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/array-buffer-byte-length/README.md

@@ -0,0 +1,40 @@
+# array-buffer-byte-length <sup>[![Version Badge][npm-version-svg]][package-url]</sup>
+
+[![github actions][actions-image]][actions-url]
+[![coverage][codecov-image]][codecov-url]
+[![License][license-image]][license-url]
+[![Downloads][downloads-image]][downloads-url]
+
+[![npm badge][npm-badge-png]][package-url]
+
+Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.
+
+## Example
+
+```js
+const assert = require('assert');
+const byteLength = require('array-buffer-byte-length');
+
+assert.equal(byteLength([]), NaN, 'an array is not an ArrayBuffer, yields NaN');
+
+assert.equal(byteLength(new ArrayBuffer(0)), 0, 'ArrayBuffer of byteLength 0, yields 0');
+```
+
+## Tests
+Simply clone the repo, `npm install`, and run `npm test`
+
+[package-url]: https://npmjs.org/package/array-buffer-byte-length
+[npm-version-svg]: https://versionbadg.es/inspect-js/array-buffer-byte-length.svg
+[deps-svg]: https://david-dm.org/inspect-js/array-buffer-byte-length.svg
+[deps-url]: https://david-dm.org/inspect-js/array-buffer-byte-length
+[dev-deps-svg]: https://david-dm.org/inspect-js/array-buffer-byte-length/dev-status.svg
+[dev-deps-url]: https://david-dm.org/inspect-js/array-buffer-byte-length#info=devDependencies
+[npm-badge-png]: https://nodei.co/npm/array-buffer-byte-length.png?downloads=true&stars=true
+[license-image]: https://img.shields.io/npm/l/array-buffer-byte-length.svg
+[license-url]: LICENSE
+[downloads-image]: https://img.shields.io/npm/dm/array-buffer-byte-length.svg
+[downloads-url]: https://npm-stat.com/charts.html?package=array-buffer-byte-length
+[codecov-image]: https://codecov.io/gh/inspect-js/array-buffer-byte-length/branch/main/graphs/badge.svg
+[codecov-url]: https://app.codecov.io/gh/inspect-js/array-buffer-byte-length/
+[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/inspect-js/array-buffer-byte-length
+[actions-url]: https://github.com/inspect-js/array-buffer-byte-length/actions