feat(web): init Vite + React + Tailwind client scaffold

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

web/client/src/index.css

@@ -0,0 +1,12 @@
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+
+@layer base {
+  * {
+    @apply border-border;
+  }
+  body {
+    @apply bg-zinc-950 text-zinc-50;
+  }
+}

web/client/src/lib/utils.ts

@@ -0,0 +1,6 @@
+import { clsx, type ClassValue } from 'clsx';
+import { twMerge } from 'tailwind-merge';
+
+export function cn(...inputs: ClassValue[]) {
+  return twMerge(clsx(inputs));
+}

web/client/src/main.tsx

@@ -0,0 +1,10 @@
+import React from 'react';
+import ReactDOM from 'react-dom/client';
+import App from './App';
+import './index.css';
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>
+);