优化 VCard 组件的样式，移除多余的圆角设置，提升界面一致性

src/components/filebrowser/FileList.vue

@@ -533,7 +533,7 @@ onMounted(() => {
 </script>
 
 <template>
-  <VCard class="d-flex flex-column w-full h-full rounded-t-0 rounded-s-0">
+  <VCard class="d-flex flex-column w-full h-full">
     <VToolbar v-if="!loading" density="compact" flat color="gray">
       <VTextField
         v-if="!isFile"

src/components/filebrowser/FileNavigator.vue

@@ -259,7 +259,7 @@ function getIndentLevel(path: string, ancestorPath: string) {
 </script>
 
 <template>
-  <VCard class="file-navigator rounded-t-0 rounded-e-0" v-if="!isMobile">
+  <VCard class="file-navigator" v-if="!isMobile">
     <div class="tree-container">
       <!-- 根目录项 -->
       <div

src/components/filebrowser/FileToolbar.vue

@@ -115,7 +115,7 @@ const sortIcon = computed(() => {
 </script>
 
 <template>
-  <VToolbar flat dense class="rounded-t-lg border-b">
+  <VToolbar flat dense class="rounded-t-lg border-b overflow-hidden">
     <VToolbarItems class="overflow-hidden">
       <VMenu v-if="inProps.storages?.length || 0 > 1" offset-y>
         <template #activator="{ props }">