fix:#3 added process timezone for tests

frontend/vitest.config.ts

@@ -0,0 +1,11 @@
+// vitest.config.ts
+import {mergeConfig} from 'vite'
+import {defineConfig} from 'vitest/config'
+import viteConfig from './vite.config'
+
+export default mergeConfig(viteConfig, defineConfig({
+  test: {
+    globals: true,
+    globalSetup: './vitest.global-setup.ts',
+  },
+}))