAccessCount, 0);
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+  EXPECT_EQ(overrideAccessCount, 1);
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+  EXPECT_EQ(overrideAccessCount, 1);
+}
+
+TEST_F(
+    ReactNativeFeatureFlagsTest,
+    providesDefaulValuesAgainWhenResettingAfterAnOverride) {
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+
+  ReactNativeFeatureFlags::dangerouslyReset();
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), false);
+}
+
+TEST_F(ReactNativeFeatureFlagsTest, allowsOverridingAgainAfterReset) {
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+
+  ReactNativeFeatureFlags::dangerouslyReset();
+
+  ReactNativeFeatureFlags::override(
+      std::make_unique<ReactNativeFeatureFlagsTestOverrides>());
+
+  EXPECT_EQ(ReactNativeFeatureFlags::commonTestFlag(), true);
+}
+
+} // namespace facebook::react