优化TabPage标签布局，调整flex属性确保标题和关闭按钮正确对齐

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

@@ -112,12 +112,12 @@ const closeTab = (tabId) => {
   font-size: 12px;
   user-select: none;
   position: relative;
-  width: fit-content;
+  min-width: fit-content;
+  flex: 0 0 auto;
 }
 
 .tab-title {
   text-align: left;
-  flex: 1;
   min-width: 0;
   overflow: hidden;
   text-overflow: ellipsis;
@@ -144,7 +144,7 @@ const closeTab = (tabId) => {
 }
 
 .button-icon {
-  margin-left: auto;
+  margin-left: 8px;
   margin-right: -8px;
   background: transparent;
   border: none;