style: 统一页面按钮样式与尺寸

src/components/ReviewRecall.vue

@@ -374,7 +374,6 @@ onMounted(() => {
   <section class="recall-page">
     <!-- 顶部操作栏 -->
     <div class="page-header">
-      <el-button size="small" @click="router.back()">← 返回</el-button>
       <h2>回忆复习</h2>
       <el-button size="small" @click="loadHistory" v-if="!showHistory">
         历史记录
@@ -478,18 +477,16 @@ onMounted(() => {
         <div class="panel-actions">
           <el-button
             v-if="hasCompared"
-            size="small"
             type="success"
             @click="resetComparison"
           >
             返回完整导图
           </el-button>
-          <el-button size="small" @click="standardExpanded = !standardExpanded">
+          <el-button @click="standardExpanded = !standardExpanded">
             {{ standardExpanded ? "折叠" : "展开" }}
           </el-button>
           <el-button
             v-if="standardExpanded"
-            size="small"
             type="warning"
             :loading="regenerating"
             @click="handleRegenerate"
@@ -498,7 +495,6 @@ onMounted(() => {
           </el-button>
           <el-button
             v-if="standardExpanded && !editingStandard"
-            size="small"
             type="primary"
             @click="startEditStandard"
           >
@@ -612,9 +608,6 @@ onMounted(() => {
 
 .surface-card {
   padding: 20px 22px;
-  background: #fff;
-  border-radius: 8px;
-  border: 1px solid var(--border-soft, #e0e0e0);
 }
 
 .surface-card h3 {