refactor: move delete button to left side of NodeEditor header

editor/components/NodeEditor.vue

@@ -57,12 +57,15 @@ function onBlur() {
     <Transition name="slide-right">
       <div v-if="!store.nodeEditorCollapsed" class="ne-expanded">
         <div class="editor-header">
-          <h3>{{ scene ? scene.id : '全局配置' }}<span v-if="!scene && store.aiChanges?.globalFields?.length" class="global-diff-tag" :title="store.aiChanges.globalFields.join(', ')">● 已修改 {{ store.aiChanges.globalFields.length }} 字段</span></h3>
+          <div class="header-left">
+            <h3>{{ scene ? scene.id : '全局配置' }}</h3>
+            <button v-if="scene" class="icon-btn danger" @click="emit('deleteScene', scene.id)" title="删除场景">🗑</button>
+            <span v-if="!scene && store.aiChanges?.globalFields?.length" class="global-diff-tag" :title="store.aiChanges.globalFields.join(', ')">● 已修改 {{ store.aiChanges.globalFields.length }} 字段</span>
+          </div>
           <div class="header-actions">
             <span v-if="saved" class="saved-hint">已保存</span>
             <span v-if="errorMsg" class="error-hint">JSON 错误: {{ errorMsg }}</span>
             <button class="icon-btn" @click="store.nodeEditorCollapsed = true" title="折叠">▶</button>
-            <button v-if="scene" class="icon-btn danger" @click="emit('deleteScene', scene.id)" title="删除场景">🗑</button>
           </div>
         </div>
 
@@ -165,6 +168,13 @@ function onBlur() {
   color: #ddd;
 }
 
+.header-left {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  min-width: 0;
+}
+
 .header-actions {
   display: flex;
   align-items: center;