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/runtime/iostests/RCTHostTests.mm

@@ -0,0 +1,159 @@
+/*
+ * 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 <XCTest/XCTest.h>
+
+#import <RCTTestUtils/RCTMemoryUtils.h>
+#import <RCTTestUtils/ShimRCTInstance.h>
+#import <React/RCTLog.h>
+#import <React/RCTMockDef.h>
+#import <ReactCommon/RCTHermesInstance.h>
+#import <ReactCommon/RCTHost.h>
+#import <ReactCommon/RCTInstance.h>
+#import <ReactCommon/RCTTurboModuleManager.h>
+
+#import <OCMock/OCMock.h>
+
+RCT_MOCK_REF(RCTHost, _RCTLogNativeInternal);
+
+RCTLogLevel gLogLevel;
+int gLogCalledTimes = 0;
+NSString *gLogMessage = nil;
+static void RCTLogNativeInternalMock(RCTLogLevel level, const char *fileName, int lineNumber, NSString *format, ...)
+{
+  gLogLevel = level;
+  gLogCalledTimes++;
+
+  va_list args;
+  va_start(args, format);
+  gLogMessage = [[NSString alloc] initWithFormat:format arguments:args];
+  va_end(args);
+}
+
+@interface RCTHostTests : XCTestCase
+@end
+
+@implementation RCTHostTests {
+  RCTHost *_subject;
+  id<RCTHostDelegate> _mockHostDelegate;
+}
+
+static ShimRCTInstance *shimmedRCTInstance;
+
+- (void)setUp
+{
+  [super setUp];
+
+  RCTAutoReleasePoolPush();
+
+  shimmedRCTInstance = [ShimRCTInstance new];
+
+  _mockHostDelegate = OCMProtocolMock(@protocol(RCTHostDelegate));
+  _subject = [[RCTHost alloc] initWithBundleURL:OCMClassMock([NSURL class])
+                                   hostDelegate:_mockHostDelegate
+                     turboModuleManagerDelegate:OCMProtocolMock(@protocol(RCTTurboModuleManagerDelegate))
+                               jsEngineProvider:^std::shared_ptr<facebook::react::JSRuntimeFactory>() {
+                                 return std::make_shared<facebook::react::RCTHermesInstance>();
+                               }
+                                  launchOptions:nil];
+}
+
+- (void)tearDown
+{
+  RCTAutoReleasePoolPop();
+
+  _subject = nil;
+  XCTAssertEqual(RCTGetRetainCount(_subject), 0);
+
+  _mockHostDelegate = nil;
+  XCTAssertEqual(RCTGetRetainCount(_mockHostDelegate), 0);
+
+  [shimmedRCTInstance reset];
+  gLogCalledTimes = 0;
+  gLogMessage = nil;
+
+  [super tearDown];
+}
+
+- (void)testStart
+{
+  RCT_MOCK_SET(RCTHost, _RCTLogNativeInternal, RCTLogNativeInternalMock);
+
+  XCTAssertEqual(shimmedRCTInstance.initCount, 0);
+  [_subject start];
+  OCMVerify(OCMTimes(1), [_mockHostDelegate hostDidStart:_subject]);
+  XCTAssertEqual(shimmedRCTInstance.initCount, 1);
+  XCTAssertEqual(gLogCalledTimes, 0);
+
+  XCTAssertEqual(shimmedRCTInstance.invalidateCount, 0);
+  [_subject start];
+  XCTAssertEqual(shimmedRCTInstance.initCount, 2);
+  XCTAssertEqual(shimmedRCTInstance.invalidateCount, 1);
+  OCMVerify(OCMTimes(2), [_mockHostDelegate hostDidStart:_subject]);
+  XCTAssertEqual(gLogLevel, RCTLogLevelWarning);
+  XCTAssertEqual(gLogCalledTimes, 1);
+  XCTAssertEqualObjects(
+      gLogMessage,
+      @"RCTHost should not be creating a new instance if one already exists. This implies there is a bug with how/when this method is being called.");
+
+  RCT_MOCK_RESET(RCTHost, _RCTLogNativeInternal);
+}
+
+- (void)testCallFunctionOnJSModule
+{
+  [_subject start];
+
+  NSArray *args = @[ @"hi", @(5), @(NO) ];
+  [_subject callFunctionOnJSModule:@"jsModule" method:@"method" args:args];
+
+  XCTAssertEqualObjects(shimmedRCTInstance.jsModuleName, @"jsModule");
+  XCTAssertEqualObjects(shimmedRCTInstance.method, @"method");
+  XCTAssertEqualObjects(shimmedRCTInstance.args, args);
+}
+
+- (void)testDidReceiveErrorStack
+{
+  id<RCTInstanceDelegate> instanceDelegate = (id<RCTInstanceDelegate>)_subject;
+
+  NSMutableArray<NSDictionary<NSString *, id> *> *stack = [NSMutableArray array];
+
+  NSMutableDictionary<NSString *, id> *stackFrame0 = [NSMutableDictionary dictionary];
+  stackFrame0[@"linenumber"] = @(3);
+  stackFrame0[@"column"] = @(4);
+  stackFrame0[@"methodname"] = @"method1";
+  stackFrame0[@"file"] = @"file1.js";
+  [stack addObject:stackFrame0];
+
+  NSMutableDictionary<NSString *, id> *stackFrame1 = [NSMutableDictionary dictionary];
+  stackFrame0[@"linenumber"] = @(63);
+  stackFrame0[@"column"] = @(44);
+  stackFrame0[@"methodname"] = @"method2";
+  stackFrame0[@"file"] = @"file2.js";
+  [stack addObject:stackFrame1];
+
+  [instanceDelegate instance:[OCMArg any] didReceiveJSErrorStack:stack message:@"message" exceptionId:5 isFatal:YES];
+
+  OCMVerify(
+      OCMTimes(1),
+      [_mockHostDelegate host:_subject didReceiveJSErrorStack:stack message:@"message" exceptionId:5 isFatal:YES]);
+}
+
+- (void)testDidInitializeRuntime
+{
+  id<RCTHostRuntimeDelegate> mockRuntimeDelegate = OCMProtocolMock(@protocol(RCTHostRuntimeDelegate));
+  _subject.runtimeDelegate = mockRuntimeDelegate;
+
+  auto hermesRuntime = facebook::hermes::makeHermesRuntime();
+  facebook::jsi::Runtime *rt = hermesRuntime.get();
+
+  id<RCTInstanceDelegate> instanceDelegate = (id<RCTInstanceDelegate>)_subject;
+  [instanceDelegate instance:[OCMArg any] didInitializeRuntime:*rt];
+
+  OCMVerify(OCMTimes(1), [mockRuntimeDelegate host:_subject didInitializeRuntime:*rt]);
+}
+
+@end