chore(scaffold): installer deps runtime/dev + configurer Vitest

vite.config.ts

@@ -1,5 +1,5 @@
 import { fileURLToPath, URL } from 'node:url'
-import { defineConfig } from 'vite'
+import { defineConfig } from 'vitest/config'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
 
@@ -11,4 +11,9 @@ export default defineConfig({
       '@': fileURLToPath(new URL('./src', import.meta.url)),
     },
   },
+  test: {
+    environment: 'jsdom',
+    setupFiles: ['./src/test-setup.ts'],
+    globals: false,
+  },
 })