scaffold: Vite + React + TypeScript + Vitest project setup

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vite.config.ts

@@ -0,0 +1,17 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+
+export default defineConfig({
+  plugins: [react()],
+  css: {
+    modules: {
+      localsConvention: 'camelCase',
+    },
+  },
+  test: {
+    globals: true,
+    environment: 'happy-dom',
+    setupFiles: ['./src/test-setup.ts'],
+    css: { modules: { classNameStrategy: 'non-scoped' } },
+  },
+})