ci: add test configuration files for Playwright and Vitest

vitest.config.mts

@@ -0,0 +1,18 @@
+import { defineConfig } from 'vitest/config'
+import react from '@vitejs/plugin-react'
+import path from 'path'
+
+export default defineConfig({
+  plugins: [react()],
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./vitest.setup.ts'],
+    globals: true,
+    exclude: ['**/e2e/**', '**/node_modules/**'],
+  },
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src'),
+    },
+  },
+})