feat: 优化响应式设计中的内边距逻辑

src/components/layout/Main.vue

 <script setup lang="ts">
+const isMobile = useMediaQuery('(max-width: 767px)')
+
 const isIframe = computed(() => {
   return window.self !== window.top
 })
 
 const padding = computed(() => {
-  if (isIframe.value) return '0 10px'
-  if (typeof window !== 'undefined' && window.innerWidth < 768) return '6px'
+  if (isIframe.value) return isMobile.value ? '0' : '0 0 0 10px'
   return '10px'
 })
 </script>