简化TabPage标签布局：使用tab-spacer元素占据中间空间，实现标题靠左显示、关闭按钮靠右显示

AutoRobot/Windows/Robot/Web/src/DockLayout/TabPage.vue

@@ -8,11 +8,8 @@
         :class="['tab-item', { 'active': activeTabIndex === index }]"
         @click="setActiveTab(index)"
       >
-        <div class="flex items-center justify-between w-full">
-          <div class="tab-title-container">
-            <span class="tab-title-text">{{ panel.title }}</span>
-          </div>
-          <div class="tab-buttons-container">
+        <span class="tab-title">{{ panel.title }}</span>
+        <span class="tab-spacer"></span>
         <button 
           class="button-icon p-[2px] rounded hover:opacity-100 opacity-80"
           @click.stop="closeTab(panel.id)"
@@ -24,8 +21,6 @@
           </svg>
         </button>
       </div>
-        </div>
-      </div>
       <div class="tab-placeholder"></div>
     </div>
     <!-- Tab页内容区域 -->
@@ -121,24 +116,18 @@ const closeTab = (tabId) => {
   width: fit-content;
 }
 
-.tab-title-container {
-  display: flex;
-  align-items: center;
-  flex: 1;
-  margin-right: 8px;
-}
-
-.tab-title-text {
+.tab-title {
   text-align: left;
   min-width: 0;
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;
+  margin-right: 8px;
 }
 
-.tab-buttons-container {
-  display: flex;
-  align-items: center;
+.tab-spacer {
+  flex: 1;
+  min-width: 0;
 }
 
 .tab-item.active {