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/Libraries/Wrapper/Example/RCTWrapperExampleView.m

@@ -0,0 +1,53 @@
+/*
+ * 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.
+ */
+
+#import "RCTWrapperExampleView.h"
+
+#import <RCTWrapper/RCTWrapper.h>
+
+@implementation RCTWrapperExampleView {
+  NSTimer *_timer;
+  CGSize _intrinsicContentSize;
+}
+
+- (instancetype)initWithFrame:(CGRect)frame
+{
+  if (self = [super initWithFrame:frame]) {
+    self.backgroundColor = [UIColor whiteColor];
+
+    _intrinsicContentSize = CGSizeMake(64, 64);
+    _timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(tick) userInfo:nil repeats:YES];
+
+    UITapGestureRecognizer *gestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self
+                                                                                        action:@selector(tick)];
+    [self addGestureRecognizer:gestureRecognizer];
+  }
+  return self;
+}
+
+- (void)tick
+{
+  _intrinsicContentSize.width = 32 + arc4random() % 128;
+  _intrinsicContentSize.height = 32 + arc4random() % 128;
+
+  [self invalidateIntrinsicContentSize];
+  [self.superview setNeedsLayout];
+}
+
+- (CGSize)intrinsicContentSize
+{
+  return _intrinsicContentSize;
+}
+
+- (CGSize)sizeThatFits:(CGSize)size
+{
+  return CGSizeMake(MIN(size.width, _intrinsicContentSize.width), MIN(size.height, _intrinsicContentSize.height));
+}
+
+@end
+
+RCT_WRAPPER_FOR_VIEW(RCTWrapperExampleView)