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/emoji-regex/README.md

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+# emoji-regex [![Build status](https://travis-ci.org/mathiasbynens/emoji-regex.svg?branch=master)](https://travis-ci.org/mathiasbynens/emoji-regex)
+
+_emoji-regex_ offers a regular expression to match all emoji symbols (including textual representations of emoji) as per the Unicode Standard.
+
+This repository contains a script that generates this regular expression based on [the data from Unicode v12](https://github.com/mathiasbynens/unicode-12.0.0). Because of this, the regular expression can easily be updated whenever new emoji are added to the Unicode standard.
+
+## Installation
+
+Via [npm](https://www.npmjs.com/):
+
+```bash
+npm install emoji-regex
+```
+
+In [Node.js](https://nodejs.org/):
+
+```js
+const emojiRegex = require('emoji-regex');
+// Note: because the regular expression has the global flag set, this module
+// exports a function that returns the regex rather than exporting the regular
+// expression itself, to make it impossible to (accidentally) mutate the
+// original regular expression.
+
+const text = `
+\u{231A}: ⌚ default emoji presentation character (Emoji_Presentation)
+\u{2194}\u{FE0F}: ↔️ default text presentation character rendered as emoji
+\u{1F469}: 👩 emoji modifier base (Emoji_Modifier_Base)
+\u{1F469}\u{1F3FF}: 👩🏿 emoji modifier base followed by a modifier
+`;
+
+const regex = emojiRegex();
+let match;
+while (match = regex.exec(text)) {
+  const emoji = match[0];
+  console.log(`Matched sequence ${ emoji } — code points: ${ [...emoji].length }`);
+}
+```
+
+Console output:
+
+```
+Matched sequence ⌚ — code points: 1
+Matched sequence ⌚ — code points: 1
+Matched sequence ↔️ — code points: 2
+Matched sequence ↔️ — code points: 2
+Matched sequence 👩 — code points: 1
+Matched sequence 👩 — code points: 1
+Matched sequence 👩🏿 — code points: 2
+Matched sequence 👩🏿 — code points: 2
+```
+
+To match emoji in their textual representation as well (i.e. emoji that are not `Emoji_Presentation` symbols and that aren’t forced to render as emoji by a variation selector), `require` the other regex:
+
+```js
+const emojiRegex = require('emoji-regex/text.js');
+```
+
+Additionally, in environments which support ES2015 Unicode escapes, you may `require` ES2015-style versions of the regexes:
+
+```js
+const emojiRegex = require('emoji-regex/es2015/index.js');
+const emojiRegexText = require('emoji-regex/es2015/text.js');
+```
+
+## Author
+
+| [![twitter/mathias](https://gravatar.com/avatar/24e08a9ea84deb17ae121074d0f17125?s=70)](https://twitter.com/mathias "Follow @mathias on Twitter") |
+|---|
+| [Mathias Bynens](https://mathiasbynens.be/) |
+
+## License
+
+_emoji-regex_ is available under the [MIT](https://mths.be/mit) license.