fix: correct @ alias path for ESM context

vite.config.ts

@@ -1,11 +1,15 @@
 import { defineConfig } from 'vite'
 import react from '@vitejs/plugin-react'
 import tailwindcss from '@tailwindcss/vite'
+import { resolve } from 'path'
+import { fileURLToPath } from 'url'
+
+const __dirname = fileURLToPath(new URL('.', import.meta.url))
 
 export default defineConfig({
   plugins: [react(), tailwindcss()],
   resolve: {
-    alias: { '@': '/src' }
+    alias: { '@': resolve(__dirname, 'src') }
   },
   server: {
     proxy: {