refactor(web): migrate to Vitest and esm (#29974)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: yyh <yuanyouhuilyz@gmail.com>

web/vitest.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+import tsconfigPaths from 'vite-tsconfig-paths'
+
+export default defineConfig({
+  plugins: [tsconfigPaths(), react() as any],
+  test: {
+    environment: 'jsdom',
+    globals: true,
+    setupFiles: ['./vitest.setup.ts'],
+    coverage: {
+      provider: 'v8',
+      reporter: ['text', 'json', 'json-summary'],
+    },
+  },
+})