Fix: 调整代码结构

src/layouts/CalculatorLayout.vue

@@ -160,10 +160,8 @@
   import { useI18n } from 'vue-i18n'
   import { navigationConfig } from '@/config/navigation'
   import { useNavigationStore } from '@/stores/navigation'
-  import { useRoute } from 'vue-router'
 
   const { t, locale } = useI18n()
-  const route = useRoute()
 
   const navigationStore = useNavigationStore()
 
@@ -270,7 +268,7 @@
     locale.value = locale.value === 'zh' ? 'en' : 'zh'
   }
 
-  function handleSelect (index: number) {
+  function handleSelect (_index: number) {
     drawer.value = false // 选择后自动关闭抽屉
   }