style: 移除编辑器内容区重复的标题显示

frontend/vue-demo/src/views/Editor.vue

@@ -92,14 +92,13 @@
       <!-- 中间编辑区 -->
       <div class="center-panel">
         <div class="editor-title-bar">
-          <h2>{{ reportTitle }}</h2>
           <div class="view-toggle">
             <el-radio-group v-model="viewMode" size="small">
               <el-radio-button label="edit">📝 编辑</el-radio-button>
               <el-radio-button label="preview">👁 预览</el-radio-button>
             </el-radio-group>
           </div>
-          <el-button :icon="Share" circle @click="showGraphModal = true" />
+          <el-button :icon="Share" circle @click="showGraphModal = true" title="知识图谱" />
         </div>
 
         <div class="editor-scroll" ref="editorRef">
@@ -1550,17 +1549,13 @@ onUnmounted(() => {
   overflow: hidden;
 
   .editor-title-bar {
-    padding: 16px 24px;
+    padding: 12px 24px;
     border-bottom: 1px solid var(--border);
     display: flex;
     align-items: center;
+    justify-content: space-between;
     gap: 12px;
-
-    h2 {
-      flex: 1;
-      font-size: 18px;
-      font-weight: 600;
-    }
+    background: var(--bg);
   }
 
   .editor-scroll {