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/expo-file-system/ios/FileSystemExceptions.swift

@@ -0,0 +1,99 @@
+// Copyright 2023-present 650 Industries. All rights reserved.
+
+import ExpoModulesCore
+
+final class FileNotExistsException: GenericException<String> {
+  override var reason: String {
+    "File '\(param)' does not exist"
+  }
+}
+
+final class FileAlreadyExistsException: GenericException<String> {
+  override var reason: String {
+    "File '\(param)' already exists"
+  }
+}
+
+final class DirectoryNotExistsException: GenericException<String> {
+  override var reason: String {
+    "Directory '\(param)' does not exist"
+  }
+}
+
+final class FileNotReadableException: GenericException<String> {
+  override var reason: String {
+    "File '\(param)' is not readable"
+  }
+}
+
+final class FileNotWritableException: GenericException<String> {
+  override var reason: String {
+    "File '\(param)' is not writable"
+  }
+}
+
+final class FileWriteFailedException: GenericException<String> {
+  override var reason: String {
+    "Writing to '\(param)' file has failed"
+  }
+}
+
+final class FileCannotDeleteException: GenericException<String> {
+  override var reason: String {
+    "File '\(param)' could not be deleted"
+  }
+}
+
+final class InvalidFileUrlException: GenericException<URL> {
+  override var reason: String {
+    "'\(param.absoluteString)' is not a file URL"
+  }
+}
+
+final class UnsupportedSchemeException: GenericException<String?> {
+  override var reason: String {
+    "Unsupported URI scheme: '\(String(describing: param))'"
+  }
+}
+
+final class HeaderEncodingFailedException: GenericException<String> {
+  override var reason: String {
+    "Unable to encode headers for request '\(param)' to UTF8"
+  }
+}
+
+final class DownloadTaskNotFoundException: GenericException<String> {
+  override var reason: String {
+    "Cannot find a download task with id: '\(param)'"
+  }
+}
+
+final class CannotDetermineDiskCapacity: Exception {
+  override var reason: String {
+    "Unable to determine free disk storage capacity"
+  }
+}
+
+final class FailedToCreateBodyException: Exception {
+  override var reason: String {
+    "Unable to create multipart body"
+  }
+}
+
+final class FailedToAccessDirectoryException: Exception {
+  override var reason: String {
+    "Failed to access `Caches` directory"
+  }
+}
+
+final class FailedToCopyAssetException: GenericException<String> {
+  override var reason: String {
+    "Failed to copy photo library asset: \(param)"
+  }
+}
+
+final class FailedToFindAssetException: GenericException<String> {
+  override var reason: String {
+    "Failed to find photo library asset: \(param)"
+  }
+}