fix(theme): 修复 footer 在首页的错误渲染

theme/src/client/components/Home/VPHome.vue

@@ -60,7 +60,7 @@ let el: HTMLDivElement | null = null
 
 watch(() => onlyOnce.value, value => nextTick(() => {
   if (typeof document !== 'undefined') {
-    el ??= document.querySelector('#VPContent')
+    el ??= document.querySelector('.vp-layout')
     el?.classList.toggle('footer-no-border', value)
   }
 }), { immediate: true })

theme/src/client/components/VPFooter.vue

@@ -50,6 +50,7 @@ onMounted(() => {
 }
 
 .footer-no-border .vp-footer {
+  background-color: transparent;
   border-top: none;
 }