[MMB-195] Rewrite spaces demo into React

demo-react/.eslintrc.js

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+module.exports = {
+  env: {
+    es6: true,
+    node: true,
+    browser: true,
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    sourceType: 'module',
+  },
+  plugins: ['import'],
+  overrides: [
+    {
+      files: ['**/*.{ts,tsx}'],
+      rules: {
+        'import/extensions': ['off'],
+      },
+    },
+  ],
+};

demo-react/.gitignore

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+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+pnpm-debug.log*
+lerna-debug.log*
+
+node_modules
+dist
+dist-ssr
+*.local
+
+# Editor directories and files
+.vscode/*
+!.vscode/extensions.json
+.idea
+.DS_Store
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

demo-react/README.md

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+# React + TypeScript + Vite
+
+This template provides a minimal setup to get React working in Vite with HMR and some ESLint rules.
+
+Currently, two official plugins are available:
+
+- [@vitejs/plugin-react](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react/README.md) uses [Babel](https://babeljs.io/) for Fast Refresh
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react-swc) uses [SWC](https://swc.rs/) for Fast Refresh
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend updating the configuration to enable type aware lint rules:
+
+- Configure the top-level `parserOptions` property like this:
+
+```js
+   parserOptions: {
+    ecmaVersion: 'latest',
+    sourceType: 'module',
+    project: ['./tsconfig.json', './tsconfig.node.json'],
+    tsconfigRootDir: __dirname,
+   },
+```
+
+- Replace `plugin:@typescript-eslint/recommended` to `plugin:@typescript-eslint/recommended-type-checked` or `plugin:@typescript-eslint/strict-type-checked`
+- Optionally add `plugin:@typescript-eslint/stylistic-type-checked`
+- Install [eslint-plugin-react](https://github.com/jsx-eslint/eslint-plugin-react) and add `plugin:react/recommended` & `plugin:react/jsx-runtime` to the `extends` list

demo-react/api/ably-token-request/index.ts

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+import * as dotenv from 'dotenv';
+import * as Ably from 'ably/promises';
+import { HandlerEvent } from '@netlify/functions';
+
+dotenv.config();
+
+export async function handler(event: HandlerEvent) {
+  if (!process.env.ABLY_API_KEY) {
+    console.error(`
+Missing ABLY_API_KEY environment variable.
+If you're running locally, please ensure you have a ./.env file with a value for ABLY_API_KEY=your-key.
+If you're running in Netlify, make sure you've configured env variable ABLY_API_KEY.
+
+Please see README.md for more details on configuring your Ably API Key.`);
+
+    return {
+      statusCode: 500,
+      headers: { 'content-type': 'application/json' },
+      body: JSON.stringify('ABLY_API_KEY is not set'),
+    };
+  }
+
+  const clientId = event.queryStringParameters?.['clientId'] || process.env.DEFAULT_CLIENT_ID || 'NO_CLIENT_ID';
+  const client = new Ably.Rest(process.env.ABLY_API_KEY);
+  const tokenRequestData = await client.auth.createTokenRequest({ clientId: clientId });
+
+  return {
+    statusCode: 200,
+    headers: { 'content-type': 'application/json' },
+    body: JSON.stringify(tokenRequestData),
+  };
+}