移除TabPage标签页与Panel之间的边距：1. 移除tab-header底部边框；2. 移除tab-item底部边框；3. 在tab-content顶部添加边框并设置负上边距；4. 移除tab-placeholder底部边框

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

@@ -80,7 +80,7 @@ const closeTab = (tabId) => {
   flex-wrap: nowrap;
   height: 28px;
   background: #f0f0f0;
-  border-bottom: 1px solid #c7d2ea;
+  border-bottom: none;
   overflow-x: auto;
   overflow-y: hidden;
   padding-top: 2px;
@@ -95,7 +95,7 @@ const closeTab = (tabId) => {
   margin-left: 1px;
   background: linear-gradient(to bottom, var(--vs-blue-top), var(--vs-blue-bottom));
   border: 1px solid #c7d2ea;
-  border-bottom-color: #c7d2ea;
+  border-bottom: none;
   border-radius: 3px 3px 0 0;
   cursor: pointer;
   white-space: nowrap;
@@ -107,7 +107,7 @@ const closeTab = (tabId) => {
 .tab-item.active {
   background: #ffffff;
   border: 1px solid #c7d2ea;
-  border-bottom-color: #ffffff;
+  border-bottom: none;
   border-top-width: 2px;
   border-top-color: #0078d7;
   color: #333;
@@ -143,7 +143,7 @@ const closeTab = (tabId) => {
   height: 26px;
   margin-left: 1px;
   border: 1px solid transparent;
-  border-bottom-color: #c7d2ea;
+  border-bottom: none;
 }
 
 /* 内容区域样式 */
@@ -151,6 +151,8 @@ const closeTab = (tabId) => {
   flex: 1;
   position: relative;
   overflow: hidden;
+  border-top: 1px solid #c7d2ea;
+  margin-top: -1px;
 }
 
 .tab-panel {