优化登录页UI、新增占满布局类

frontend/src/components/FaqCategoryPanel.vue

@@ -1,5 +1,5 @@
 <template>
-  <el-card class="panel">
+  <div class="panel unified-shell">
     <div class="header">
       <span>{{ TEXT.common.labels.category }}</span>
       <div v-if="canMaintain">
@@ -23,7 +23,7 @@
       </el-menu-item>
     </el-menu>
     <FaqCategoryForm v-model="showForm" :category="editing" :is-admin="isAdmin" @success="emit('refresh')" />
-  </el-card>
+  </div>
 </template>
 
 <script setup lang="ts">
@@ -94,18 +94,24 @@ const onDelete = async (cat: FaqCategory) => {
 
 <style scoped>
 .panel {
-  padding: 0;
+  border: 0;
+  border-radius: 0;
+  box-shadow: none;
+  overflow: hidden;
 }
+
 .header {
   display: flex;
   justify-content: space-between;
   align-items: center;
-  padding: 12px;
+  padding: 0 0 12px;
   border-bottom: 1px solid #ebeef5;
 }
+
 .menu {
   max-height: calc(100vh - 240px);
   overflow: auto;
+  border-right: 0;
 }
 .actions {
   margin-left: auto;