feat: create writing-platform frontend with React + Vite + TypeScript

- Scaffold React 19 + Vite 8 + TypeScript project
- Install and configure Tailwind CSS 3.4 with custom design system
- Install react-router-dom, zustand, socket.io-client, lucide-react
- Configure vite.config.ts with base: '/writing/' for deployment
- Set up Tailwind with brand/ink color palette, font families, shadows
- Clean up Vite template boilerplate, add minimal App component

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

writing-platform/frontend/.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?

writing-platform/frontend/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) uses [Oxc](https://oxc.rs)
+- [@vitejs/plugin-react-swc](https://github.com/vitejs/vite-plugin-react/blob/main/packages/plugin-react-swc) uses [SWC](https://swc.rs/)
+
+## React Compiler
+
+The React Compiler is not enabled on this template because of its impact on dev & build performances. To add it, see [this documentation](https://react.dev/learn/react-compiler/installation).
+
+## Expanding the ESLint configuration
+
+If you are developing a production application, we recommend updating the configuration to enable type-aware lint rules:
+
+```js
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+
+      // Remove tseslint.configs.recommended and replace with this
+      tseslint.configs.recommendedTypeChecked,
+      // Alternatively, use this for stricter rules
+      tseslint.configs.strictTypeChecked,
+      // Optionally, add this for stylistic rules
+      tseslint.configs.stylisticTypeChecked,
+
+      // Other configs...
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+```
+
+You can also install [eslint-plugin-react-x](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-x) and [eslint-plugin-react-dom](https://github.com/Rel1cx/eslint-react/tree/main/packages/plugins/eslint-plugin-react-dom) for React-specific lint rules:
+
+```js
+// eslint.config.js
+import reactX from 'eslint-plugin-react-x'
+import reactDom from 'eslint-plugin-react-dom'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      // Other configs...
+      // Enable lint rules for React
+      reactX.configs['recommended-typescript'],
+      // Enable lint rules for React DOM
+      reactDom.configs.recommended,
+    ],
+    languageOptions: {
+      parserOptions: {
+        project: ['./tsconfig.node.json', './tsconfig.app.json'],
+        tsconfigRootDir: import.meta.dirname,
+      },
+      // other options...
+    },
+  },
+])
+```

writing-platform/frontend/eslint.config.js

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+import js from '@eslint/js'
+import globals from 'globals'
+import reactHooks from 'eslint-plugin-react-hooks'
+import reactRefresh from 'eslint-plugin-react-refresh'
+import tseslint from 'typescript-eslint'
+import { defineConfig, globalIgnores } from 'eslint/config'
+
+export default defineConfig([
+  globalIgnores(['dist']),
+  {
+    files: ['**/*.{ts,tsx}'],
+    extends: [
+      js.configs.recommended,
+      tseslint.configs.recommended,
+      reactHooks.configs.flat.recommended,
+      reactRefresh.configs.vite,
+    ],
+    languageOptions: {
+      ecmaVersion: 2020,
+      globals: globals.browser,
+    },
+  },
+])

writing-platform/frontend/index.html

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+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/favicon.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>frontend</title>
+  </head>
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>

writing-platform/frontend/package.json

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+{
+  "name": "frontend",
+  "private": true,
+  "version": "0.0.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc -b && vite build",
+    "lint": "eslint .",
+    "preview": "vite preview"
+  },
+  "dependencies": {
+    "lucide-react": "^1.6.0",
+    "react": "^19.2.4",
+    "react-dom": "^19.2.4",
+    "react-router-dom": "^7.13.2",
+    "socket.io-client": "^4.8.3",
+    "zustand": "^5.0.12"
+  },
+  "devDependencies": {
+    "@eslint/js": "^9.39.4",
+    "@types/node": "^24.12.0",
+    "@types/react": "^19.2.14",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^6.0.1",
+    "autoprefixer": "^10.4.27",
+    "eslint": "^9.39.4",
+    "eslint-plugin-react-hooks": "^7.0.1",
+    "eslint-plugin-react-refresh": "^0.5.2",
+    "globals": "^17.4.0",
+    "postcss": "^8.5.8",
+    "tailwindcss": "^3.4.19",
+    "typescript": "~5.9.3",
+    "typescript-eslint": "^8.57.0",
+    "vite": "^8.0.1"
+  }
+}

