fix: update Vue template syntax and improve Vite config

- Fix Vue template syntax in App.vue by using proper event handler format
- Update Vite config to properly handle ESM imports and crypto modules
- Add manual chunks for better code splitting
- Improve environment variable handling in vite-env.d.ts
- Fix TypeScript linting errors in App.vue

postcss.config.cjs

@@ -0,0 +1,6 @@
+module.exports = {
+  plugins: {
+    tailwindcss: {},
+    autoprefixer: {},
+  },
+};