chore(examples): use modern JSX transform in examples/projects to fix warning (#10716)

Co-authored-by: Hiroshi Ogawa <4232207+hi-ogawa@users.noreply.github.com>
Co-authored-by: OpenCode (claude-opus-4-8) <noreply@opencode.ai>

Author: hi-ogawa

examples/projects/packages/client/test/basic.test.tsx

@@ -1,6 +1,5 @@
 import { render, screen } from '@testing-library/react'
 import { userEvent } from '@testing-library/user-event'
-import React from 'react'
 import { expect, test } from 'vitest'
 import Link from '../components/Link.js'
 

examples/projects/packages/client/tsconfig.json

@@ -1,7 +1,7 @@
 {
   "compilerOptions": {
     "target": "esnext",
-    "jsx": "react",
+    "jsx": "react-jsx",
     "lib": ["esnext", "dom"],
     "module": "node16",
     "moduleResolution": "node16",

examples/projects/packages/client/vitest.config.ts

@@ -1,6 +1,8 @@
+import react from '@vitejs/plugin-react'
 import { defineConfig } from 'vitest/config'
 
 export default defineConfig({
+  plugins: [react()],
   test: {
     environment: 'jsdom',
     setupFiles: './vitest.setup.ts',