writing-platform/frontend/postcss.config.js

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+export default {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+}

writing-platform/frontend/src/App.tsx

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+import { PenLine } from 'lucide-react'
+
+function App() {
+  return (
+    <div className="flex min-h-screen items-center justify-center bg-gradient-to-br from-brand-50 to-white">
+      <div className="text-center">
+        <div className="mb-6 flex justify-center">
+          <div className="rounded-2xl bg-brand-500 p-4 shadow-glow">
+            <PenLine className="h-10 w-10 text-white" />
+          </div>
+        </div>
+        <h1 className="text-4xl font-bold tracking-tight text-ink-900">
+          Writing Platform
+        </h1>
+        <p className="mt-3 text-lg text-ink-600">
+          Ready to build something great.
+        </p>
+      </div>
+    </div>
+  )
+}
+
+export default App

writing-platform/frontend/src/index.css

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+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+body {
+  @apply m-0 bg-white text-ink-800 antialiased;
+}
+
+#root {
+  @apply min-h-screen;
+}

writing-platform/frontend/src/main.tsx

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+import { StrictMode } from 'react'
+import { createRoot } from 'react-dom/client'
+import './index.css'
+import App from './App.tsx'
+
+createRoot(document.getElementById('root')!).render(
+  <StrictMode>
+    <App />
+  </StrictMode>,
+)

writing-platform/frontend/tailwind.config.js

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+/** @type {import('tailwindcss').Config} */
+export default {
+  content: [
+    './index.html',
+    './src/**/*.{ts,tsx}',
+  ],
+  theme: {
+    extend: {
+      colors: {
+        brand: {
+          50: '#f0f4ff',
+          100: '#dbe4ff',
+          200: '#bac8ff',
+          300: '#91a7ff',
+          400: '#748ffc',
+          500: '#5c7cfa',
+          600: '#4c6ef5',
+          700: '#4263eb',
+          800: '#3b5bdb',
+          900: '#364fc7',
+        },
+        ink: {
+          50: '#f8f9fa',
+          100: '#f1f3f5',
+          200: '#e9ecef',
+          300: '#dee2e6',
+          400: '#ced4da',
+          500: '#adb5bd',
+          600: '#868e96',
+          700: '#495057',
+          800: '#343a40',
+          900: '#212529',
+        },
+      },
+      fontFamily: {
+        sans: ['Inter', 'system-ui', '-apple-system', 'sans-serif'],
+        serif: ['Merriweather', 'Georgia', 'serif'],
+        mono: ['JetBrains Mono', 'Fira Code', 'monospace'],
+      },
+      spacing: {
+        18: '4.5rem',
+        88: '22rem',
+        128: '32rem',
+      },
+      borderRadius: {
+        '4xl': '2rem',
+      },
+      boxShadow: {
+        soft: '0 2px 15px -3px rgba(0, 0, 0, 0.07), 0 10px 20px -2px rgba(0, 0, 0, 0.04)',
+        glow: '0 0 15px rgba(92, 124, 250, 0.3)',
+      },
+    },
+  },
+  plugins: [],
+}
+

writing-platform/frontend/tsconfig.app.json

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+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.app.tsbuildinfo",
+    "target": "ES2023",
+    "useDefineForClassFields": true,
+    "lib": ["ES2023", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "types": ["vite/client"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["src"]
+}

writing-platform/frontend/tsconfig.json

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+{
+  "files": [],
+  "references": [
+    { "path": "./tsconfig.app.json" },
+    { "path": "./tsconfig.node.json" }
+  ]
+}

writing-platform/frontend/tsconfig.node.json

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+{
+  "compilerOptions": {
+    "tsBuildInfoFile": "./node_modules/.tmp/tsconfig.node.tsbuildinfo",
+    "target": "ES2023",
+    "lib": ["ES2023"],
+    "module": "ESNext",
+    "types": ["node"],
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "verbatimModuleSyntax": true,
+    "moduleDetection": "force",
+    "noEmit": true,
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "erasableSyntaxOnly": true,
+    "noFallthroughCasesInSwitch": true,
+    "noUncheckedSideEffectImports": true
+  },
+  "include": ["vite.config.ts"]
+}

writing-platform/frontend/vite.config.ts

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+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  base: '/writing/',
+})