test: add stage a prototype contracts

frontend/vitest.config.ts

@@ -0,0 +1,15 @@
+import path from 'node:path'
+import { defineConfig } from 'vitest/config'
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      '@': path.resolve(__dirname, './src')
+    }
+  },
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./src/test/setup.ts'],
+    css: true
+  }
+})